A classroom Sound Field System is essentially a small public address (PA) sound system, designed for the confines of a typical classroom–approximately 1000 sq ft. These systems are engineered to maximize intelligibility of the educator’s voice as well as all audio sources connected through it such as TVs, touch boards, projectors, and computers.

Sound Field vs. Sound Amplification/Reinforcement:

From a hardware standpoint, these systems are similar and therefore often confused as being equal.  Both require an amplifier, receiver (for audio inputs), and overhead speakers (ceiling or wall mount). However, classroom Sound Field systems are different in two important ways:

1. They use multiple overhead speakers (ideally 4 in-ceiling speakers for up to 1600 sq ft) to evenly distribute the sound throughout the entire listening area. One speaker is like having one light in the classroom. It’s bright at the source, but not enough the fill the room. Just like it would be hard for all students to see equally well with one light, it’s hard for them to hear equally well with one speaker source.
2. Because a Sound Field system distributes all audio, a microphone for teachers is crucial. The teacher’s voice is also one source. It’s not that their voice isn’t loud enough. It simply falls victim to classroom noise (HVAC, outside activity, clicking. coughing, etc), reverberation, and direction, i.e. when the teacher turns away from any student. A microphone enables a teacher to use their natural voice without the need to project and they can move anywhere in the classroom and the students hear the same.

How loud does audio need to be?

More than 50 studies have been conducted on classroom sound to establish that at least 65 decibels are needed for a student to hear well. This is because the normal noise level in a classroom is about 50 dB and the studies concluded that a signal-to-noise ratio of 15 dB is needed. Translation: the teacher’s voice and all audio sources need to be 15 dB louder than other environmental sounds in the classroom: 50 + 15 = 65 dB. It’s important to note that the 65 dB level is at the students ears, not from the source, e.g. the teacher’s mouth.

So why a microphone for teachers? 

Normal speech is 50-60 dB. Loud speech (using your teacher’s voice”) is about 65 dB. Good right? Wrong. Due to basic physics, after about 12 ft this has decreased to 53 dB. The average air conditioner runs at 50 dB, which means even if the teacher’s voice is 53 dB at 12 ft, it’s only 3 dB higher, not the 15 dB the studies have shown are needed. And any student sitting beyond 12 ft is struggling to comprehend what’s being said.

It’s not just about volume. It is about the consonants.

Often teachers will try to compensate throughout the day by projecting. The main job of a Sound Field system is to evenly distribute high frequency (soft consonant) sounds throughout the room. However, speaking lower pushes the vowel sounds up. Students may hear more, but understand less. The microphone is simply sending the teacher’s voice through the Sound Field system so that it is reproduced for every student as if the teacher is just a couple feet away. It also maintains the crucial soft consonant sounds required for student comprehension.

 

Everyone.

• Effects of high ambient noise levels are overcome
• 30% of children will hear their teacher significantly better
• Teacher absenteeism is reduced
• English Language Learners experience improved word recognition
• Academic test scores improve
• Children with learning disabilities benefit
• Attention and on-task times improve
• Classroom stress is lowered
• Behavior problems are reduced
• Fewer special education referrals
• Class interaction and participation increases
• Improvement in literacy achievement

A classroom sound field system will evenly distribute the teacher’s voice throughout the classroom so that every student can hear all the components of speech as accurately as possible. A loud voice does not mean that consonants are louder. It is impossible for a person to make consonants louder and consonants are key to speech intelligibility. An audio system amplifies the parts of speech that give intelligibility and make it easier for students to understand and concentrate on what the teacher is saying. Learn more about about Sound Field by clicking here.

Many studies can be downloaded from our website under Research Studies.

TeachLogic is a professional audio manufacturer specializing in infrared products, classroom sound-field systems. Today, TeachLogic has established a leadership position in the wireless infrared sound-field industry. Our products are designed to deliver optimum speech intelligibility-providing crystal-clear sound to students regardless of the listening environment.

TeachLogic has provided high-quality Sound Field systems since 1994.

