AC40 - Receiver ROLAND - Free user manual and instructions

Frequently Asked Questions - AC40 ROLAND

USER MANUAL AC40 ROLAND

Exterior view of a gray cylindrical device labeled 'Roland' (no additional text or symbols visible)

ACOUSTIC GUITAR AMPLIFIER

ACOUSTIC CHORUS

AC-40

Owner's Manual

Bedienungsanleitung

Mode d'emploi

Manuale dell'utente

Manual del usuario

As the colours of the wires in the mains lead of this apparatus may not correspond with the coloured markings identifying the terminals in your plug, proceed as follows:

The wire which is coloured GREEN-AND-YELLOW must be connected to the terminal in the plug which is marked by the letter E or by the safety earth symbol ⊕ or coloured GREEN or GREEN-AND-YELLOW.

The wire which is coloured BLUE must be connected to the terminal which is marked with the letter N or coloured BLACK.

The wire which is coloured BROWN must be connected to the terminal which is marked with the letter L or coloured RED.

Exterior view of a gray cylindrical device labeled 'Roland' (no additional text or symbols visible)

Owner's Manual

ACOUSTIC GUITAR AMPLIFIER

ACOUSTIC CHORUS AC-40

A stereo acoustic guitar amp that faithfully reproduces the rich resonances of your instrument

• High-efficiency 35 W (17.5 W + 17.5 W) stereo power amp.
- Two custom 6.5 inch (16 cm) speakers deliver ideal sound for acoustic instruments.

Two-channel design lets you use a guitar simultaneously with a microphone or line source (p. 4)

• Flexibility to cover a wide range of uses, including a guitar duo or a singer/instrumentalist (p. 8).
• Chorus and reverb are provided for both the Guitar channel and the Mic/Line channel. You can adjust the effect depth individually for each channel.

Equipped with the input/output jacks you need for just about any situation (p. 5)

• AUX IN jack lets you connect your CD or digital audio player.
- You can connect the LINE OUT jacks to an external PA system, and use the AC-40 as a monitor during your live performance.
• The headphone jack is convenient for night-time practice or during a sound check.
- You can connect separately sold footswitches (BOSS FS-5U, FS-6) to the FOOT SW jack and use them to switch effects on/off with your foot.

Anti-feedback function (p. 7)

- Simply switch this on to automatically suppress acoustic feedback.

Before using this unit, carefully read the sections entitled "USING THE UNIT SAFELY" and "IMPORTANT NOTES" (p. 2; p. 3). These sections provide important information concerning the proper operation of the unit. Additionally, in order to feel assured that you have gained a good grasp of every feature of your new unit, read Owner's manual in its entirety. This manual should be saved and kept on hand as a convenient reference.

INSTRUCTIONS FOR THE PREVENTION OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS

About ⚠ WARNING and ⚠ CAUTION Notices

WARNING	Used for instructions intended to alert the user to the risk of death or severe injury should the unit be used improperly.
CAUTION	Used for instructions intended to alert the user to the risk of injury or material damage should the unit be used improperly.* Material damage refers to damage or other adverse effects caused with respect to the home and all its furnishings, as well to domestic animals or pets.

About the Symbols

	The △symbol alerts the user to important instructions or warnings. The specific meaning of the symbol is determined by the design contained within the triangle. In the case of the symbol at left, it is used for general cautions, warnings, or alerts to danger.
	The ⚙symbol alerts the user to items that must never be carried out (are forbidden). The specific thing that must not be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the unit must never be disassembled.
	The ⚗symbol alerts the user to things that must be carried out. The specific thing that must be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the power-cord plug must be unplugged from the outlet.

ALWAYS OBSERVE THE FOLLOWING

WARNING

Make sure that the power cord is grounded

Connect mains plug of this model to a mains socket outlet with a protective earthing connection.

To completely turn off power to the unit, pull out the plug from the outlet

Even with the power switch turned off, this unit is not completely separated from its main source of power. When the power needs to be completely turned off, turn off the power switch on the unit, then pull out the plug from the outlet. For this reason, the outlet into which you choose to connect the power cord's plug should be one that is within easy reach and readily accessible.

Do not disassemble or modify by yourself

Do not open (or modify in any way) the unit or its AC adaptor.

Do not repair or replace parts by yourself

Do not attempt to repair the unit, or replace parts within it (except when this manual provides specific instructions directing you to do so). Refer all servicing to your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the "Information"

Do not use or store in the following types of locations

• Subject to temperature extremes (e.g., direct sunlight in an enclosed vehicle, near a heating duct, on top of heat-generating equipment); or are
• Damp (e.g., baths, washrooms, on wet floors); or are
• Exposed to steam or smoke; or are
• Subject to salt exposure; or are
• Humid; or are
• Exposed to rain; or are
• Dusty or sandy; or are

- Subject to high levels of vibration and shakiness.

Do not place in an unstable location

Make sure you always have the unit placed so it is level and sure to remain stable. Never place it on stands that could wobble, or on inclined surfaces.

Use only the supplied AC adaptor and the correct voltage

Be sure to use only the AC adaptor supplied with the unit. Also, make sure the line voltage at the installation matches the input voltage specified on the AC adaptor's body. Other AC adaptors may use a different polarity, be designed for a different voltage, so result in damage, malfunction, or elect

WARNING

Use only the supplied power cord

Use only the attached power-supply cord. Also, the supplied power cord must not be used with any other device.

