Maxim IMA-540 - Unknown TeachLogic - Free user manual and instructions

USER MANUAL Maxim IMA-540 TeachLogic

Maxim ^TM (IMA-540)

Classroom Audio System

Installation Manual

TeachLogic | Maxim CH A CH B DVD COMPUTER AUX CONFERENCE CONFERENCE INPUT OUTPUT

Welcome

Congratulations on the purchase of your new TeachLogic® classroom audio system. You can be assured that this product fulfills all specifications and was produced to high quality control standards.

TeachLogic incorporates the latest state of the art technology, employs the most advanced manufacturing methodology and uses only premium quality components to assure many years of reliable performance. We appreciate your confidence by your selection of our product. It is TeachLogic's intent to uphold that confidence by providing factory assistance and reseller support. This manual will help you learn to use and gain the maximum benefit of the system.

We hope you will take the time to review this manual to familiarize yourself with the product operation and features.

TeachLogic, LLC

Longmont, Colorado USA

www.teachlogic.com

Safety Instructions

Read Instructions

All safety and operation instructions should be read before operating this TeachLogic product.

Retain Instructions

Safety and operating instructions should be kept for future reference.

Water & Moisture

This product should not be operated near water.

Heat Environment

Do not subject this product to excessive heat conditions.

Power Source

This product must be connected to an AC power source per the voltage input specified and marked on the power supply.

Do not insert any power cable not provided by the manufacturer into the product. Long prongs can penetrate inside electrical components or current charging conductors.

Certifications

TeachLogic systems are manufactured using lead-free processes and are free of materials harmful to the environment. They conform to European RoHS guidelines for consumer products.

Power Cord Caution

Power cable should be routed clear of foot traffic and supported clear of kinking or abrasion.

Object Protection

Locate the operating unit so it will not be subjected to falling objects or water entry. Do not drill hole in or screw objects into the product except as specified by manufacturer.

Internal Service

User should not attempt to service this product. All internal service must be accomplished by a qualified technician.

Electric Shock

Do not adapt or modify the AC power plug. Do not remove thus lifting the earth ground connection ( 3^rd prong) or use power supply without a connector to a 3-prong grounded outlet.

CAUTION

Recycle—Do not dispose rechargeable batteries in trash. It is unlawful to do so in numerous states. Go Green. Save our resources and do not contaminate.

Contact: Earth911.com 1-800-CLEANUP

CAUTION

RISK OF ELECTRIC SHOCK: DO NOT OPEN

Caution: To Reduce The Risk Of Electric Shock Do Not Remove Cover (Or Back) No User-serviceable Parts Inside Refer Servicing To Qualified Personne

System info

Date of Purchase

Model Number

Serial Number

Notes

Contact

If you should encounter an

unresolved issue, please contact

the TeachLogic customer service

department for further assistance.

760-631-7800 | [e-mail] | teachlogic.com

Limited warranty

For full warranty details refer to teachlogic.com/warranty.

Contents

System Overview....5

System Diagram 6

Installation....7

Installation Planning....7

Connection of Speakers....8-9

Installation of Ceiling Sensor....10

Integration ....11

Page Mute/Pass Through Integration....11-12

Fire Alarm Input 13

RS-232 Feature 15

Security Alert Feature 15-16

Configuration ....17

Final Setup....17

Power Button Lights | Standby Function....18

Troubleshooting 19

System Specifications....20-21

Front Panel

1. Power Button/ "TL" Indicator LED
2. Channel A Microphone Volume Control
3. Channel A Connectivity Indicator LED
4. Channel B Microphone Volume Control
5. Channel B Connectivity Indicator LED

6. DVD Input Volume Control

7. Computer Input Volume Control

8. Aux Input Volume Control
9. Video Conference Input Port (3.5 mm) (also suitable for Aux audio source)
10. Video Conference Output Volume Control
11. Video Conference Output Port (3.5 mm) (also suitable for Lesson Capture)

1 2 3 4 5 TeachLogic | Maxim CH A CH B DVD COMPUTER AUX CONFERENCE INPUT CONference OUTPUT 9 10 11 12