Not all classroom audio companies are the same. TeachLogic’s reputation is to listen to our customers and respond to their needs to the best of our abilities. To design and manufacture innovation, quality, products at fair and reasonable prices. To operate our business with integrity towards our customers and our employees. TeachLogic has established a nationwide network of top integrators to provide immediate customer product knowledge, sales, service and support. In addition, with TeachLogic’s dedicated commitment to customer satisfaction, TeachLogic is the ideal choice for your audio needs.

RF (radio frequency) technology uses radio waves to transmit the audio signal. These are susceptible to RF interference. IR (infrared) technology used infrared light to carry the audio signal thus keeping the signal in the room and eliminating RF interference.

With RF technology, there is a limit depending on local interference and the number of systems desired. With IR technology, as long as the classrooms are enclosed, there is no limit to the number of systems you can have on one campus.

No. Large open-air spaces overwhelm the IR signal. The reflective nature of this technology is ideal for standard classroom audio.

Sometimes a single system is used to support two rooms. However, at times it may be desirable that the speakers in the second room are switched off so the sound does not play in that room. The best way to accomplish this would be with a 3rd party speaker switch such as the one seen here. It is wired inline between the TeachLogic amplifier and the speakers.

1. Plan for the switch location, and measure the length of wire needed to ensure this device is within reach of the user.
2. Connect the TeachLogic amplifier speaker channel that you wish to turn off to the “amp input” connection on this device.
3. Then connect the speakers you wish to control to the “speaker output” connections on this device.
4. Test.

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Summary: For integrators comfortable doing so, you may connect both the fire alarm relay and an intercom/paging IP module relay to the FA Mute Input. The input is a dry contact closure in the normally open position. The amplifier looks for this circuit to close. Any “short” or “closure” of the circuit will mute the amplifier.

Compatibility: TeachLogic Maxim™ and Spectrum™ amplifiers

Disclaimer: We recommend consulting both the fire and paging system specs and instructions to ensure compatibility. We cannot guarantee function, so we recommend repeated testing. Also, we cannot advise whether this will void the other systems’ warranty, service agreement, or another binding document.
Integration: Wire the fire alarm and IP module in series/parallel. This allows either/both to close the circuit.

Download a copy of this document:

TeachLogic-App-Notes-Wiring-FA-Mute-20200317

In most cases, yes. Each system is complete with everything needed to install and operate the system. The type of speaker choice will determine the difficulty in installation. TeachLogic has established a nationwide network of top integrators to provide immediate customer product knowledge, sales, service and installation of systems. TeachLogic’s service department is available to answer any questions regarding the installation.

TeachLogic’s service department is available to answer any questions regarding the re-installation. Depending on your location, we have a list of certified installers that may be available to move your system to a different room.

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“TL” button indicator lights:

No Light: Power is OFF

Solid Blue: Power is ON; 50-100% of battery life

Solid Purple: 25-50% of battery life

Solid Red when using: 0-25% battery life

Blinking Blue: Mic is muted

Solid Red when charging: Charging in progress

Solid Green when charging: Battery is fully charged

Blinking Red: Battery needs to be replaced

Yellow: Mic has entered “test mode”; need to remove battery and reconnect it

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This is how to use two microphones in a large/split room where each side has it’s own amplifier w/ ceiling sensor. This will avoid each room broadcasting the other’s transmission.

WHEN USING THE IRT-60 SAPPHIRE PENDANT MICROPHONE IN EACH ROOM

Step 1: Designate one room for Channel A (room A), and one for Channel B (room B)

Step 2: In room B, change the channel on the IRT-60 Sapphire microphone from A to B. Watch this quick video to see how: https://www.youtube.com/watch?v=01TKGX1ByZo.

Note that the back cover is sometimes difficult to remove.

Step 3: On the opposite channel in each room, turn the mic channel gain all the way down.

• Room A: On the TeachLogic amplifier/receiver, turn down the gain for Ch. B.
• Room B: On the TeachLogic amplifier/receiver, turn down the gain for Ch. A.

WHEN USING THE IRH-35 HANDHELD MICROPHONE IN EACH ROOM

If using an IRH-35 handheld microphone, please note that it comes set on channel B. Therefore, you’ll need to change the other microphone to channel A (for room A).

Step 1: Unscrew the handle

Step 2: Remove the batteries and locate the channel selector.

Step 3: Change the mic for room A to channel A.