Do not bend the power cord or place heavy objects on it

Do not excessively twist or bend the power cord, nor place heavy objects on it. Doing so can damage the cord, producing severed elements and short circuits. Damaged cords are fire and shock hazards!

Avoid extended use at high volume

This unit, either alone or in combination with an amplifier and headphones or speakers, may be capable of producing sound levels that could cause permanent hearing loss. Do not operate for a long period of time at a high volume level, or at a level that is uncomfortable. If you experience any hearing loss or ringing in the ears, you should immediately stop using the unit, and consult an audiologist.

Don't allow foreign objects or liquids to enter unit; never place containers with liquid on unit

Do not place containers containing liquid (e.g., flower vases) on this product. Never allow foreign objects (e.g., flammable objects, coins, wires) or liquids (e.g., water or juice) to enter this product. Doing so may cause short circuits, faulty operation, or other malfunctions.

Turn off the unit if an abnormality or malfunction occurs

Immediately turn the unit off, remove the AC adaptor from the outlet, and request servicing by your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the "Information" page when:

• The AC adaptor, the power-supply cord, or the plug has been damaged; or
  • If smoke or unusual odor occurs; or
• Objects have fallen into, or liquid has been spilled onto the unit; or
• The unit has been exposed to rain (or otherwise has become wet); or
• The unit does not appear to operate normally or exhibits a marked change in performance.

Adults must provide supervision in places where children are present

Always make sure that an adult is on hand to provide supervision and guidance when using the unit in places where children are present.

WARNING

Do not drop or subject to strong impact

Protect the unit from strong impact. (Do not drop it!)

Do not share an outlet with an unreasonable number of other devices

Do not force the unit's power-supply cord to share an outlet with an unreasonable number of other devices. Be especially careful when using extension cords—the total power used by all devices you have connected to the extension cord's outlet must never be rated by power rating (watts/amperes) for the ex Excessive loads can cause the insulation to heat up and eventually melt through

Do not use overseas

Before using the unit in overseas, consult with your retailer, the nearest Roland Service Center, or an authorized Roland distributor, as listed on the "Information" page.

CAUTION

Place in a well ventilated location

The unit and the AC adaptor should be located so their location or position does not interfere with their proper ventilation.

When disconnecting an AC adaptor, grasp it by the plug

To prevent conductor damage, always grasp the AC adaptor by its plug when disconnecting it from this unit or from a power outlet.

Periodically clean the AC adaptor's plug

At regular intervals, you should unplug the AC adaptor and clean it by using a dry cloth to wipe all dust and other accumulations away from its prongs. Also, disconnect the power plug from the power outlet whenever the unit is to remain unused for an extended period of time. Any accumulation of dust between the power plug and the power outlet can result in poor insulation and lead to fire.

Manage cables for safety

Try to prevent cords and cables from becoming entangled. Also, all cords and cables should be placed so they are out of the reach of children.

Avoid climbing on top of the unit, or placing heavy objects on it

Never climb on top of, nor place heavy objects on the unit.

Do not connect or disconnect the AC adaptor with wet hands

Never handle the AC adaptor or its plugs with wet hands when plugging into, or unplugging from, an outlet or this unit.

CAUTION

Disconnect everything before moving the unit

Before moving the unit, disconnect the AC adaptor and all cords coming from external devices.

Unplug the AC adaptor from the outlet before cleaning

Before cleaning the unit, turn it off and unplug the AC adaptor from the outlet (p. 5).

CAUTION

If there is a possibility of lightning strike, disconnect the AC adaptor from the outlet

Whenever you suspect the possibility of lightning in your area, disconnect the AC adaptor from the outlet.

CAUTION

Take care so as not to get fingers pinched

When handling the following moving parts, take care so as not to get fingers, toes, etc., pinched. Whenever a child uses the unit, an adult should be on hand to provide supervision and guidance.

- Arm stand (p. 7)

IMPORTANT NOTES

Power Supply

• Do not connect this unit to same electrical outlet that is being used by an electrical appliance that is controlled by an inverter or a motor (such as a refrigerator, washing machine, microwave oven, or air conditioner). Depending on the way in which the electrical appliance is used, power supply noise may cause this unit to malfunction or may produce audible noise. If it is not practical to use a separate electrical outlet, connect a power supply noise filter between this unit and the electrical outlet.
• The AC adaptor will begin to generate heat after long hours of consecutive use. This is normal, and is not a cause for concern.
  • To prevent malfunction and equipment failure, always make sure to turn off the power on all your equipment before you make any connections.

Placement

• Using the unit near power amplifiers (or other equipment containing large power transformers) may induce hum. To alleviate the problem, change the orientation of this unit; or move it farther away from the source of interference.
• This device may interfere with radio and television reception. Do not use this device in the vicinity of such receivers.
• Noise may be produced if wireless communications devices, such as cell phones, are operated in the vicinity of this unit. Such noise could occur when receiving or initiating a call, or while conversing. Should you experience such problems, you should relocate such wireless devices so they are at a greater distance from this unit, or switch them off.
• Do not expose the unit to direct sunlight, place it near devices that radiate heat, leave it inside an enclosed vehicle, or otherwise subject it to temperature extremes. Also, do not allow lighting devices that normally are used while their light source is very close to the unit (such as a piano light), or powerful spotlights to shine upon the same area of the unit for extended periods of time. Excessive heat can deform or discolor the unit.

• When moved from one location to another where the temperature and/or humidity is very different, water droplets (condensation) may form inside the unit. Damage or malfunction may result if you attempt to use the unit in this condition. Therefore, before using the unit, you must allow it to stand for several hours, until the condensation has completely evaporated.