AMP A AMP B SPEAKER OUTPUT MIN 4Ω LOCK ON EACH AMP FIRE ALARM MUTE INPUT HA-Z INPUT 10V 25V 4V PAGE INPUT OUTPUT LUTING THRESHOLD, SELECT PAGE SYSTEM NON VOLTAGE SENSITIVITY ALS +5 dB -10 +10 -10 +10 -10 +10 -50 3 dB +5 dB +10 +10 +10 EQUALIZER 100 Hz 300 Hz 1 kHz 8 kHz TX GRID RX COM NVD NC RS-2322 SECURITY ALERT LEVEL MIC LINE AUX COMPUTER DVD INPUTS ANTI-HUM ON OFF SENSOR 5 VOLT OUTPUT POWER 19V DC 2.6A 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

Back Panel

1. Speaker Output
2. Fire Alarm Mute Input
3. Page Input
4. Page Sensitivity Control
5. Page Input Voltage Selector
6. ALS Output (3.5 mm) & Gain Control
7. Five Band Equalizer Controls

8. RS-232 Input & OFF/ON Switch

9. Security Alert Interface

10. Aux Input Port (3.5 mm) & Mic/Line Level Selector; Mic: -40 dB/Line: -10 dB
11. Computer Input Port (3.5 mm) / Computer Anti-Hum ON/OFF Switch
12. DVD Input Ports (Dual RCA, 0 dB)
13. Powered IR Ceiling Sensor Inputs (RCA x 2)
14. 5 Volt USB Output for chargers
15. Power Input: 19 VDC, 6.5 A

graph TD
    A["Classroom audio speakers"] --> B["Speaker OUTPUT<br>MIN 40/LOAD ON EACH AMP"]
    B --> C["Fire Alarm<br>MUTE INPUT"]
    C --> D["FIH2 INPUT 70V 25V 4V"]
    D --> E["RS-232 wall control panel"]
    E --> F["Intercom/paging speaker"]
    F --> G["Output to front office intercom panel via existing intercom cabling"]
    G --> H["Wall mounted call button"]
    H --> I["Intercom/paging system wall panel"]
    I --> J["Assistive listening device (3.5 mm analog output)"]
    J --> K["OUTPUT"]
    K --> L["TSI OND RX COM NO MIC"]
    L --> M["EQUALIZER"]
    M --> N["LEVEL MIC LINE AUX"]
    N --> O["COMPUTER"]
    O --> P["DVD"]
    P --> Q["SENSOR"]
    Q --> R["POWER 19V DC 6.5A"]
    R --> S["TeachLogic microphone charger"]
    S --> T["Personal music device"]
    T --> U["Lesson capture recorder"]
    U --> V["Output to front office intercom panel via existing intercom cabling"]
    V --> W["Alert! - Dry contact relay from fire panel<br>- Normally open position<br>- No voltage required"]
    W --> X["Ceiling sensor(s)"]
    X --> Y["TeachLogic Maxim CH A CH B"]

TeachLogic® Maxim™ (IMA-540) Wiring Diagram

The goal of a classroom audio system is to evenly distribute sound throughout the listening area.

Sound Field Area 65 dB 65 dB 65 dB

Component Placement

1. Amplifier: Choose location that supports accessibility requirements and wiring constraints for power, speakers, ceiling sensor, and audio devices connecting to the amplifier.
2. Ceiling Sensor: Locate in the center of the ceiling; maintain line of sight to teacher locations; keep away from direct sunlight and electrical interference.
3. Speakers: The Maxim™ can power 4 classroom speakers. Mark location for wall mount vs. ceiling mount and confirm wiring run to the amplifier. Ensure speakers evenly cover the listening area.
4. Integrations/Connections: Confirm location of other systems you plan to connect to the amplifier such as audio devices, flat screens, projectors, intercom connections, and fire alarm, noting how the wiring needs to run.
5. Charger: Confirm microphone charging location for daily use/charging.

