STA200D - Receiver Monacor - Free user manual and instructions

Product type	Professional digital stereo amplifier
Brand	Monacor
Model	STA200D
Dimensions (W × H × D)	482 × 44 × 268 mm (1 rack unit)
Weight	5 kg
Power supply	230 V / 50 Hz, max consumption 350 VA
RMS output power	2 × 125 W (4 Ω), 2 × 75 W (8 Ω)
Max output power	300 W
Audio inputs	4 × RCA (INPUT 1-4), 1 × 3.5 mm jack (PLAYER)
Frequency response	20 – 20,000 Hz
Signal-to-noise ratio	> 100 dB (A-weighted)
Distortion rate	< 0.05 %
Attenuation (crosstalk)	> 56 dB
Recommended speaker impedance	4 Ω (min 4 Ω in parallel)
LED indicators	ON, PROTECT, OVERHEAT, CLIP
Protection	Protection circuit (short circuit, overheating, overvoltage)
Operating temperature	0 – 40 °C
Mounting	19" rack (1U) or tabletop
Maintenance and cleaning	Dry soft cloth, no chemicals
Safety	Do not open, avoid water and excessive heat, unplug if damaged
Repairability	Repair by specialized technician; replace with identical fuse
Included accessories	Power cord, rack mounting brackets

Frequently Asked Questions - STA200D Monacor

How to connect speakers to the STA200D?

Use the terminals (11) or Speakon® connectors (12). For a 4 Ω impedance, connect one speaker per channel. For 8 Ω, you can connect two speakers in parallel (one on each connector type). Observe polarity (+/-).

Why does the PROTECT LED light up?

The PROTECT LED indicates activation of the protection circuit. This can be due to a short circuit on a speaker output, overheating (OVERHEAT LED on), or mains overvoltage. Turn off the amplifier and check connections and ventilation.

What power can I expect from the STA200D?

In stereo, the RMS power is 2 × 125 W into 4 Ω and 2 × 75 W into 8 Ω. The maximum power is 300 W. Make sure your speakers can handle at least 125 W RMS (4 Ω) or 75 W RMS (8 Ω).

Can I use the STA200D outdoors?

No, the device is designed for indoor use only. Protect it from splashes, moisture, and excessive heat (ambient temperature 0-40 °C).

How to adjust the gain of the PLAYER input?

Use the GAIN control (2) located next to the PLAYER jack. This allows adjusting the input sensitivity between 90 mV and 1 V to compensate for level differences with other inputs.

What to do if the CLIP LED lights up?

The CLIP LED indicates amplifier overload. Immediately lower the volume using the LEFT and RIGHT controls (4 and 6) to avoid distortion and protect the speakers.

How to rack-mount the STA200D?

Screw the two provided mounting brackets onto the sides of the unit. You will need a height of 1U (44.45 mm) in the rack. Ensure sufficient ventilation to dissipate heat.

What types of cables should I use for the inputs?

For INPUT 1-4, use RCA cables (white for left, red for right). For the PLAYER input, use a 3.5 mm stereo jack cable.

How to clean the amplifier?

Use a dry, soft cloth. Never use chemicals, alcohol, or water. Unplug the device before cleaning.

What to do if a fuse blows?

Replace it with a fuse of the same type and rating. If the problem persists, have the device checked by a specialized technician. Never replace with a fuse of a different rating.

USER MANUAL STA200D Monacor

INPUT 1-4:....1V/23kΩ,Cinch

These instructions are intended for users without any specific technical knowledge. Please read these instructions carefully prior to operating the unit and keep them for later reference.

All operating elements and connections described can be found on the fold-out page 3.

1 Operating Elements and Connections

1 Input PLAYER (3.5 mm jack, stereo) with adjustable sensitivity
2 Control GAIN for the sensitivity of the input PLAYER
3 Input selector switches INPUT SELECT
4 Volume control LEFT for the left channel
5 LED indicators ON – amplifier switched on PROTECT – activation of protective circuit OVERHEAT – overheating of amplifier CLIP – overload of amplifier

6 Volume control RIGHT for the right channel

7 POWER switch

8 Mains jack for connection to a socket (230 V/ 50 Hz) via the mains cable provided

9 Support for the mains fuse Always replace a blown fuse by one of the same type.

10 Inputs 1 - 4 (RCA jacks)

11 Terminals for the speakers

12 Speaker jacks (Speakon ^® compatible)

Note: Connect 4 Ω speakers either to the terminals or to the speaker jacks. 8 Ω speakers may be operated at the terminals and at the speaker jacks at the same time.

2 Safety Notes

This unit corresponds to all relevant directives of the EU and is therefore marked with C.€

WARNING

The unit uses dangerous mains voltage. Leave servicing to skilled personnel only and do not insert anything into the air vents. In-expert handling may result in electric shock.

• The unit is suitable for indoor use only. Protect it against dripping water and splash water, high air humidity and heat (admissible ambient temperature range: 0–40°C).
• Do not place any vessel filled with liquid on the unit, e. g. a drinking glass.
• The heat generated inside the unit must be dissipated by air circulation; never cover the air vents of the housing.
• Do not operate the unit or immediately disconnect the mains plug from the socket
• if the unit or the mains cable is visibly damaged,
• if a defect might have occurred after the unit was dropped or suffered a similar accident,
• if malfunctions occur.
  In any case the unit must be repaired by skilled personnel.
• Never pull the mains cable to disconnect the mains plug from the socket, always seize the plug.
• For cleaning only use a dry, soft cloth; never use water or chemicals.
• No guarantee claims for the unit and no liability for any resulting personal damage or material damage will be accepted if the unit is used for other purposes than originally intended, if it is not correctly connected or operated, or if it is not repaired in an expert way.