• Do not allow rubber, vinyl, or similar materials to remain on this unit for long periods of time. Such objects can discolor or otherwise harmfully affect the finish.

• Do not paste stickers, decals, or the like to this instrument. Peeling such matter off the instrument may damage the exterior finish.
• Depending on the material and temperature of the surface on which you place the unit, its rubber feet may discolor or mar the surface. You can place a piece of felt or cloth under the rubber feet to prevent this from happening. If you do so, please make sure that the unit will not slip or move accidentally.
• Do not place containers or anything else containing liquid on top of this unit. Also, whenever any liquid has been spilled on the surface of this unit, be sure to promptly wipe it away using a soft, dry cloth.

Maintenance

• For everyday cleaning wipe the unit with a soft, dry cloth or one that has been slightly dampened with water. To remove stubborn dirt, use a cloth impregnated with a mild, non-abrasive detergent. Afterwards, be sure to wipe the unit thoroughly with a soft, dry cloth.

- Never use benzine, thinners, alcohol or solvents of any kind, to avoid the possibility of discoloration and/or deformation.

Additional Precautions

• Use a reasonable amount of care when using the unit's buttons, sliders, or other controls; and when using its jacks and connectors. Rough handling can lead to malfunctions.
• When disconnecting all cables, grasp the connector itself—never pull on the cable. This way you will avoid causing shorts, or damage to the cable's internal elements.
• To avoid disturbing others nearby, try to keep the unit's volume at reasonable levels.
• When you need to transport the unit, package it in the box (including padding) that it came in, if possible. Otherwise, you will need to use equivalent packaging materials.

- Some connection cables contain resistors. Do not use cables that incorporate resistors for connecting to this unit. The use of such cables can cause the sound level to be extremely low, or impossible to hear. For information on cable specifications, contact the manufacturer of the cable.

- When deploying or retracting the arm stand, be careful so as not to get your fingers pinched between the movable part and the unit itself. In places where small children are present, make sure that an adult provides supervision and guidance.

Licence/Trademarks

• MMP (Moore Microprocessor Portfolio) refers to a patent portfolio concerned with microprocessor architecture, which was developed by Technology Properties Limited (TPL). Roland has licensed this technology from the TPL Group.
• Roland and BOSS are either registered trademarks or trademarks of Roland Corporation in the United States and/or other countries.
• Company names and product names appearing in this document are registered trademarks or trademarks of their respective owners.

Control Panel (Connecting Your Guitar/Microphone)

1 GUITAR CHANNEL 3 VOLUME BASS MIDDLE TREBLE CHORUS REVERS MASTER ACOUSTIC CHORUS AC-40 INPUT MIC/LINE CHANNEL INPUT VOLUME BASS MIDDLE TREBLE CHORUS REVERS ANTI-FEEDBACK XLR type TRS type Phone type 2 4

1 GUITAR CHANNEL

INPUT jack

Connect your guitar here.

[VOLUME] knob

This adjusts the volume of the guitar channel.

[BASS] knob

This adjusts the sound level of the low-frequency range.

[MIDDLE] knob

This adjusts the sound level of the mid-frequency range.

[TREBLE] knob

This adjusts the sound level of the high-frequency range.

[CHORUS] knob

This switches the type of chorus that is applied (p. 6).

[REVERB] knob

This adjusts the amount of reverb (p. 6).

2 MIC/LINE CHANNEL

INPUT jack

Connect your microphone or line-level device here.

You can use any one of three types of plugs (XLR, TRS, phone).

* If your guitar has a pickup as well as a built-in preamp, you can also connect it to the MIC/LINE CHANNEL.

Illustration of an acoustic guitar connected to a CD-ROM player interface (no text or symbols visible)

* This instrument is equipped with balanced (XLR/TRS) type jacks. Wiring diagrams for these jacks are shown below. Make connections after first checking the wiring diagrams of other equipment you intend to connect.

1: GND 2: HOT 3: COLD

HOT (TIP)

* Phantom power is not supplied.

[VOLUME] knob

This adjusts the volume of the mic/line channel. If you're using a microphone, set this to the MIC position.

[BASS] knob

This adjusts the sound level of the low-frequency range.

[MIDDLE] knob

This adjusts the sound level of the mid-frequency range.

[TREBLE] knob

This adjusts the sound level of the high-frequency range.

[CHORUS] knob

This switches the type of chorus that is applied (p. 6).

[REVERB] knob

This adjusts the amount of reverb (p. 6).

3

[MASTER] knob

This adjusts the overall volume.

* This knob does not affect LINE OUT.

4

[ANTI-FEEDBACK] switch

You can prevent acoustic feedback by turning this on (p. 7).

* When you turn this switch on, the feedback point will be detected automatically.

* The next time you turn on the power, the setting for the feedback point that was automatically detected will be reset.

5

POWER indicator

This will light if the power is on.

6

[POWER] switch

This turns the power on/off.

Jack Panel (Connecting Your Equipment)

NOTE

• To prevent malfunction and equipment failure, always turn down the volume, and turn off all the units before making any connections.
- When connection cables with resistors are used, the volume level of equipment connected to the inputs (GUITAR CHANNEL, MIC/LINE CHANNEL, AUX IN) may be low. If this happens, use connection cables that do not contain resistors.

7

DC IN jack

Connect the included AC adaptor here.

* You must use only the AC adaptor that is supplied with the AC-40.