Advisory: If you are using both the IRT-60 and IRH-35 in each room, only one mic can be used at a time to avoid interference. Therefore if the handheld microphone is used, the Sapphire will need to be muted and vice versa.

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Yes! These are the instructions to connect an already installed TeachLogic classroom audio system to a computer hosting a video conferencing application to synchronize classroom audio for online listeners. Using a TeachLogic wireless microphone allows the teacher to move freely around the room without affecting audio quality for the students.

Compatible TeachLogic Systems

• Forum™
• Maxim™
• Spectrum™
• Matrix™ (IMA-120)
• Quantum™ II (IRC-360)
• VoiceLink™ I (IR-100) – requires existing audio system

Scroll to continue reading or download the PDF.

Synchronizing Audio for Hybrid Learning

All media devices connected to the TeachLogic amplifier (including microphones) will be heard by online viewers.
All audio—including devices connected directly to the computer—will play through the TeachLogic amplifier/receiver in the classroom.

• Amplifier Output > Computer Input: enables online learners to hear classroom audio including wireless microphones
• Computer Output > Amplifier Input: enables classroom learners to hear computer & conference audio

Planning

1. Placement of the computer should be based on what needs to be visible on camera.
2. Please note that moving any device might affect what cables are required to maintain the connection.
3. Take care to measure the distance between the computer and the TeachLogic amplifier to ensure your audio cables will be long enough.
4. Locate the computer audio connections. Determine if there are separate connections for an audio input & audio output or a single port.
5. If there is a single port, an audio “splitter” that supports both a microphone and speaker connection will be required. See next sections for details on how to identify what cables you will need. See section below for help identifying your computer’s audio connections.

Computer Audio Connections

Audio Cable Requirements

After determining which splitter is needed, determine what additional cables are needed. See below for details.

Maxim, Spectrum, Forum, Matrix, Quantum II

• 2 x 3.5 mm-to-3.5 mm audio cables.

VoiceLink I

• 1 x male RCA-to-3.5 mm audio cable.
• 1 x 3.5 mm-to-3.5 mm audio cable.

Connecting The System

STEP 1: Mark one of the audio cables at both ends with tape, a sticker, or a marker. (if you are connecting a VoiceLink I, mark the RCA-to-3.5 mm cable.)

STEP 2: See below based on your TeachLogic amplifier:

Maxim, Spectrum, Forum

1. Connect the marked 3.5 mm audio cable to an Output port on the TeachLogic amplifier.
2. Connect the other 3.5 mm audio cable to an Input port on the TeachLogic amplifier/receiver.
3. Go to STEP 3.

Matrix, Quantum II

1. Connect the marked 3.5 mm audio cable to an Line Out port on the TeachLogic amplifier.
2. Connect the other 3.5 mm audio cable to an Input port on the TeachLogic amplifier/receiver.
3. Go to STEP 3.

VoiceLink I

1. Connect the RCA end of the RCA-to-3.5 mm cable to the “Line Out” port on the back of the VoiceLink I.
2. Connect the other 3.5 mm audio cable to the Input port on the front of the VoiceLink I.

STEP 3: Pick up the unconnected ends of the cables and way to the computer.

STEP 4: If using an audio splitter, connect that the applicable port on the computer.

STEP 5: Connect the the marked audio cable to the computer’s mic/audio input (this is the pink port and/or the one marked with a microphone symbol).

STEP 6: Connect the second cable to the computer’s speaker output (this is the green port and/or the one marked with a speaker symbol).

STEP 7: Verify all cables are seated properly and nothing came loose.

STEP 8: On the amplifier, set the gain control knobs for the Input and Output to the 10′ o click position.

Testing The Conference Audio

Each conference application and computer has its own settings. Settings may vary from application to application and computer to computer. Please refer to their respective user guides if you have trouble locating the settings.

This test will require a second person with another device to join the video conference.

STEP 1: Launch your video conference application and start a meeting. When in the conference, change both the microphone and speaker setting.

STEP 2: Set the computer’s volume to mid-scale (40-50%).

STEP 3: Invite the other person and have them leave the room. Turn on the TeachLogic microphone, place it at your collarbone (where it would naturally set) and begin speaking to the other person in the conference. They should hear you and you should hear them through the classroom speakers.

