Frequently Asked Questions

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General Information about Classroom Audio

  • add_circleremove_circle_outlineWhat is a Classroom Sound Field System?

    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.

     

  • add_circleremove_circle_outlineWho will benefit from a Classroom Sound Field System?

    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
  • add_circleremove_circle_outlineI have a loud teaching voice. Why would I need Classroom Sound Field System?

    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.

  • add_circleremove_circle_outlineWhere would I get some more information on studies about Classroom Audio?

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

General TeachLogic Information

  • add_circleremove_circle_outlineWhat is the TeachLogic difference?

    TeachLogic is a professional audio manufacture 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.

  • add_circleremove_circle_outlineHow long has TeachLogic been in business?

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

  • add_circleremove_circle_outlineWhat sets TeachLogic apart from its competitors?

    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.

Infrared Technology

  • add_circleremove_circle_outlineWhat is the difference between RF and IR wireless technologies?

    RF (radio frequency) technology uses radio waves to transit 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.

  • add_circleremove_circle_outlineIs there a limit to the number of systems I can have in my school?

    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.

  • add_circleremove_circle_outlineDoes IR work outside?

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

Installation Questions

  • add_circleremove_circle_outlineEnable muting by both Page and Fire Alarm on one input

    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™ III and Spectrum™ III 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 other binding document.
    Integration: Wire the fire alarm and IP module in series/parallel. This allows any one to close the circuit.

    FA mute pagefire wiring diagram 1

    classroom audio fire alarm sensing relay

     

    Download a copy of this document:

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

  • add_circleremove_circle_outlineDoes my Classroom Sound Field System need to be installed?

    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.

  • add_circleremove_circle_outlineMy system needs to be moved. What should I do?

    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 maybe available to move your system to a different room.

Product Questions

  • add_circleremove_circle_outlineCan a TeachLogic microphone be used with video conferencing apps for Distance Learning?


    A TeachLogic sound amplification system creates equitable access to the teacher’s voice.

    The same components work for in-class, hybrid, and remote learning plans. When used in conjunction with video conferencing applications like Zoom and Google Meet, the teacher’s voice will sound just a few feet away at all times–even if they’re walking around a classroom.

    distance models

    For maximum comprehension, connect other media devices to the TeachLogic amplifier/receiver to ensure students hear all audio equally well regardless of where they’re learning from.

    students left the traditional classroom

    Read the steps below to learn how to set up your classroom for video conferencing and/or recording.

    Step 1: Connect an audio cable from the TeachLogic amplifier/receiver output port to the microphone (mic) input on the computer running the video program.

    Note that the mic input on most computers is a 3.5 mm port. These are often surrounded by a pink circle, but might be black or silver on newer computers. There should be a microphone or headset symbol designating that this is the mic input port.

    • Maxim III, Spectrum III, and Forum 232: using a 3.5 mm audio cable, connect from either the ALS or Lesson Capture output to the computer mic input.
    • Matrix & Quantum II: using a 3.5 mm audio cable, connect from the “Line Out” port on the amplifier to the computer mic input.
    • VoiceLink I: using an RCA-to-3.5 mm cable, connect from the “Line Out” port on the VoiceLink I to the computer mic input.

    lesson recording outputs

    Computer mic settings

    Step 2: If applicable, connect additional media sources to the “input” ports on the TeachLogic amplifier/receiver. The number of inputs vary based on the model.

    Step 3: Go to the computer’s Audio/Sound Settings menu and select the computer’s mic source.  This is often labeled with the name of the sound card manufacturer–“Realtek” in the example below.

    Step 4: Launch your video app and broadcast/record a test video.  If the volume is too low or too high, locate the control dial adjacent to the output port you used on the TeachLogic amplifier/receiver. Turn the dial clockwise to increase the volume, counterclockwise to decrease.

    If you need additional adjustment, locate the microphone settings on your video recording application.

    Step 5: Document your specific settings to ensure a repeatable experience.

    For a closer look, watch this how-to video.

  • add_circleremove_circle_outlineWhat are my Infrared transmitter choices?

    TeachLogic offers two different IR transmitter choices; Sapphire Pendant and handheld.

  • add_circleremove_circle_outlineWhy should I get a handheld microphone?

    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.

  • add_circleremove_circle_outlineHow often should I charge my microphone?

    A microphone that is being used regularly needs to be charged every night.

  • add_circleremove_circle_outlineHow do I connect an assistive listening device to my classroom system?

    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.

  • add_circleremove_circle_outlineHow many IR microphones can I operate simultaneously?

    Each classroom audio system has two frequencies so that two microphones can be used simultaneously. TeachLogic also offers VoiceLink IV with a four channel receiver for operation of up to four wireless microphones.

  • add_circleremove_circle_outlineWhy are there different speaker options?

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

  • add_circleremove_circle_outlineWhat type of speaker should I choose?

    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.

  • add_circleremove_circle_outlineWhat is the effective coverage of a Classroom Sound Field System?

    The coverage for a TeachLogic Classroom Sound-Field System will depend upon speaker choice. Typically, a system covers 1500 to 250 square feet.

  • add_circleremove_circle_outlineI need Portable Audio. What is my best option?

    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.

  • add_circleremove_circle_outlineDoes TeachLogic sell rechargeable batteries?