Pure electrical circuit lines without any symbols

DC IN PHONES LINE OUT AUX IN FOOT SW USE COLD FOR 100 MACFINS ONLY R L/MONO LEVEL STEREO EFFECTS TOP LUMES BING STRESS Roland Corporation THIS CLA THE CALL GET APPRIT TOUTES BROLL TO DIGITAL APPARATE WITH AN INTERFERENCE CAUSEN H. NUMERIQUE DELL A CLA E. ENERGISE IN REGULATED P. IN CANOAL. ALL REQUIREMENTS OF EQUIPMENT REGULATIONS. I RESPECTS: OUR LE MATTERIAL. CE 225 THIS DEVICE IS SELECT TO MAX NOT CAUSE MUST ACCESS A INTERFERENCE

8

PHONES jack

Connect headphones equipped with a stereo mini-plug.

Close-up of a black headphones connected to a wall-mounted phone (no visible text or symbols)

9

LINE OUT jacks

You can connect your mixer or recorder here.

Connect to the L/MONO jack if you're outputting in mono.

LIME OUT

L/MORD

our mixer or ONO jack if you're .

* The [MASTER] knob does not affect the output from the LINE OUT jacks.

10

AUX IN jack/[LEVEL] knob

Use the stereo mini-cable to connect your CD player or digital audio player here.

Use the [LEVEL] knob to adjust the volume.

AUX IN LEVEL STEREO

* The chorus/reverb is not applied to AUX IN jack.

11

FOOT SW jack

If footswitches are connected, you'll be able to control the turn effects on/off using your foot.

* You'll need momentary-type footswitches (BOSS FS-5U or FS-6; sold separately).
- Chorus on/off and Reverb on/off operations apply in common to the GUITAR CHANNEL and the MIC/LINE CHANNEL.
- If the [CHORUS] switch is "OFF" or if the [REVERB] knob is at 0, you won't be able to turn chorus or reverb on/off by operating the footswitch.
- If you use a phone plug (mono) cable to connect only one footswitch, it will only turn chorus on/off.

graph TD
    A["BOSS FS-5U"] -->|Red (RNG)| B["REVERB on/off"]
    A -->|White (TIP)| C["CHORUS on/off"]
    D["BOSS FS-6"] -->|A B| E["REVERB on/off"]
    D -->|B| F["CHORUS on/off"]
    B --> G["Cable: Stereo 1/4" phone type x 2"]
    C --> H["Cable: Stereo 1/4" phone type"]

Set the polarity switch of the footswitches as shown in the illustration.

BOSS FS-5U

graph TD
    subgraph_MODE1["MODE/POLARITY switches"]
        B1["POLARITY"] --> B2["FS-SU (MOMENTARY)"]
        B2 --> B3["FS-SL (LATCH)"]
        B3 --> BOSS["BOSS FS-6"]
    end
    subgraph_MODE2["MODE"]
        A1["Polarity"] --> A2["FS-SU (MOMENTARY)"]
        A2 --> A3["FS-SL (LATCH)"]
        A3 --> BOSS
    end
    B1 --> BOSS
    A2 --> BOSS
    style BOSS fill:#f9f,stroke:#333,stroke-width:2px

Turning the Power On/Off

Once everything is properly connected (p. 4, p. 5), be sure to follow the procedure below to turn on their power. If you turn on equipment in the wrong order, you risk causing malfunction or equipment failure.

1. Make sure that the power to all equipment is turned off.
2. Set each of the AC-40's [VOLUME] knobs and the [MASTER] knob to 0.

INPUT VOLUME BASO MODELE TREBLE CHORUS REVEEM MASTER ACoustic CHORUS AC-40 INPUT VOLUME BASO MODELE TREBLE CHORUS REVEEM ANTI- FLEEDRACK POWER

1. Switch on the power to any external equipment connected to the AUX IN jack.
2. Switch on the AC-40's power.

GUTAR CHANNEL VOLUME BASIS MIDDLE TRAVEL CHORUS HSTARD MASTER ACOUSTIC CHORUS AC-40 BMC/LINE CHANNEL VOLUME BASIS MIDDLE TRAVEL CHORUS HSTARD ANTI-PEDBACK POWER

* This unit is equipped with a protection circuit. A brief interval (a few seconds) after turning the unit on is required before it will operate normally.

1. Switch on any equipment connected to the LINE OUT jacks.
2. When you want to turn the power off, minimize the volume on the AC-40 and all connected devices, and then turn off their power in the opposite order of that followed when turning them on.
   * Before turning the unit on/off, always be sure to turn the volume down. Even with the volume turned down, you might hear some sound when switching the unit on/off. However, this is normal and does not indicate a malfunction.

Using Effects

Chorus and reverb are provided for both the Guitar channel and the Mic/Line channel.

You can adjust the effect depth individually for each channel.

Applying Chorus

1. Set each channel's [CHORUS] switch to "WIDE" or "SPACE" position.

CHORUS WIDE SPACE OFF

WIDE	This is a stereo chorus that processes the three bands independently.By applying band-appropriate chorusing to each of the low, mid, and high-frequency bands, this effect creates a deep and spacious chorusing that is appropriate for the sound of an acoustic guitar.The low range remains firmly localized in the center, and the sound will become more spacious as you go from the mid to the high range.
SPACE	This is a chorus that mixes the sounds in the air, a method that is possible only with a stereo system. On the AC-40, the effect sound is emitted by the right speaker (as you face the unit), and the direct sound is emitted by the left speaker. The chorus effect is produced as the sound from the left and right speakers is mixed in the air.Compared to an electrically mixed chorus effect, this effect has a broader left/right spread and a more natural-sounding spaciousness.
OFF No chorus effect will be applied.