Be sure that the video conference “Mute” function is not active as that is sometimes the default setting at the start of a conference.

STEP 4: Verify that the person hears you through the TeachLogic microphone by muting the microphone (momentarily press the “TL” button to mute). If they can not longer hear you, the connection is successful.

Adjusting the Volume

• Amplifier microphone channel: Adjusts the microphone volume both in-class and on Zoom
• Amplifier audio Output: Adjusts the volume of the computer audio heard by students online
• Amplifier audio Input: Adjusts the volume of everything coming from the computer into the classroom

A Note About Online Video Players Like YouTube

For a closer look, watch the how-to video below. To find out what system is best for your needs, contact us.

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TeachLogic offers three different IR transmitter choices: our Sapphire Pendant microphone, a handheld microphone, and a wireless transmitter that enables mobile or stationary AV equipment like a TV to be wirelessly connected to the in-room TeachLogic audio system.

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A handheld microphone can also be a powerful tool to help students gain confidence when presenting or reading aloud. Also, it is very helpful for students to hear their fellow classmates as they make their presentations.

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A microphone that is being used regularly needs to be charged every night. When the microphone will not be used for an extended period of time–such as winter or summer break–then fully charge the battery and disconnect the charger from its power source. Recharge the battery upon your return.

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The assisted listening device is patched with a cord from the mic jack or aux input on the transmitter to the mixer auxiliary output on the front of the TeachLogic classroom amplifier. All TeachLogic amplifiers have a gain control on the front panel next to the output to adjust the volume. This will then transmit the signal to the assistive listening device that the student is wearing or has on the desktop.

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Not all classrooms are the same. We offer two ceiling speaker packages made for suspended acoustic ceiling and wall mounted speakers for hard ceilings.

TeachLogic offers several types of speakers to meet many different room sizes and acoustic needs. The room dimensions and ceiling height will determine which speaker will provide optimum performance.

The coverage for a TeachLogic Classroom Sound-Field System will depend upon speaker choice. Typically, a system covers 1500 to 2500 square feet.

For regular classroom use, many teachers prefer to use the Quantum II for infrared wireless transmission. This system uses the same Sapphire Pendant transmitter that is used with the infrared classroom sound-field systems. This unit will cover up to 1800 square feet and must be used indoors. This amplifier can be wall mounted, installed on a tripod stand or free standing on a shelf or cabinet.

Yes. Our handheld microphone uses AA rechargeable batteries while our pendant microphones (IRT-55 & IRT-60 models) use a rechargeable lithium polymer battery. For more info:  https://teachlogic.com/product-category/components/batteries/

These batteries with proper care can last up to three years.

Yes, but these batteries CAN NOT be charged as charging them will cause damage that is not covered under warranty. TeachLogic battery chargers have built-in circuit protection that will not charge alkaline batteries.

With proper maintenance, a classroom sound-field system should last approximately 10+ years.

Yes. You can add an infrared microphone system to your RF system. This allows you to keep your existing amplifier and speakers and add only the IR wireless microphone component. VoiceLink I is a single channel IR system.

We have a Full Line Catalog available for download. The link can be found at the bottom of the home page. Individual product brochures available in the download section of the individual product.

The system comes with a user manual, but the local TeachLogic integrator in your area may be available for in-service training.

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Please contact us so we can help get you the help you need. 

Sometimes a single system is used to support two rooms. However, at times it may be desirable that the speakers in the second room are switched off so the sound does not play in that room. The best way to accomplish this would be with a 3rd party speaker switch such as the one seen here. It is wired inline between the TeachLogic amplifier and the speakers.

1. Plan for the switch location, and measure the length of wire needed to ensure this device is within reach of the user.
2. Connect the TeachLogic amplifier speaker channel that you wish to turn off to the “amp input” connection on this device.
3. Then connect the speakers you wish to control to the “speaker output” connections on this device.
4. Test.

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The updated firmware (ver 2.12 or 3.5) adds a feature to put the IMA-120 amplifier in a low power Standby mode when not in use.  This helps ensure long product life and reduce power consumption. 