If the unit is to be put out of operation definitively, take it to a local recycling plant for a disposal which is not harmful to the environment.

3 Applications

This digital stereo PA amplifier with a peak power of 300 W is specially designed, for example, for applications on stage and in discothèques. It allows connection of up to five audio units to be selected via input switches.

4 SettingUp/Installation

The amplifier is designed for installation into a rack (482 mm / 19"); however, it can also be used as a table-top unit. In order to ensure sufficient cooling, air must always be able to flow freely through all air vents.

4.1 Rack installation

For installation into a rack, screw the two mounting brackets provided to the left and right sides of the housing (fig. 3). In the rack, the amplifier requires a height of 1 RS (rack space = 44.45 mm).

The hot air given off by the amplifier must be dissipated from the rack; otherwise heat will accumulate in the rack which may not only damage the amplifier but also other units in the rack. In case of insufficient heat dissipation, install a ventilation unit (e.g. DPVEN-03) into the rack.

5 Connecting the Amplifier

Prior to making or changing any connections, switch off the amplifier and the units to be connected.

1) Connect the audio units (e.g. CD / MP3 player, mixer, radio) to the input jacks (1, 10). When using the RCA jacks (10), always connect the left channel to the white jack and the right channel to the red jack. The 3.5 mm jack (1) should be used for a unit with low output level or for units not permanently operated with the amplifier.
2) The highest output power is obtained when 4 speakers are connected. However, it is also possible to connect 8 speakers which will slightly reduce the output power. The

minimum RMS power capability of the speakers must be as follows:

4Ω speaker 125W

8 Ω speaker 75 W

Connect the speakers to the speaker jacks* (12) or to the terminals (11). When operating speakers at the speaker jacks and at the terminals at the same time, only use speakers with a minimum impedance of 8 Ω to prevent overload of the amplifier.

* Contact configuration of a plug, see fig. 2 After inserting a plug into the jack, turn it clockwise until it engages. To remove the plug, pull back the latch on the plug and turn the plug counter-clockwise.

When using the terminals, always connect the marked core of the speaker cables to a red terminal.

Different possibilities for connecting multiple speakers to one channel are shown in fig. 4 which also shows the minimum load of the speakers. When interconnecting multiple speakers, always observe the correct positive and negative connections and make sure that the total impedance is at least 4 .

3) Via the mains jack (8), connect the amplifier to a socket (230 V/ 50 Hz) using the mains cable provided.

6 Operation

Hint: To prevent switching noise, switch on the units connected to the amplifier before switching on the amplifier. After operation, switch off the amplifier before switching off the units connected.

1) Before switching on the amplifier for the first time, set the volume controls LEFT (4) and RIGHT (6) to zero to make sure that the volume will not be too high. Then switch on the amplifier with the POWER switch (7). The power LED ON (5) will light up.
2) Use the switches INPUT SELECT (3) to select the desired unit for reproduction. To prevent loud switching noise, turn down the volume when operating the switches.

3) Set the desired volume with the controls LEFT and RIGHT. In case of overload of the amplifier, the red LED CLIP (5) will light up. Turn back the control accordingly.

CAUTION

Never adjust the amplifier to a very high volume. Permanent high volumes may damage your hearing! Your ear will get accustomed to high volumes which do not seem to be that high after some time. Therefore, do not further increase a high volume after getting used to it.

4) If a unit has been connected to the 3.5 mm jack PLAYER (1), use the control GAIN (2) to set the input sensitivity. Thus, differences in volume will be balanced when switching over to a unit connected to the jacks INPUT 1 – 4 (10). When a unit with low output level is connected, the control can also be used to increase the input sensitivity in order to obtain the maximum output power.

7 Protective Circuit

To prevent damage to the amplifier, a protective circuit has been integrated. When the protective circuit has been activated, the amplifier will be muted and the LED PROTECT (5) will light up:

1. in case of a short circuit at a speaker output
2. in case of overheating of the amplifier (The LED OVERHEAT will also light up.)

When the LED PROTECT lights up, always switch off the amplifier and eliminate the fault.

Another protective circuit will switch off the amplifier when there is overvoltage in the mains voltage. When the mains voltage has returned to its standard value, the amplifier will be switched on again.

8 Specifications

RMS output power

Stereo 4Ω:....2 × 125 W

Stereo 8Ω:....2 × 75 W

Maximum output power: .. 300W

Inputs

INPUT 1-4:....1V/23 kΩ, RCA

PLAYER: 90 mV-1 V/46 kΩ, 3.5 mm jack

Frequency range: ..... 20 – 20 000 Hz

S/N ratio: .... > 100 dB (A-weighted)

Crosstalk attenuation: .... > 56 dB

THD: .... < 0.05 %

Power supply: 230V/50Hz

Power consumption: ..... 350VA max.

Ambient temperature: .... 0–40°C

Dimensions (W × H × D): . 482 × 44 × 268 mm, 1 RS (rack space)

Weight: 5 kg

Subject to technical modification.