* If the [CHORUS] switch is "OFF," you won't be able to turn chorus on/off by operating the footswitch.

Applying Reverb

This is a stereo reverb that was developed specifically for acoustic instruments and produces a spacious and natural sound.

1. Use the [REVERB] knob to adjust the depth.

* If the [REVERB] knob is at 0, you won't be able to turn reverb on/off by operating the footswitch.

Using the Anti-Feedback Function

What is acoustic feedback?

This is an unpleasant oscillation (a whine, buzz, or howl) that occurs when the output from a speaker is re-input to a microphone or pickup, amplified, and output again from the speaker.

This is more likely to occur when you point the microphone at a speaker or raise the volume to a high level.

graph TD
    A["Music Icon"] --> B["Speaker"]
    B --> C["Audio Device"]
    C --> D["Audio System"]
    D --> E["Feedback to Sound Continues Cycling"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333

What is the anti-feedback function?

This function suppresses the acoustic feedback that can occur between a guitar or microphone and the amp. It does this by attenuating the sound in the frequency range at which feedback is occurring.

Feedback will be suppressed automatically when you use the anti-feedback function.

1. Turn the [ANTI-FEEDBACK] switch "ON."

ANTI- FEEDBACK ON OFF

When you turn the switch "ON," the feedback point (frequency) will be detected automatically.

The anti-feedback function will be applied to the microphone or guitar connected to the GUITAR CHANNEL and MIC/LINE CHANNEL inputs.

MEMO

In order to prevent feedback from occurring during your performance, we recommend that you turn the anti-feedback function ON before you begin performing.

NOTE

* The next time you turn on the power, the setting for the feedback point that was automatically detected will be reset.
* If the anti-feedback function is not enough to suppress feedback, take the following steps.

• Change the direction of the guitar or microphone
• Move the guitar or microphone away from the speakers
• Lower the volume

Using the Arm Stand

When using the AC-40 at a low position such as on the floor, extending the arm stand will make the sound from the speakers easier to hear.

Simple line drawing of a rectangular frame with mounting feet and a handle (no text or symbols)

Arm stand

NOTE

* When using the arm stand, please observe the following points.

• You must place the AC-40 on a horizontal surface.
• Do not place objects on the AC-40, or sit or stand on the AC-40.
• Do not lift or carry the AC-40 by grasping its arm stand.

* Fold the arm stand if you're not using it.

* When deploying or retracting the arm stand, be careful so as not to get your fingers pinched between the movable part and the unit itself. In places where small children are present, make sure that an adult provides supervision and guidance.

Singer/Performer

You can sing while playing your guitar.

• Connect your guitar to the GUITAR CHANNEL.
• Connect your microphone to the MIC/LINE CHANNEL.

Diagram showing acoustic guitar setup with microphone and guitar connections to audio output

Miking Your Instrument

You can use a microphone to input sound from an instrument that is not equipped with a pickup.

• Connect your microphone to the MIC/LINE CHANNEL.
• Point the microphone toward the instrument.

Microphone

* The AC-40 is not equipped to provide phantom power, so condenser microphones that require phantom power cannot be used.

Guitar Duo

Here's how two guitarists can perform.

• Connect one guitar to the GUITAR CHANNEL.
• Connect the other guitar (with a built-in preamp) to the MIC/LINE CHANNEL.

One Guitar The Other Guitar

Blending Sound from Two Types of Pickups

If your guitar has two types of pickups, you can use the AC-40 to mix their outputs.

• Connect the pickup attached to the sound hole of your guitar to the GUITAR CHANNEL input.
• Connect the pickup (with internal preamp) built into your guitar to the MIC/LINE CHANNEL input.

Built-in pickup (with preamp) Separately attached pickup Separately attached pickup Built-in pickup

Troubleshooting

If the system does not work as you expect, check the following points first.

Problem Items to check Action Page
Power won't turn on Is the specified AC adaptor connected correctly?		Check the connection once again. Never use any AC adaptor other than the specified model.	p.5
No sound/Insufficient volume	Are connections with other devices correct? Check the connections again.
	Could headphones be connected?	If headphones are connected, no sound will be produced from the unit's speakers.
	Is the [MASTER] knob set appropriately?	Adjust the volume appropriately.	p.4
	Are the each channel's [VOLUME] knob set appropriately?
	Is the AUX IN [LEVEL] knob set appropriately? p. 5
	Could you have connected a condenser microphone that requires a phantom power supply?	The AC-40 is not equipped to provide phantom power, so condenser microphones that require phantom power cannot be used.	-
Sound is distorted Could each channel's [VOLUME] knob be raised excessively?		Turn each channel's [VOLUME] knob toward the left to adjust the volume appropriately.	p.4
The volume level of the device connected to INPUT jacks or AUX IN jack is too low	Could you be using a connection cable that contains a resistor?	Use a connection cable that does not contain a resistor.	-
Chorus or Reverb not applied	Could the [CHORUS] switch be turned off?	Set each channel's [CHORUS] switch to "WIDE" or "SPACE" position.	p.6
	Isn't the [REVERB] knob set to 0?	Turn each channel's [REVERB] knob toward the right to adjust the reverb level.
	Could you have used a footswitch to turn off the chorus or reverb?	Operate the footswitch to turn chorus/reverb on.	p.5
	The chorus and reverb cannot be applied to AUX IN.		-