Top-down view of a room layout with furniture and objects, no visible text or symbols

Speaker Location

Below are examples of room coverage for two and four speaker installations. For more than 4 speakers, space the next row(s) accordingly.

Ceiling Speakers: Locate and identify the center most tile in each quadrant.

Wall Speakers: First observe the shape of the room: ceiling height, door locations, windows, mounting surface, and seating area. Ordinary installation would be to locate the speakers on each side wall beginning at the front row of listeners, approximately 6–7 feet above the floor.

Front of Room Ceiling Sensor Ceiling Speakers Listening Area

Front of Room Receiver Amplifier Ceiling Sensor Wall Speakers

Front of Room Ceiling Sensor Ceiling Speakers Listening Area

graph TD
    A["Wall Speakers"] --> B["Ceiling Sensor"]
    B --> C["Receiver Amplifier"]
    C --> D["Front of Room"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333

Connection of speakers

The IMA-540 has two channels of amplified audio, rated for a minimum 4-ohm speaker load (two 8-ohm speakers each, connected in parallel provide 4 ohms impedance).

There is one blue phoenix style speaker connector on the back panel, providing two pairs of speaker terminals.

Wire in Parallel + - + - + + + - AMP A AMP + + SPEAKER OUTPUT MIN 4Ω LOAD ON EACH AMP FIRE ALARM MUTE INPUT HI-Z INPUT 70V 25V 4V PAGE INPUT MUTING THRESHOLD. SELECT PAGE SYSTEM NON. VOLTAGE SENSITIVITY OUTPUT +5 dB 0 +10 -10 +10 -10 100 Hz 300 Ω RS232 SWITCH OFF ON TX GND R RS232

Installation of Infrared (IR) Ceiling Sensor (ICS-55)

The ideal mounting location is in the center of the room's ceiling. The ideal installation is flush mounted on a white, reflective ceiling like suspended acoustic ceiling tiles. This will ensure 360° coverage and will minimize the transmission distance for more reliable performance.

For additional coverage, or in large rooms, a second IR sensor may be placed on ceiling or a wall and connected to the second sensor input. As many as three sensors may be powered by the amplifier (use a wye adapter for two of them to connect to one input). The max cable length is 100 ft.

Installation 1 – Attach to T-bar rail

Technical illustration showing a mechanical assembly before and after modification, with no visible text or symbols.

Installation 2 – Concrete or Drywall Surface

Technical diagram showing cable installation and wire connection for a suspended lamp, with labeled components and zoomed-in detail views.

Installation 3 – Wood Surface
FINAL STEP: Route sensor cable to amplifier and plug into one of the amplifier's two sensor inputs. An illuminated green LED will indicate that the sensor is receiving power from the amplifier.

Page Mute

System behavior for Page Mute

Page Muting causes the amplifier to silence the microphones and audio sources connected to the amplifier when a page signal is detected on the Page Input terminal. When muted, the only audio allowed to pass through is from the paging system, i.e. Page-Pass-Through Function (PPT).

The amplifier can integrate with constant voltage analog paging systems (70V and 25V) as well as low power VOIP amplifiers (as low as 1/8 watt).

PAGE INPUT MUTING THRESHOLD. SELECT PAGE SYSTEM NOM. VOLTAGE SENSITIVITY HI-Z INPUT 70V 25V 4V

Connecting the system:

Before connecting, the installer is responsible for determining that the TeachLogic amplifier impedance is compatible with the paging system.

1. Unplug the 2-pin green Phoenix connector.
2. Connect a cable from the paging system driving its speakers to the 2 pin Phoenix connector of the Page input.
3. Reconnect the 2-pin green Phoenix connector.
4. Determine the signal level of the paging system (4V, 25V, or 70V).
5. Set the Page Mute slide switch to the appropriate speaker level setting.
6. With the TeachLogic amplifier turned ON, send a page to test the mute function.
7. Adjust the sensitivity control to ensure the amplifier senses the page signal, noting that some pages with quiet voices will require greater sensitivity settings. The system will maintain its mute until about 11 seconds after the page signal falls below the threshold for sensing. Thereupon, the wireless mics are unmuted, and other audio levels are ramped up smoothly to their prior volume (before mute).