After 2 hours of no audio activity on amplifier inputs (wireless mics and auxiliary audio inputs), the amplifier will go into low-power Standby mode.

It can also be manually placed in Standby with two short presses of the power button.

LED COLOR INDICATORS

• AMBER: Standby
• BLUE: Power ON
• RED: Power OFF
• The TeachLogic CPS-120/CPR-125 control panel is also darkened during Standby mode.

WAKING UP FROM STANDBY

An audio signal from either wireless microphone or Aux1 or Aux2 inputs will cause the amplifier to go from Standby to ON mode.  So the simplest action for an end user is to power on a microphone, and speak into it.  It takes a few seconds to power up the amplifier section and amplify inputs.

This is a critical update for units with FW versions beginning in 2.X that have never been upgraded. Without it, the amplifier may fail prior to its designed lifespan.

ITEMS NEEDED

1. USB to micro-USB cable (You can use TeachLogic p/n RC-15, the charger cable for Sapphire microphone and BRC-60 drop in battery charger)
2. A small tool like a paperclip.
3. MSP430 Python Firmware Upgrader software; installed on your PC. Click on the word DOWNLOAD, unzip, extract and save folder of files to your PC: DOWNLOAD. Make note of where you save this folder on on your PC.
4. New firmware file for IMA-120. Download below.

CHOOSE YOUR FIRMWARE

Choose your file based on whether you want the amplifier to mute only, or pass through the page to the classroom speakers. Choose file 3.5CPP or 3.5CPM if your current firmware version starts with 3.X. Choose file 2.12PP or 2.12PM if your current version starts with 2.X. The standard version is either 2.12PP or 3.5CPP. Choose this if you are unsure which version you have now.

After you click Download, a web page will open. Right click with your mouse and Save As a .TXT file in location where you can easily “Open” the file for the steps below.

2.12PP has “Page Pass Through” and “Page Mute” meaning that audio signal on Page input terminal is played over speakers when amplifier is powered on. Other audio inputs are muted and not played on speakers. For use on units with current firmware version 2.X. Click here: Download 2.12PP

2.12PM has Page Muting, but no Page Pass Through. The paging audio is not played on speakers, but all audio is muted when page signal is present. For use on units with current firmware version 2.X. Click here: Download 2.12PM

3.5CPP has “Page Pass Through” and “Page Mute” meaning that audio signal on Page input terminal is played over speakers when amplifier is powered on. Other audio inputs are muted and not played on speakers. For use on units with current firmware version 3.X. Click here: Download 3.5CPP

3.5CPM has Page Muting, but no Page Pass Through. The paging audio is not played on speakers, but all audio is muted when page signal is present. For use on units with current firmware version 3.X. Click here: Download 3.5CPM

WARNING

• Discharge all static electricity from yourself and anything else that may touch the amplifier or cables.
• Modify only one amplifier and ensure the results are as desired before modifying more amplifiers.
• If steps are not followed correctly, you could damage your product.

PREPARATION

Have your computer on and ready with the download files. Place the the amplifer(s) within reach. And have the USB cable and small tool.

UPDATE PROCEDURE

1. Open the MSP430 Python_Firmware_Upgrader.
2. Locate and run the Upgrader by double clicking on Python_Firmware_UpgraderGUI application.
3. The Upgrader will ask you to set the device (TeachLogic IMA-120) into bootstrap load mode (BSL) before selecting the firmware file. When the GUI is running properly, you will see the following window.

4. Note: IMA-120 shall not be connected to its power supply during this upload procedure. If it is connected, please disconnect power supply and move to next step.
5. Connect USB cable to PC and keep the other end next to the IMA-120, but do not yet connect to the IMA-120 amp. 
6. You’ll need two hands for this next step. To set the amp in BSL, gently depress the white switch to right of IMA-120 micro-USB “Upgrade” port. 
7. With switch depressed, plug micro USB cable into amp. Then release the white switch after plugging in. Note: if the power light begins blinking blue, you do not have the white button depressed. Remove the USB from the Matrix and start again by pressing the white button first.

