Install Instructions - Williams Sound

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not helpful to the hearing impaired and can contribute to excessive noise in the receiveroutputs. See the section below, Deciding Between Compress Or Limit Settings.If an audio delay is available for use in large auditoriums, it’s usually best to use it.Because radio signals travel faster than sound, delaying the transmitted audio so that anaverage listener (in the middle of the listening area) hears the transmitted audio a fewmilliseconds after audio from the main sound reinforcement system speaker is helpful.This will also help audience members who lip read.The FM hearing assistance system transmits audio with very good fidelity, using thesame technical standards as commercial FM broadcast radio. Its quality is usually limitedby the audio source and by the earphones used with the receivers. Therefore, the audiosource signal should be of the highest quality possible.DECIDING BETWEEN COMPRESS OR LIMIT SETTINGSIt’s easy to select Compress or Limit using one position of the Audio Select Switch. Whenchoosing which mode to use, the system operator should consider the expected audience andprogram material. Figure 8 shows response curves for the compressor/limiter circuitry.A hearing impaired person’s perception of what is “too loud” is usually similar to a normalhearing person’s. However, they often don’t hear soft sounds as well. In other words, theirdynamic range is reduced. To compensate, the T4’s Audio Processor can compress the audiosignal, reducing the dynamic range and making it more useful to the hearing impaired.Some hearing impaired people cannot tolerate as loud a sound as those with normal hearing.When accompanied with hearing loss, their dynamic range is significantly reduced, both forsoft and for loud sounds. Compression is especially useful for these individuals.In some situations, however, such as concerts, compression is annoying to listeners—especially musical purists. Limiting provides control of the modulation level and isoptimized to cause a minimum of disturbance to the sound. It’s acceptable to the mostdiscerning listeners, but not as helpful to hearing impaired people as compression.FIGURE 8: T4 AUDIO PROCESSOR PERFORMANCE+100Hard Limiter (Always Functional)RELATIVE OUTPUT LEVEL–10–20CompressLimit–30Audio "-12 dB" Light ONAudio "0 dB" Light ON–40–40–30–20 –100RELATIVE INPUT LEVEL+10 +20Williams Sound ®Helping People Hear15
STEP 5:CONNECT THE POWER SUPPLYThe T4 transmitter is powered by a wall mounted transformer supplying 24 VAC. Plug thetransformer into a suitable 120 VAC outlet and connect the attached cable to the transmitter.The cable connector has a retaining catch which must be installed toward the top of thetransmitter as shown on the T4’s back panel. Though no damage will result, the T4 will notoperate if you install the cable upside down.Neither the T4, nor its power supply, are equipped with a power switch. Because there is no“wear out” mechanism and power consumption is minimal, continuous operation is not aproblem. If you want to control power to the transmitter, connect the power transformer to aswitched 120 VAC supply or a master switched outlet for the entire sound system.STEP 6:ADJUST THE AUDIO INPUT CONTROLPlay a compact disc or other quality audio source through the complete sound system at alevel that is typical of normal operation. Adjust the Audio Input control so that the LevelIndicator 0 dB LED generally lights and the +6 dB LED lights occasionally.16Williams Sound ®Helping People Hear
Page 1 and 2: InstallationGuide &UserManualPERSON
Page 3: FAST SETUP PROCEDUREStep 1Choose a
Page 6 and 7: FIGURE 2: T4 TRANSMITTER CONTROLS &
Page 8 and 9: INPUTThe input can be configured to
Page 10 and 11: DETAILED SETUP PROCEDURESTEP 1:CHOO
Page 12 and 13: STEP 4:CHOOSE AND CONNECT AN AUDIO
Page 16 and 17: ASSURING EXCELLENT PERFORMANCEThe P
Page 18 and 19: shorter knob controls the microphon
Page 20 and 21: FREQUENCY CHANGE INSTRUCTIONSNormal
Page 22 and 23: SUGGESTIONS FOR RECEIVER MANAGEMENT
Page 24 and 25: NOISE IN AUDIO “GROWS” WHEN PRO
Page 26 and 27: audio equipment may offer applicati

Install Instructions - Williams Sound

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