Since its inception in 1992 TeachLogic has been an active participant in assisting our clients in studying the benefits of sound amplification in the classroom.

General Information about Classroom Audio

• What is a Classroom Soundfield System?
  
  

  A Classroom Soundfield System is essentially a small public address sound system, designed for the confines of a typical classroom of 25–35 students.
  From a hardware standpoint, the system usually consists of two wireless microphones. One is primarily for the teacher, and the second microphone is generally used by students. Most sound-field systems are currently using infrared wireless microphone technology. Since infrared is based on pulsating light, the transmission of the wireless microphones will not penetrate the walls of a classroom into another room. This allows us to set up dozens or even hundreds of classrooms very close to each other with no interference.
  The system also features a built in mixer and amplifier that will also be able to amplify audio from such sources as a computer, a DVD, TV tuner, or even an Ipod.
  The next critical part of a Sound-field System consists of several (four or more) overhead ceiling speakers. The key to really making a Sound-field system work effectively is a smooth “wash” of sound throughout the entire classroom. Ideally, every student should be listening at a distance of about six feet from the nearest loudspeaker so that we maintain the illusion of having the teacher standing six feet in front of you.
  Ceiling loudspeakers are kind of like ceiling light bulbs. For even coverage, you wouldn’t use just one or two to cover the entire classroom. The same goes for ceiling loudspeakers.
  The main problem that students encounter while trying to listen to instruction is that they are simply too far from the teacher’s voice and the classroom can be a noisy environment with computers and air conditioning.
  In a world of Ipods, loud car stereos, very loud movie theatres, noisy video games and home television, most students simply do not pay attention to low sound levels (or teacher’s instructions) that are less than 63-65 decibels.
  If a teacher tries to produce 75 decibels of sound at arm’s length (about 18”) they will find that this is no easy feat. Plus, that 75 decibel sound wave is going to be reduced to 63 decibels at six feet from the teacher’s voice. (that old inverse square law rule from physics class). The front row in most schools is about six feet from the teacher.
  Back to that 63 decibel level at the first row……….Once you move back a couple of rows to twelve feet from the teacher, the teacher’s voice drops another 6 decibels to about 57 decibels. The very last row tends to be about 20 - 24 feet from the teacher’s voice and although inverse square law tends to stop being a factor after about 18 ft, that distance produces another 2-3 decibels in loss of sound. That final sound level from the teacher at 54 - 55 decibels in the back rows is simply not enough to get good student attention. Thus, the need for amplification.
  Plus, if the teacher turns his/her back to the students while at the chalkboard/interactive board, the teacher’s voice is “splattered” and reflected off the front wall or screen and is much more difficult for any students to understand.
  In summary, wearing a wireless microphone allows the teacher’s voice to always appear as if he/she is facing the student and the amplified overhead ceiling speakers give the illusion of the teacher only being six feet away. The magic of modern technology.
  
  

• Who will benefit from Classroom sound-field?
  
  

  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

  
  
  

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

  A classroom sound-field system will evenly disperse 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.
  
  

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

  Many studies can be downloaded from our website Research Studies.
  
  

General TeachLogic Information

• What is the TeachLogic difference?
  
  

  TeachLogic is a professional audio manufacture specializing in infrared products, classroom sound-field systems, UHF wireless systems and portable sound systems. TeachLogic made its mark equipping customers with superior UHF wireless classroom sound 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.
  
  

• How long has TeachLogic been in business?
  
  

  Established in 1992, TeachLogic has provided high-quality sound-field systems for the small presentation environment (areas up to 2,500 sq. feet).
  
  

• What 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.
  
  

• Does TeachLogic attend trade shows?
  
  

  Yes, we attend regional and national traded shows. Click here for a link to the shows TeachLogic will be attending this year Tradeshows.
  
  

Technical/Service Questions

• I’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

  
  
  

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

  • 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

  
  
  

• My 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.

  
  
  

• How 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 corner/wall sensor (IWS-35) 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)

  
  
  

• My 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, he 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.
  
  

• What is an “RA” number?
  
  

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

• My 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.
  
  

• I 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.
  
  

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

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

• The 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.
  
  

• Can the TV/DVD player in my classroom be integrated with the classroom audio system?
  
  

  Yes, the system also features a built in mixer and amplifier that will also be able to amplify audio from such sources as a computer, a DVD, TV tuner or even an iPod. A simple patch cable can connect these devises to the system via LINE/AUX input on the back of the amplifier.
  
  

• Should 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.
  