8. Use File command on Upgrader and select Rescan HID Bus.  (The easiest way to do this on keyboard is Alt-F, Alt-R. 

9. Then you will see “ready …” as a prompt showing on the screen. See below.

10. Use File menu, then Open User Firmware; browse to firmware file. Or, you may use the keyboard shortcut Alt + F, then Alt +O without needing the mouse.  
11. Select the intended file [e.g.:  IMA-120_REV2.6.2(page bypass)_20201112.txt]
12. After a few seconds of uploading new firmware to IMA-120, the Uploader will give a final message of Programming: OK      This indicates the process succeeded. Also, the power button will begin flashing blue.
13. Remove the USB cable and you may power up the amplifier at this time.

If you encounter any issues, you will need to repeat this process taking care to follow each step exactly.

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This is how to use two microphones in a large/split room where each side has it’s own amplifier w/ ceiling sensor. This will avoid each room broadcasting the other’s transmission.

WHEN USING THE IRT-60 SAPPHIRE PENDANT MICROPHONE IN EACH ROOM

Step 1: Designate one room for Channel A (room A), and one for Channel B (room B)

Step 2: In room B, change the channel on the IRT-60 Sapphire microphone from A to B. Watch this quick video to see how: https://www.youtube.com/watch?v=01TKGX1ByZo.

Note that the back cover is sometimes difficult to remove.

Step 3: On the opposite channel in each room, turn the mic channel gain all the way down.

• Room A: On the TeachLogic amplifier/receiver, turn down the gain for Ch. B.
• Room B: On the TeachLogic amplifier/receiver, turn down the gain for Ch. A.

WHEN USING THE IRH-35 HANDHELD MICROPHONE IN EACH ROOM

If using an IRH-35 handheld microphone, please note that it comes set on channel B. Therefore, you’ll need to change the other microphone to channel A (for room A).

Step 1: Unscrew the handle

Step 2: Remove the batteries and locate the channel selector.

Step 3: Change the mic for room A to channel A.

Advisory: If you are using both the IRT-60 and IRH-35 in each room, only one mic can be used at a time to avoid interference. Therefore if the handheld microphone is used, the Sapphire will need to be muted and vice versa.

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Yes! These are the instructions to connect an already installed TeachLogic classroom audio system to a computer hosting a video conferencing application to synchronize classroom audio for online listeners. Using a TeachLogic wireless microphone allows the teacher to move freely around the room without affecting audio quality for the students.

Compatible TeachLogic Systems

• Forum™
• Maxim™
• Spectrum™
• Matrix™ (IMA-120)
• Quantum™ II (IRC-360)
• VoiceLink™ I (IR-100) – requires existing audio system

Scroll to continue reading or download the PDF.

Synchronizing Audio for Hybrid Learning

All media devices connected to the TeachLogic amplifier (including microphones) will be heard by online viewers.
All audio—including devices connected directly to the computer—will play through the TeachLogic amplifier/receiver in the classroom.

• Amplifier Output > Computer Input: enables online learners to hear classroom audio including wireless microphones
• Computer Output > Amplifier Input: enables classroom learners to hear computer & conference audio

Planning

1. Placement of the computer should be based on what needs to be visible on camera.
2. Please note that moving any device might affect what cables are required to maintain the connection.
3. Take care to measure the distance between the computer and the TeachLogic amplifier to ensure your audio cables will be long enough.
4. Locate the computer audio connections. Determine if there are separate connections for an audio input & audio output or a single port.
5. If there is a single port, an audio “splitter” that supports both a microphone and speaker connection will be required. See next sections for details on how to identify what cables you will need. See section below for help identifying your computer’s audio connections.

Computer Audio Connections

Audio Cable Requirements

After determining which splitter is needed, determine what additional cables are needed. See below for details.

Maxim, Spectrum, Forum, Matrix, Quantum II

• 2 x 3.5 mm-to-3.5 mm audio cables.

VoiceLink I

• 1 x male RCA-to-3.5 mm audio cable.
• 1 x 3.5 mm-to-3.5 mm audio cable.

Connecting The System

STEP 1: Mark one of the audio cables at both ends with tape, a sticker, or a marker. (if you are connecting a VoiceLink I, mark the RCA-to-3.5 mm cable.)