Block Diagram

graph LR
    A["GUITAR INPUT"] --> B["GUITAR CHANNEL"]
    C["MIC/LINE INPUT"] --> D["MIC/LINE CHANNEL"]
    E["AUX IN (STEREO)"] --> F["LEVEL"]
    B --> G["VOLUME BASS MIDDLE TREBLE"]
    D --> H["VOLUME BASS MIDDLE TREBLE"]
    I["CHORUS REVERB"] --> J["STEREO EFFECTS"]
    K["CHORUS REVERB"] --> J
    J --> L["+"]
    L --> M["ANTI-FEEDBACK"]
    M --> N["VOLUME"]
    N --> O["MUTE"]
    O --> P["L"]
    P --> Q["POWER AMP"]
    Q --> R["SPEAKER L"]
    P --> S["POWER AMP"]
    S --> T["SPEAKER R"]
    U["R"] --> V["PHONES (STEREO)"]
    V --> W["LINE OUT L/R"]
    X["CHORUS ON/OFF"] --> Y["FOOT SW EFFECTS"]
    Z["REVERB ON/OFF"] --> Y

Roland AC-40: ACOUSTIC GUITAR AMPLIFIER

Rated Power Output 35 W (17.5 W + 17.5 W)
Nominal Input Level (1 kHz)	GUITAR CHANNEL: -10 dBuMIC/LINE CHANNEL: -50 dBu/-20 dBuAUX IN: -10 dBu
Nominal Output Level (1 kHz) LINE OUT:	10 dBu
Speakers 16 cm (6.5 inches) x 2
Controls	GUITAR CHANNEL: VOLUME knob, BASS knob, MIDDLE knob, TREBLE knob, CHORUS switch (OFF, SPACE, WIDE), REVERB knob
	MIC/LINE CHANNEL: VOLUME knob, BASS knob, MIDDLE knob, TREBLE knob, CHORUS switch (OFF, SPACE, WIDE), REVERB knob
	ANTI-FEEDBACK: ON/OFF switch
	AUX IN: LEVEL knob
	Others: MASTER knob, POWER switch
Indicator POWER
Connectors	GUITAR CHANNEL INPUT jack: 1/4" phone type
	MIC/LINE CHANNEL INPUT jack: XLR type, 1/4" TRS phone type
	AUX IN jack: Stereo miniature phone type
	LINE OUT (L/MONO, R) jacks: 1/4" phone type
	PHONES jack: Stereo miniature phone type
	FOOT SW jack: 1/4" TRS phone type
	DC IN jack
Power Supply	AC Adaptor
Current Draw	480 mA
Dimensions	362 (W) x 241 (D) x 265 (H) mm14-1/4 (W) x 9-1/2 (D) x 10-7/16 (H) inches
Weight	5.3 kg11 lbs 11 oz
Accessories	Owner's Manual, AC adaptor, Power Cord
Options (sold separately)	Footswitch: BOSS FS-5U, FS-6

* 0 dBu=0.775 Vrms
* In the interest of product improvement, the specifications and/or appearance of this unit are subject to change without prior notice.

Exterior view of a gray cylindrical device labeled 'Roland' (no additional text or symbols visible)

Bedienungsanleitung

AKUSTIKGITARREN-VERSTÄRKER

ACOUSTIC CHORUS AC-40

USING THE UNIT SAFELY

INSTRUCTIONS FOR THE PREVENTION OF FIRE, ELECTRIC SHOCK, OR INJURY TO PERSONS

About ⚠ WARNING and ⚠ CAUTION Notices

WARNING	Used for instructions intended to alert the user to the risk of death or severe injury should the unit be used improperly.
CAUTION	Used for instructions intended to alert the user to the risk of injury or material damage should the unit be used improperly.* Material damage refers to damage or other adverse effects caused with respect to the home and all its furnishings, as well to domestic animals or pets.

! WARNING

	The △symbol alerts the user to important instructions or warnings. The specific meaning of the symbol is determined by the design contained within the triangle. In the case of the symbol at left, it is used for general cautions, warnings, or alerts to danger.
	The ⬇symbol alerts the user to items that must never be carried out (are forbidden). The specific thing that must not be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the unit must never be disassembled.
	The ●symbol alerts the user to things that must be carried out. The specific thing that must be done is indicated by the design contained within the circle. In the case of the symbol at left, it means that the power-cord

! WARNING

Take care so as not to get fingers pinched

When handling the following moving parts, take care so as not to get fingers, toes, etc., pinched. Whenever a child uses the unit, an adult should be on hand to provide supervision and guidance.

- Arm stand (S. 7)

WICHTIGE HINWEISE

Stromversorgung

Illustration of an acoustic guitar connected to a speaker with an audio jack (no text or symbols visible)

Audio headset connected to a phone via cable (no visible text or symbols)

9
LINE OUT-Buchsen

Pure electrical circuit lines without any symbols

AUX IN LEVEL STERED

Exterior view of a gray cylindrical device labeled 'Roland' (no other text or symbols visible)

Mode d'emploi

AMPLIFICATEUR POUR GUITARE ACOUSTIQUE

ACOUSTIC CHORUS AC-40

Fonction anti-Larsen (p. 7)

• Pied pliant (p. 7)

REMARQUES IMPORTANTES

Alimentation

Diagram showing an acoustic guitar connected to a digital audio interface (no text or symbols present)

Close-up of a headset connected to a smartphone labeled 'PROMES' (no visible text on device or headset)