    Yes, we use Duracell 2450 mAh nickel metal hydride with a two-year warranty. TeachLogic has tested several battery manufactures for the best performing rechargeable battery for operation time and life span and Duracell rechargeable batteries we have found to be the best.

  • add_circleremove_circle_outlineWhat is the life span of the rechargeable NIMH batteries?

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

  • add_circleremove_circle_outlineCan I use alkaline batteries in my microphone?

    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.

  • add_circleremove_circle_outlineWhat is the expected life span of a Classroom Sound Field System?

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

  • add_circleremove_circle_outlineI have radio Frequency (RF) based classroom systems. Can I upgrade to an infrared (IR) system?

    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 and VoiceLink III is a two channel system.

  • add_circleremove_circle_outlineDoes TeachLogic have a product catalog?

    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.

  • add_circleremove_circle_outlineWho will train me on the use of my system?

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

Sales/Ordering Questions

  • add_circleremove_circle_outlineHow do I order a TeachLogic system?

    TeachLogic has established a nationwide network of top integrators to provide immediate customer knowledge, sales, service and support. Go to our find a dealer page on the website to find a local dealer in your area.

  • add_circleremove_circle_outlineI’m planning on purchasing many systems. Is there a discount?

    Multi-system discounts are available. The discount will depend upon the number of systems being purchased.

Technical Application Notes

  • add_circleremove_circle_outlineCan a TeachLogic microphone be used with video conferencing apps for Distance Learning?


    A TeachLogic sound amplification system creates equitable access to the teacher’s voice.

    The same components work for in-class, hybrid, and remote learning plans. When used in conjunction with video conferencing applications like Zoom and Google Meet, the teacher’s voice will sound just a few feet away at all times–even if they’re walking around a classroom.

    distance models

    For maximum comprehension, connect other media devices to the TeachLogic amplifier/receiver to ensure students hear all audio equally well regardless of where they’re learning from.

    students left the traditional classroom

    Read the steps below to learn how to set up your classroom for video conferencing and/or recording.

    Step 1: Connect an audio cable from the TeachLogic amplifier/receiver output port to the microphone (mic) input on the computer running the video program.

    Note that the mic input on most computers is a 3.5 mm port. These are often surrounded by a pink circle, but might be black or silver on newer computers. There should be a microphone or headset symbol designating that this is the mic input port.

    • Maxim III, Spectrum III, and Forum 232: using a 3.5 mm audio cable, connect from either the ALS or Lesson Capture output to the computer mic input.
    • Matrix & Quantum II: using a 3.5 mm audio cable, connect from the “Line Out” port on the amplifier to the computer mic input.
    • VoiceLink I: using an RCA-to-3.5 mm cable, connect from the “Line Out” port on the VoiceLink I to the computer mic input.

    lesson recording outputs

    Computer mic settings

    Step 2: If applicable, connect additional media sources to the “input” ports on the TeachLogic amplifier/receiver. The number of inputs vary based on the model.

    Step 3: Go to the computer’s Audio/Sound Settings menu and select the computer’s mic source.  This is often labeled with the name of the sound card manufacturer–“Realtek” in the example below.

    Step 4: Launch your video app and broadcast/record a test video.  If the volume is too low or too high, locate the control dial adjacent to the output port you used on the TeachLogic amplifier/receiver. Turn the dial clockwise to increase the volume, counterclockwise to decrease.

    If you need additional adjustment, locate the microphone settings on your video recording application.

    Step 5: Document your specific settings to ensure a repeatable experience.

    For a closer look, watch this how-to video.

  • add_circleremove_circle_outlineEnable muting by both Page and Fire Alarm on one input

    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™ III and Spectrum™ III 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 other binding document.
    Integration: Wire the fire alarm and IP module in series/parallel. This allows any one to close the circuit.

    FA mute pagefire wiring diagram 1

    classroom audio fire alarm sensing relay

     

    Download a copy of this document:

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

Technical/Service Questions

  • add_circleremove_circle_outlineI’m getting feedback (squealing) – how can I minimize this?

    • 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
  • add_circleremove_circle_outlineThere’s no sound coming out of the speakers (or it’s weak).

    • 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
  • add_circleremove_circle_outlineMy receiver won’t turn on – the power light is off. What should I do?

    • Verify that the power supply is plugged into both the receiver and a working wall outlet.
    • Test with another power supply.
  • add_circleremove_circle_outlineHow can I eliminate “dead spots” or microphone crackling / noise?

    • 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)
  • add_circleremove_circle_outlineMy equipment is still not functioning properly. What should I do?

    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.

  • add_circleremove_circle_outlineWhat is an `RA` number?

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

  • add_circleremove_circle_outlineMy equipment is damaged. Can it be repaired?

    Yes in many instances. Please contact the TeachLogic service department to determine the most cost effective course of action.

  • add_circleremove_circle_outlineI am unhappy with my equipment. Can I return it?

    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.

  • add_circleremove_circle_outlineI want a different microphone. Can I exchange mine?

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

  • add_circleremove_circle_outlineThe teacher next door is complaining that he/she hears my lesson. What should I do?

    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.

  • add_circleremove_circle_outlineShould I take any precautions when storing my system over the summer?

    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.

  • add_circleremove_circle_outlineAre there on-site service contracts available?

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

Warranty Questions

  • add_circleremove_circle_outlineIs physical damage covered under the TeachLogic warranties?

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

  • add_circleremove_circle_outlineWhere can I find the warranty statement?

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

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