STEP 2: See below based on your TeachLogic amplifier:

Maxim, Spectrum, Forum

1. Connect the marked 3.5 mm audio cable to an Output port on the TeachLogic amplifier.
2. Connect the other 3.5 mm audio cable to an Input port on the TeachLogic amplifier/receiver.
3. Go to STEP 3.

Matrix, Quantum II

1. Connect the marked 3.5 mm audio cable to an Line Out port on the TeachLogic amplifier.
2. Connect the other 3.5 mm audio cable to an Input port on the TeachLogic amplifier/receiver.
3. Go to STEP 3.

VoiceLink I

1. Connect the RCA end of the RCA-to-3.5 mm cable to the “Line Out” port on the back of the VoiceLink I.
2. Connect the other 3.5 mm audio cable to the Input port on the front of the VoiceLink I.

STEP 3: Pick up the unconnected ends of the cables and way to the computer.

STEP 4: If using an audio splitter, connect that the applicable port on the computer.

STEP 5: Connect the the marked audio cable to the computer’s mic/audio input (this is the pink port and/or the one marked with a microphone symbol).

STEP 6: Connect the second cable to the computer’s speaker output (this is the green port and/or the one marked with a speaker symbol).

STEP 7: Verify all cables are seated properly and nothing came loose.

STEP 8: On the amplifier, set the gain control knobs for the Input and Output to the 10′ o click position.

Testing The Conference Audio

Each conference application and computer has its own settings. Settings may vary from application to application and computer to computer. Please refer to their respective user guides if you have trouble locating the settings.

This test will require a second person with another device to join the video conference.

STEP 1: Launch your video conference application and start a meeting. When in the conference, change both the microphone and speaker setting.

STEP 2: Set the computer’s volume to mid-scale (40-50%).

STEP 3: Invite the other person and have them leave the room. Turn on the TeachLogic microphone, place it at your collarbone (where it would naturally set) and begin speaking to the other person in the conference. They should hear you and you should hear them through the classroom speakers.

Be sure that the video conference “Mute” function is not active as that is sometimes the default setting at the start of a conference.

STEP 4: Verify that the person hears you through the TeachLogic microphone by muting the microphone (momentarily press the “TL” button to mute). If they can not longer hear you, the connection is successful.

Adjusting the Volume

• Amplifier microphone channel: Adjusts the microphone volume both in-class and on Zoom
• Amplifier audio Output: Adjusts the volume of the computer audio heard by students online
• Amplifier audio Input: Adjusts the volume of everything coming from the computer into the classroom

A Note About Online Video Players Like YouTube

For a closer look, watch the how-to video below. To find out what system is best for your needs, contact us.

[printfriendly]

Summary: For integrators comfortable doing so, you may connect both the fire alarm relay and an intercom/paging IP module relay to the FA Mute Input. The input is a dry contact closure in the normally open position. The amplifier looks for this circuit to close. Any “short” or “closure” of the circuit will mute the amplifier.

Compatibility: TeachLogic Maxim™ and Spectrum™ amplifiers

Disclaimer: We recommend consulting both the fire and paging system specs and instructions to ensure compatibility. We cannot guarantee function, so we recommend repeated testing. Also, we cannot advise whether this will void the other systems’ warranty, service agreement, or another binding document.
Integration: Wire the fire alarm and IP module in series/parallel. This allows either/both to close the circuit.

Download a copy of this document:

TeachLogic-App-Notes-Wiring-FA-Mute-20200317

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“TL” button indicator lights:

No Light: Power is OFF

Solid Blue: Power is ON; 50-100% of battery life

Solid Purple: 25-50% of battery life

Solid Red when using: 0-25% battery life

Blinking Blue: Mic is muted

Solid Red when charging: Charging in progress

Solid Green when charging: Battery is fully charged

Blinking Red: Battery needs to be replaced

Yellow: Mic has entered “test mode”; need to remove battery and reconnect it

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The two main causes of a persistent humming or buzzing are:

1. a bad audio cable connected to the amplifier, or
2. there is electrical noise being passed through an audio cable into the amplifier.

When audio cables are damaged, they either lose their grounding efficacy or no longer seat properly in the plug.  This poor connection creates a low frequency hum and/or buzzing.