Table 1. Impedance of Page Input interface and Sensitivity for Page Mute function

Switch Position	Nominal Impedance /Power Draw	Maximum Sensitivity (minimum threshold for muting)	Minimum Sensitivity
4V	>50 kΩ / 0.01 W	50 mV	700 mV
25V	>50 kΩ / 0.01 W	500 mV	4.6 V
70V	>50 kΩ / 0.01 W	1.2 V	12.6 V

PAGE INPUT MUTING THRESHOLD. SELECT PAGE SYSTEM NOM. VOLTAGE SENSITIVITY HI-Z INPUT 70V 25V 4V

Page Pass Through

Page-Pass-Through is a feature that passes an audio paging signal through the amplifier and to the connected loudspeakers. This may be switched on or off by a side panel switch. See Table 2.

IMAPORTANT:

The system does not pass-through paging audio signal to the speakers when the amplifier is powered off (or no power is available).

PPT on ALS output

The amplifier routes the paging input signal by passing it through to the assistive listening system (ALS) output (and Conference Output) so that students using ALS products will hear broadcast paging announcements.

Table 2.

	SWITCH POSITION	LEFT SWITCH SECURITY ALERT:# OF PULSES	MIDDLE SWITCH PAGING PASS THROUGH TO SPEAKERS	RIGHT SWITCH CONFERENCE ECHO GUARD
SWITCHES ON LEFT SIDE OF DEVICE	UP	1	OFF	ON
VISIBLE BEHIND VENTILATION GRILL	DOWN	4	ON	OFF

Fire Alarm Mute Input

The 2-pin orange Phoenix connector labelled Fire Alarm Mute Input provides a connection to mute the TeachLogic amplifier.

SYSTEM BEHAVIOR

• When interfaced to the fire alarm panel relay contact output, all audio inputs (microphones, DVD, etc.) will MUTE.
• In the event of a fire, this will help to lower the overall decibel levels and help students and staff hear the audible fire alarm tones/ instruction within the classroom.
• Audio resumes at original volume 11 seconds after closure ceases being detected.

FIRE ALARM MUTE INPUT

CONNECTION

• This feature requires a contact closure from the Fire Alarm Panel and the TeachLogic terminal is for a normally open connection.
• Fire alarm system connects to a 2-pin Phoenix connector on back of amplifier.
• Refer to fire alarm system manual or manufacture's spec to confirm proper wire connection.

KEY SPECS

• Dry contact closure
• Normally open position
• No voltage required

RS-232 Control Feature

The RS-232 control feature allows the user to remotely adjust the volume (or gain) of all the audio sources connected to the amplifier. Such control may be exercised from a separate wall panel controller or other device. The third-party RS-232 device is connected via three wires to the back panel connector shown to the right: TX/Gnd/RX.

This allows the receiver/amplifier to be placed in an area or compartment that is not easily accessed by the user.

Codes that are required for this setup are available on the teachlogic/com/resources page under "Application Notes" or directly at https://TeachLogic.com/TeachLogic-app-notes-rs-232-control/.

Audio levels very often need to be adjusted when switching from computer audio to DVD players and other audio sources. Such operations as level UP, DOWN and MUTE are easily accomplished via a typical eight button controller. Shown here is a Cables To Go controller.

Connecting the control panel:

1. Connect the control panel wires to the provided 3-pin Phoenix connector.

2. Turn RS232 SWITCH to ON position. This will disable the function of the input volume/gain control knobs on the front of the amplifier.

100Hz 500Hz RS232 SWITCH TX 1 Gnd 2 RX 3 CO OFF ON RS232 S

DVD UP AUX UP POWER ON 1 2 VOL + 3 4 UP DOWN 5 6 A/V MUTE 7 8 ON OFF IN DVD DOWN AUX DOWN AUX MUTE POWES OFF

IMPORTANT

When any remote panel is connected, RS-232 switch must be in "ON" position.