Simple line drawing of a rectangular frame with mounting feet and a handle (no text or symbols)

Pied pliant

REMARQUE

Diagram showing acoustic guitar setup with microphone, guitar, and audio output via micro audio

Exterior view of a gray cylindrical device labeled 'Roland' (no additional text or symbols visible)

Manuale dell'utente

AMPLIFICATORE PER CHITARRA ACUSTICA

ACOUSTIC CHORUS AC-40

Electric guitar connected to a USB output port (no visible text or symbols)

DC IN PHONES LINE OUT AUX IN FOOT SW USE SING FOR 100 MAINTIN MILE R L/MONO LEVEL STEREO EFFECTS THE STORMS MINIC REVEED Roland Corporation THIS OUT THE CARS GET APPURT TOUTES BRIDGE TO BREADS ON CANOVA. THIS EQUIPMENT OF SERVICE REGULATIONS IS RESPECTE. OUR LE MATERMEL CE 225 THIS DEVICE CO IS SUBJECT TO MAX NOT CAUSE MAKE ACCESS A INTERFERENCE

8

Jack PHONES

Collegate qui le cuffie dotate di cavo con mini jack stereo.

Close-up of a headset connected to a smartphone via a USB cable (no visible text or symbols)

9

Jack LINE OUT

AUX IN LEVEL STERED

Simple line drawing of a tilted rectangular object with a base and mounting feet, resting on a horizontal surface (no text or symbols)

Supporto a braccio

NOTA

Exterior view of a gray cylindrical device labeled 'Roland' (no additional text or symbols visible)

Manual del usuario

AMPLIFICADOR DE GUITARRA ACÚSTICA

ACOUSTIC CHORUS AC-40

Diagram showing an acoustic guitar connected to a digital audio amplifier (no text or symbols present)

Pure electrical circuit lines without any symbols

DC IN PHONES LINE OUT AUX IN FOOT SW USE COLD FOR 100 MACFINS ONLY R L/MONO LEVEL STEREO EFFECTS THE LUMES BING STRESS Roland Corporation THIS CLA THE CLA GET APPORT TUGHTS BROCCOL TO DIGITAL APPARATE MED AN INTERFERENCE-CAUSE H. MUNERIQUE DELL A CLA EQUISSES ON RELOVED ON CANADA. ALL REQUIREMENTS OF EQUIPMENT REGULATIONS N RESPECTS: OUR LE WATTEL CE 225 THIS DEVICE IS SUBJECT TO MAX NOT CAUSE MUST ACCEPT A INTERFERENCE

8

Conector PHONES

Audio headset connected to a smartphone labeled 'PHONES' (no visible text or symbols on device body)

9

Conectores LINE OUT

Exterior view of a gray cylindrical device labeled 'Roland' (no additional text or symbols visible)

Diagram showing an acoustic guitar connected to a digital audio jack (no text or symbols present)

DC IN PHONES LINE OUT AUX IN FOOT SW USE COLD FOR 100 MACFINS ONLY R L/MONO LEVEL STEREO EFFECTS TOP LUMES BING STREWS Roland Corporation THIS CLA THE CALL GET APPR TUGHTS BROCCOL TO DIGITAL APPARATE MED AN INTERFERENCE-CAUSE H. MUNERIQUE DELL A CLA E REQUES ON RELOVED ON CANADA. ALL REQUIREMENTS OF EQUIPMENT REGULATIONS IS RESPECTS. OUR LE WATTEL CE 225 THIS DEVICE IS SUBJECT TO MAX NOT CAUSE MINIST ACCESS A INTERFERENCE

8

Plugue PHONES

Conecte fones de ouvido equipados com um miniplugue estéreo.

Audio headset connected to a smartphone via a USB cable (no visible text or symbols)

9

Plugues LINE OUT

Simple line drawing of a square frame with mounting feet and a handle (no text or symbols)

Exterior view of a gray industrial device labeled 'Roland' (no other text or symbols visible)

Black guitar with a microphone connected to an audio jack (no visible text or symbols)

DC IN PHONES LINE OUT AUX IN FOOT SW USE SING AND FOR-OUT MAINT FOR ALL R L/MONO LEVEL STEREO EFFECTS THE STORIES MORE FEETERS Roland Corporation THIS OUT THE CNT OBT APPR TOUTES BROCOLL 10 DIGITAL APPARATUS AND IN REFERENCE CAUER I NUMERIQUE DE LA CLAY COSMENS ON RELLIMED P BY CANADA. ALL REQUIREMENTS OF EQUIPMENT REGULATIONS. I RESPECTE: OUR LE MATERIAL. CE 225 THIS DEVICE CO IS SUBJECT TO MAX NOT CAUSE MOST ACCESS AT INTERFERENCE

8

PHONES-aansluiting

Audio headset connected to a microphone via a USB cable (no visible text or symbols)

9

POLARITY-schakelaar

BOSS FS-5U

MODE/POLARITY-schakelaars

B POLARITY MODE FS-SU (MOMENTARY) FS-SL (LATCH) A POLARITY MODE FS-SU (MOMENTARY) FS-SL (LATCH) BOSS FS-6

BOSS FS-5U BOSS FS-6f

When you need repair service, call your nearest Roland Service Center or authorized Roland distributor in your country as shown below.