It has also been observed that insufficient electrical grounding in buildings can easily travel through audio cables and into an amplifier thereby creating a low frequency hum and/or buzzing.

Bad cables need to be replaced whereas the electrical noise issue might simply require turning down the volume on the amplifier input where the noisy cable is connected.

Troubleshooting:

Step 1: Visually inspect the audio cables for visible damage and ensure they are seated properly.  If the noise changes in any way while touching a cable—such as a crackle, pop, or rustling sound—then the cable is likely bad. Unplug that cable to see if the noise goes away.  If it does, then you need to replace the audio cable.

Step 2: If there is no visible damage, then unplug each cable one at a time. If the noise goes away, the replace that cable.

Step 3: If the new cable does not solve the issue, then check the volume of the audio source.  We have observed grounding issues in classrooms and the noise is simply an amplification of the ground noise.  

If a wall control panel is being used, see below. Otherwise, observe what input on the amplifier the cable is connected to and adjust the corresponding volume knob up and down to see if this alters the volume of the noise.  If it does, then you need to keep the volume set to a level where noise is no longer audible.

Wall Control Panel: On the wall panel, adjust the volume for the corresponding input where the cable is connected to see if this changes the volume of the buzzing.  If it does, then you need to keep the volume set to a level where noise is no longer audible.

Note: you may also adjust the volume on the audio device (such as a laptop), to see if this alters the volume of the buzzing.  If it does, then you need to keep the volume set to a level where noise is no longer audible.

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When a Page signal is detected and the amplifier is muted, the page plays through the classroom loudspeakers, but not the ALS or Lesson Capture outputs.

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With the exception of one balanced input on our VoiceLink I pre-amp, all of our amplifier inputs & outputs are monophonic unbalanced TS connections.

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If your amplifier is equipped with an RS-232 input (for connecting a wall mounted control panel), there is also an ON/OFF switch for this feature. When switched to the ON position, the amplifier disables the volume/gain controls on the amplifier. If you do not need to use the RS-232 input, then ensure the switch is in the OFF position to enable the function of the control knobs.

• Make sure that speakers are mounted as close as possible to both the ceiling and the listeners
• Avoid mounting speakers in the teacher’s primary lecture area
• Position the microphone closer to mouth
• Lower the Mic. Volume control(s) on the receiver

• Make sure that speakers are mounted as close as possible to both the ceiling and the listeners
• Verify that the receiver is on (red power light above power switch)
• Verify that the receiver is picking up a signal (green channel indication light next to volume control knob)
• Increase the Mic. Volume or Aux volume control(s) on the receiver
• Position the microphone closer to mouth
• Verify that the speakers cables are connected properly
• Verify that the transmitter is not muted

• Verify that the power supply is plugged into both the receiver and a working wall outlet.
• Test with another power supply.

• Verify that you are not blocking either the emitters on the transmitter or the sensors or mounted ceiling sensor.
• If reception is interrupted when facing a certain direction, install an additional sensor  (ICS-55) in that area of the room
• If team-teaching, verify that transmitters are not on the same channel
• Recharge or replace the transmitter’s batteries
• Verify that the emitter/mic is working (Test with another working emitter/mic)

If the problem persists, call the TeachLogic service department to further trouble shoot the problem. If the technician determines that the product needs to be returned for service, the technician will issue a return authorization number (RA#) to track the repair. Repair by other than TeachLogic or its authorized service agencies will void the warranty.

RA stands for Return Authorization. This number is used to track items that have been returned for repair.

Yes in many instances. Please check our Repairs/Returns page for helpful tips or to contact TeachLogic to determine the most cost effective course of action.

You may return the equipment within 30 days of the invoice and receive a full refund of the purchase price. After 30 days, there is a minimum 20% restocking fee.

You may exchange a microphone of equal price within the first 30 days at no extra charge.

Often, the volume of the classroom sound field system is turned up too high. The volume should be at a level that is heard will by the students and not necessarily the teacher.

The only precautions that are necessary are to fully charge the batteries, and then make sure the battery charger and amplifier are unplugged from the power source.

Contact the TeachLogic installation company in your area, on-site service may be purchased from that provider.

No. The warranty does not cover damages that are not defects from manufacturing.

The product warranty is on this website under Warranty (click here).