When panel is not connected, RS-232 switch must be in "OFF" position for amplifier controls to function.

Anti-Hum Feature

The rear panel input port labeled "Computer" has a switchable feature to eliminate or reduce hum sounds often present when computers are connected to external amplifiers. The hum is known as a ground loop hum and may be present if the computer and amplifier have electrical grounding differences. The telltale characteristic is that it is 60 hertz (a somewhat low tone.) Inside the amplifier is a ground isolating balun that may reduce or eliminate the hum when switched ON. If not needed, it is getter the leave switched OFF as the sound quality for the connected device will be slightly better in this case.

INPUTS ANTI-HUM ON OFF AUX COMPUTER DVD

Security Alert Feature

The Security Alert feature allows a user with a TeachLogic wireless microphone to summon help or indicate to administration personnel of an urgent situation in the room of that user.

CONNECTION

- Uses wire from paging manufacturer's wall-mounted call button panel to connect to amplifier via 3-pin Phoenix connector: COM | NORMALLY OPEN | NORMALLY CLOSED

graph TD
    A["Controller"] --> B["CHA CHB"]
    B --> C["INT OUTPUT"]
    C --> D["1 2 3 COM NO NC"]
    D --> E["RS293 SECURITY ALERT"]
    E --> F["Monitor"]
    F --> G["User"]
    H["Push/Hold for 5 seconds"] --> I["Device Icon"]

SYSTEM BEHAVIOR

• When the Sapphire's "Priority" button is pushed/held for 5 seconds, it sends a signal to the ceiling sensor which passes through the amp to the security alert interface (an electric relay).
• The relay contacts opens or close (depending on the normal status) to pass the signal through the paging system as if the paging system's wall-mounted button was being pressed.
• The amplifier functions normally during the alert, e.g. there is no change to audio input/output volume change nor does the system produce any sound

Setting Security Alert pulses with slide switch

The pulse change can be made with a dedicated switch to select either 1-pulse or 4-pulse mode as required by different security systems. Reference the label on the bottom of the amplifier for the settings.

SWITCHES ON LEFT SIDE OF DEVICE VISIBLE BEHIND VENTILATION GRILL	SWITCH POSITION	LEFT SWITCH SECURITY ALERT:# OF PULSES	MIDDLE SWITCH PAGING PASS THROUGH TO SPEAKERS	RIGHT SWITCH CONFERENCE ECHO GUARD
	UP	1	OFF	ON
	DOWN	4	ON	OFF

Testing the Security Alert function

To test security alert, you will need an IRT-60 (Sapphire™) microphone.

1. Turn on an IRT-60 Sapphire microphone by holding the "TL" button until it illuminates.
2. Once the "TL" is illuminated solid blue, locate the "Priority" switch on the side of the microphone.
3. While looking at the amplifier's power button, press & hold the microphone's Priority button for 5 seconds after which time the amplifier's power button will rapidly flash green. There will be an audible clicking sound from the amplifier when flashing.

Close-up of a silver handheld electronic device with a black label and arrow pointing to its side (no readable text or symbols)

Final Setup

Now that the system is installed and connected, turn the system "ON" and test its performance.

The testing will be done using an IR (infrared) microphone (Sapphire™ or Handheld) to confirm good connectivity.

AMPLIFIER

• Connect power supply to amplifier, then plug into outlet.
• Turn the amplifier ON by pushing the power button. The "TL" illuminates solid blue when the amplifier is powered ON.
• Confirm there is power to the IR ceiling sensor: A green LED on edge of sensor should be illuminated that indicates it is receiving power.
• Set all gain/volume dials to mid scale (12 o'clock position)

IRT-60 (SAPPHIRE) MICROPHONE SETUP

• Confirm "Ch A" volume dial is at mid scale (12 o'clock position)
• Slide gain/volume control switch on Sapphire to "Normal" setting.
• Press and hold power mic button until the LED light illuminates.
• Observe Sapphire power LED. Solid blue indicates power is on and mic is transmitting.
• Observe amplifier Ch A indicator LED. It should be green, indicating a connection between the microphone and ceiling sensor.
• If using two IRT-60 microphones in the same room, one must be changed to channel B to avoid interference. Watch the how-to video on teachlogic.com/resources.