  

• Are there on-site service contracts available?
  
  

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

General Installation Questions

• Does my Classroom Sound-Field system need to be installed?
  
  

  In most cased, 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.
  
  

• My 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.
  
  

Warranty Information

• What is the warranty period for classroom sound-field systems and what does it cover?
  
  

  The main system components (amplifier, speakers, microphones, power supply) have a limited warranty of five years from the date of purchase. The accessories (rechargeable batteries, external cables & wires) have a limited warranty of one year. Warranty does not extend to finish, appearance items or malfunctions due to abuse or operation other than specified conditions, nor does it extend to incidental or consequential damages.
  Click here for details 5 Year Warranty.
  
  

• What is the warranty period for the RF products and what does it cover?
  
  

  The personal RF products have a three-year limited warranty on all components against malfunctions due to defects in materials and workmanship. The accessories (rechargeable batteries, external cables & wires) have a limited warranty of one year. Warranty does not extend to finish, appearance items, or malfunctions due to abuse or operation other than specified conditions, not does it extend to incidental or consequential damages.
  Click here for detailed 3 Year Warranty.
  
  

• My microphone was stolen. Is this covered under warranty?
  
  

  No. The warranty covers malfunction due to materials and workmanship.
  
  

• Is physical damage covered under the TeachLogic warranties?
  
  

  The warranty does not apply to incidental or consequential damages.
  
  

General Information on Infrared Technology

• What 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.
  
  

• Is 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.
  
  

• Can IR work outside?
  
  

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

Product Information

• What are my Infrared transmitter choices?
  
  

  TeachLogic offers four different IR transmitter choices; Crescent, Pendant, Body-Pack (with choice of collar, lapel, headset or ultra-lite microphone) and handheld.
  
  

• Why 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.
  
  

• What is a Crescent Transmitter?
  
  

  The “Crescent” aesthetic design and light weight make it the most pleasing and comfortable microphone to ware. Its ultimate vocal performance is achieved by two uni-directional microphones providing uniform pickup across the top. The strategic array of IR emitting diodes assures wireless connectivity throughout the room. An auxiliary input provides the opportunity to input an iPod for wireless transmission. The mute button allows for private conversation and a gain control varies the volume. The Crescent is supported by a detachable lanyard and accompanied by a drop-in charger for daily battery maintenance.
  
  

• Where should I position the Crescent for best results?
  
  

  It should be worn around the neck with the top of the microphone positioned at the collarbone.
  
  

• How often should I charge my microphone?
  
  

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

• How do I connect a personal FM unit to my classroom system?
  
  

  The personal FM transmitter is patched with a cord from the mic jack or aux output to the mixer auxiliary output on the front of the 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 personal FM receiver that the student is wearing or has on the desktop. All teachlogic amplifiers’ have again control on the front panel next to the output to adjust the volume.
  
  

• How 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.
  
  

• Why 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.
  
  

• What 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.
  
  

• What 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.
  
  

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

  TeachLogic has three options for portable Audio. For regular classroom use, many teachers prefer to use the Quantum II for infrared wireless transmission. This system uses the same Crescent 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. If you need to amplify a room that is larger, has cathedral ceilings, multiple large windows or if you need to use the system outdoors, TeachLogic has two systems available. The Spartan 30 watt battery powered system is frequency agile and has 96 UHF frequencies to choose from, reducing interference issues. The Spartan is available with one wireless receiver and built-in USB M3 player. TeachLogic also offers the Titan 50 watt UHF battery powered system which uses the same 96 UHF frequencies and the Spartan system. The Titan is available with up to two wireless receivers, CD+MP3 player with remote control and a unique AirLink wireless transmitter that transmits the composite program signal to as man wireless powered companion systems as needed (Spartan or Titan systems).
  
  

• Does TeachLogic sell rechargeable batteries?
  
  

  Yes, we use Duracell 2650 mAh nickel metal hydride with a one-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.
  
  

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

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

• Can 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.
  
  

• What is the expected life span of a classroom sound-field system?
  
  

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

• I 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 II is a two channel system.
  
  

• Does TeachLogic have a product catalog?
  
  

  We have a full line Full Line Brochure and individual product brochures available for download or we can mail them if you prefer.
  
  

• Who 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.
  
  

• How much maintenance is involved?
  
  

  The system is maintenance free, however, the Crescent, Pendant, Body-Pack and Handheld transmitter batteries need to be charged nightly.
  
  

Order Information

• How 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.
  
  

• I’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.