AFRICA

EGYPT

Al Fanny Trading Offi ce

9, EBN Hagar Al Askalany Street,

ARD E1 Golf, Heliopolis,

Cairo 11341, EGYPT

TEL:[phone]

REUNION

MARCEL FO-YAM Sarl

Royal Cape Park, Unit 24

Londonderry Road, Ottery 7800

Cape Town, SOUTH AFRICA

TEL:[phone]

ASIA

CHINA

Roland Shanghai Electronics

Co., Ltd.

5F. No.1500 Pingliang Road

Shanghai 200090, CHINA

TEL:[phone]

Roland Shanghai Electronics

Co., Ltd. (BEIJING OFFICE)

3F, Soluxe Fortune Building

63 West Dawang Road, Chaoyang

District, Beijing, CHN

TEL [phone]

HONG KONG

Tom Lee Music

11/F Silvercord Tower 1

30 Canton Rd

Tsimshatsui, Kowloon,

HONG KONG

TEL:[phone]

Parsons Music Ltd.

8th Floor, Railway Plaza, 39

Chatham Road South, I.S.I.

Kowloon, HONG KONG

TEL:[phone]

INDIA

Rivera Digitec (India) Pvt. Ltd.

411, Nirman Kendra Mahalaxmi

Flats Compound Off. Dr. Edwin

Moses Road, Mumbai 400011,

INDIA

TEL:[phone]

INDONESIA

PT. Citra Intirama

Ruko Garden Shopping Arcade

Unit 8 CR, Podomoro City

J.Letjend.S.Paman Kav.28

Jakarta Barat 11470, INDONESIA

TEL:[phone]

KAZAKHSTAN

Alatau Dybystary

141 Abylai-Khan ave, 1st floor

US0000 Almaty, KAZAKHSTAN

TEL:[phone]

FAX: [phone]

KOREA

Cosmos Corporation

1461-9, Seocho-Dong,

Seocho Ku, Seoul, KOREA

TEL:[phone]

MALAYSIA/

SINGAPORE

Roland Asia Pacific Sdn. Bhd.

45-1, Block C2, Jalan PJU 1/39,

Dataran Prima, 47301 Petaling

Jaya, Selangor, MALAYSIA

TEL:[phone]

PHILIPPINES

G.A. Yupangco & Co. Inc.

339 Gil J. Puyat Avenue

Makati, Metro Manila 1200,

PHILIPPINES

TEL:[phone]

TAIWAN

ROLAND TAIWAN ENTERPRISE

CO., LTD.

9F-5, No. 112 Chung Shan

North Road Sec. 2 Taipei 104,

TAIWAN R.O.C.

TEL:[phone]

THAILAND

Theera Music Co., Ltd.

100-108 Soi Verng Nakornkasem,

New Road, Sumpantawong,

Bangkok 10100, II

TEL: [phone]

VIET NAM

VIET THUONG CORPORATION

386 CACH MANG THANG TAM ST.

DIST.3, HO CHI MINH CITY,

VIETNAM

TEL:[phone]

OCEANIA

AUSTRALIA/

NEW ZEALAND

Roland Corporation

Australia Pty., Ltd.

38 Campbell Avenue

Dee Why West. NSW 2099,

AUSTRALIA

For Australia

TEL:[phone]

For New Zealand

TEL:[phone]

CENTRAL/LATIN AMERICA

ARGENTINA

Instrumentos Musicales S.A.

Av.Santa Fe 2055

(1123) Buenos Aires, ARGENTINA

TEL:[phone]

BARBADOS

A&B Music Supplies LTD

12 Webster Industrial Park

Wildey, St.Michael, BARBADOS

TEL:[phone]

BRAZIL

Roland Brasil Ltda.

Rua San Jose, 211

Parque Industrial San Jose

Cotla - Sao Paulo - SP, BRAZIL

TEL:[phone]

CHILE

Comercial Fancy II S.A.

Rut: 96.919.420-1

Nataniel Cox #739, 4th Floor

Santiago - Centro, CHILE

TEL:[phone]

COLOMBIA

Centro Musical Ltda.

Cra 43 B No 25 A 41 Bododega 9

Medellin, COLOMBIA

TEL:[phone]

COSTA RICA

JUAN Bansbach Instrumentos

Musicales

Ave.1. Calle 11, Apartado 10237,

San Jose, COSTA RICA

TEL:[phone]

CURACAO

Zeelandia Music Center Inc.

Orionweg 30

Curacao, Netherland Antilles

TEL:[phone]

DOMINICAN REPUBLIC

Instrumentos Fernando Giraldez

Calle Roberto Pastoriza #325

Sanchez Naco

Santo Domingo,

DOMINICAN REPUBLIC TEL: [phone]

TEL: [phone]

ECUADOR

Mas Musika

Boulevard Andrews, Albrook,

Panama City, REP. DE PANAMA

TEL:[phone]

PARAGUAY

E2 Calmount Park, Calmount

Avenue, Dublin 12,

Republic of TRELA

TEL: [phone]

ITALY

Roland Italy S. p. A.

This symbol indicates that in EU countries, this product must be collected separately from household waste, as defined in each region. Products bearing this symbol must not be discarded together with household waste.

This product complies with the requirements of EMC Directive 2004/108/EC.

For the USA

FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFERENCE STATEMENT

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

– Reorient or relocate the receiving antenna.
— Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions:

(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that may cause undesired operation.

This equipment requires shielded interface cables in order to meet FCC class B limit.

Any unauthorized changes or modifications not expressly approved by the party responsible for compliance could void the user's authority to operate the equipment.

For Canada

NOTICE

This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.

AVIS

This product contains chemicals known to cause cancer, birth defects and other reproductive harm, including lead.

Roland