Note: Next steps should be performed with a second person as the listener

• Stand under or in front of a speaker.
• Hold the microphone with the top at your collarbone and observe the speaker volume in the room by speaking in a natural voice.
• Raise the volume on Ch A until feedback begins, then reduce volume to an acceptable level and until indications of feedback have stopped.
• Walk around the room while talking into microphone to confirm good connectivity and sound levels and lack of feedback under/in front of each speaker.

IRH-35 HANDHELD MICROPHONE SETUP

• Confirm "Ch B" volume control is set to mid-scale (12 o'clock position)
  • Power on microphone using ON/OFF switch.
• Observe LED above mic switch. Solid green indicates power is on and ready to use.
• Observe amplifier Ch B indicator LED. It should be green, indicating a connection between the microphone and IR ceiling sensor.
• Hold the microphone about 3 inches from the mouth, above chin level and perform voice test.
• Raise the volume on "Ch B" until feedback begins, then reduce volume to eliminate all feedback
• Walk around the room while talking into the microphone to confirm good connectivity and sound under/in front of each speaker without feedback.

Once complete, charge microphones so they are ready for use.

Power Button Operation

The main power button on the amplifier's front panel has multiple indications as shown in the table below.

Red, solid	Off state; power is still supplied to USB port on back panel used to charge microphones
Blue, solid On
Blue flashing	Page received and audio sources muted
Amber, solid	In Standby (or “Sleep”) mode. See below
Red, flashing	Muted by Fire Alarm Mute Input
Purple,	System in Ducked mode with all line inputs lowered in volume to allow microphones to be better heard. The Sapphire mic on Channel A can trigger this “Teacher Priority” mode with a press of its priority button (toggles mode on and off)
Green/Red flashing	Indications of Security Alert pulse mode (see section above)
Green Flashing	Security Alert activated

System Standby Function

Standby Mode is a feature that reduces power consumption after the amplifier has not been used to amplify audio signal for a period of two hours. After entering the automatic standby mode, the amplifier displays an amber light at power button.

Normal ON mode may be resumed by

1. speaking into a microphone that is on,
2. sending an audio signal into one of the line inputs *such as a projector or flat panel audio signal), or
3. pressing the power button once.

It may take a few seconds for the normal mode to resume after one of these actions is taken. A page signal can also “wake” the amplifier, but to hear the full first page of a morning, be sure to wake it first with one of the methods above since, or the initial several seconds may be missed if there are no other paging speakers provided to deliver the page audio.

Troubleshooting

Problem	Solution
System will not power “ON”	Verify AC power; the power button will illuminate Blue when turned ONCheck if system has been unplugged; reconnect to power outlet or use another device to ascertain power available at outletCheck circuit breakerCall maintenance for assistance
System is turned “ON” but there is no soundorSystem is in standby and does not “wake up”	Turn “ON” microphone/ transmitter; the “TL” power button will illuminate to solid Blue when turned ONIf the power button is illuminated red, the battery is lowEnsure the mic is not muted (blinking light on mic indicates it is muted)Ensure gain/volume control knob on amplifier/receiver is turned up to mid-scale (12 o’clock position)On amplifier/receiver, ensure a green LED is illuminated just below Ch A or Ch B knob (depending on the microphone used).If no LED is illuminated:Check the green LED on the ceiling sensorIf sensor LED is not lit:Sensor has been disconnected (check cable plug ends), orPower output to sensor has failed (Sensor or amplifier may need to be replaced)
Voice is distorted and/or signal drop-out occurs	Verify that the sensor is not being coveredVerify there is no obstruction between microphone and sensorEnsure there is no direct sunlight on sensorEnsure no other IR mics in room are turned onIf sensor is mounted on a dark surface or without a flush ceiling surface, reception can be hampered.

Maxim™ (IMA-540)

Amplifier Output Power	50 W RMS, 2 x 25 W channels
Receiver Input	Infrared FM, 2 wireless mic channels
Modulation	Wide-band FM
Reception Frequencies	Ch. A: 2.08 MHz | Ch. B: 2.54 MHz
Deviation	10 kHz Nominal, 25 kHz Maximum
De-emphasis	50 μs
Tone Key	32.768 kHz
Infrared Wavelength	850 nm
External Sensor Input	2, RCA, powered ports
Connectivity Coverage	1,600 sq ft per sensor, up to 2 sensors supported
Total Harmonic Distortion	<1% @ 1 kHz
Frequency Response	20 Hz - 20 kHz, ± 3 dB
Line Level Inputs	4: 1 x dual RCA, 3 x 3.5 mm
Anti-Hum Balun	Present on 1 Aux input for computer
Wired Mic Input	1 aux input switchable to mic input
Line Outputs	Conferencing: 3.5 mm with gain control - front panelAssistive Listening System: 3.5 mm with gain control - rear panel
Page Input	2-pin Phoenix; 4 V, 25 V or 70 V normal
Page Input Sensitivity	51 mV min
Security Alert	Contact Closure (COM, N/O, N/C)
Fire Alarm	Contact Closure by fire panel mutes audio
Output Impedance	Rated Load: 4Ω minimum impedance
Equalization	5-band, ±10 dB
S/N Ratio	65 dB
Speaker Connection	4-pin Phoenix Connectors
Charger Output	5 VDC, USB
Power Supply	19 VDC / 6.3 A CE, CSA and UL Listed
Dimensions	8 1/2" W x 1 3/4" H x 7 1/2" D
Weight	2 lb 6 oz

Power Supply (AC-36)

Type	Regulated Switching Power Supply, CE, CSA and UL listed
Input Voltage	100-240 volts AV, 47-63 Hz
Output Voltage	19 VDC, 3.43 A
Power Output	65 watts max

Sapphire (IRT-60) microphone/transmitter specs

Transmission Carrier	Infrared
Transmission Frequencies	2.08 MHz & 2.54 MHz
Channel Selection	Field Switchable
Transmitting Diodes	Six
Wavelength	850 nm
Modulation	FM Wide-Band
Frequency Response	100 Hz - 10 KHz
Pilotone Frequency	32.768 KHz
Peak Deviation	± 25 KHz
Dynamic Range	95.5 dB @ 2.8% THD
Operating Range	60 Ft. line of sight
Latency (mic to speakers)	0.87 ms
Battery Used	Lithium-ion polymer (3.7V / 620mAh)
Battery Life	8 hr/Charge
External Power Charger	5V DC Micro USB Connector
Transmission Angle	180° Conical
User Controls
Power (On/Off)	Press & Hold
Mute Switch (On/Off)	Momentary Press (blinks when muted)
Addt'l Mic Gain Control	Normal, -3dB, -6dB
Audio Source Vol./Gain	Increase, Decrease
Channel Select	(A or B) in battery compartment
External Mic/Aux Input	3.5 mm Line Level
Dimensions (H x W x D)	3.5" x 1.25" x 0.75"
Weight	1.4 oz including battery

Handheld (IRT-35) microphone/transmitter specs

Transmission Carrier	Infrared
Transmission Frequencies	2.08 MHz & 2.54 MHz
Channel Selection	Field Switchable
Transmitting Diodes	Ten
Wavelength	850 nm
Modulation	FM Wide-Band
Pilotone Frequency	32.768 KHz
Peak Deviation	± 25 KHz
Operating Range	50 ft. line of sight
Power Switch (Slide)	On/Off
Battery Charge Level (LED)	Green: Full | Orange: Medium | Red: Low
Battery Life	Approx. 7 Hr./Charge
Dimensions	2.125" dia. (Head), 1.4375" dia. (Body), 9.625" H
Weight	10.3 oz. w/ Battery

Abstract white line drawing on gray background with no text or symbols

TeachLogic™

541 Main St., Suite B, Longmont, CO 80501

TeachLogic.com | [e-mail] | 760-631-7800