LightSpeed Technologies 780iR User's Manual
Contents
1. 19 LicHrTSPEED TECHNOLOGIES INC 11509 SW HERMAN RD TUALATIN OR 97062 800 732 8999 WWW LIGHTSPEED TEK COM LightSPEED2. 11 Optional HM 70 Handheld Microphone Transmitter HM 70 Overview HMEZO GOntFolS sore orci oriri araz nre ue CORPER EVER EXT CERERI ES HM 70 Operating Instructions Charging Operation Holding and Positionilhig soccer rein retineant eoe a rt exer erret bein einen Input from External Audio Equipment Output to Personal FM Transmlitter terrere teret Speaker Control E EE Turning Speakers On and Off Controlling the Volume ofthelndividualSpeakers 14 Tips on Using Classroom Amplification esee 15 Five Year Limited Warranty to Original Purchaser Overall System Specifications Troubleshooting Guide rrr Rr eer Heer rie troi ente ia Individual Components and Optional Accessories ULT dictse E 1 LES 780iR Infrared Classroom Amplification System Overview TES 700 PLATINUM Sirin seues WC COE COMPUTER AUK g 540 6o6oNNNNNI eze 0 0 9 9 z ee e 960 eee esEPRz ove eee The LES 780iR Infrared Classroom The LT 70 LightMic is a wireless pendent Amplification System includes the LES style microphone transmitter This two 780iR receiver amplifier LT 70 Light Mic channel rechargeable microphone microphone transmitter SR 70 in
3. nfrared IR Sensor Consider areas of dark color in the room as they reflect less infrared light Sensor mounting locations should be closer to dark areas to improve reception Receiver Place on flat surface close to standard electrical outlet Speaker Refer to the speaker installation sheet that is included with the speaker for placement needs Speaker Wire and Sensor Wire Plenum wire is included for each Ensure the wire length will cover the area from where you hang the sensor and speaker s to where you place the receiver It s optimal to route wire overhead above ceiling tiles if possible In addition wire can be routed down the wall and around the room perimeter secured with heavy staples or wire raceway 3 Speaker s Locate the speaker installation instructions packed with your speaker s Follow instructions and mount speakers s Return to the LES 780iR manual to complete the set up of your system 4 Receiver Amplifier Place the LES 780iR on a flat surface like a bookcase or countertop Ensure that the A VOLUME and B VOLUME knobs are turned all the way down fully counter clockwise and the POWER switch is the OFF position Connect the speaker wire s to the appropriate 1 4 SPEAKER OUT jacks on the back of the LES 780iR Refer to your speaker instructions for additional information Plug the power cord into a standard 110 V electrical outlet and attach the other end into
4. IR 2 indicator light to the left of the B VOLUME knob will glow red when Channel B is selected e When simultaneously operating two microphone transmitters both indicator lights will glow Optional HM 70 Handheld HM 70 Controls daha ele ARIS 1 Power Switch This 3 position verview switch allows you to turn the micro The HM 70 handheld microphone phone on up position mute the transmitter is an optional microphone microphone middle position and that can be ordered from LightSPEED turn off the microphone down posi It can be used alone or in tandem with the tion The red LED above the switch LT 70 LightMic lights when the switch is in the mute or power on positions 2 Channel Select Switch This switch allows you to choose between Channel A or Channel B This switch is set to Channel B at the factory Power Charge LED Indicator 3 Power Charge LED Indicator This two color LED indicator is located directly above the power switch It glows red when the HM 70 is powered IB Power Switch on and glows green when charging side to open 4 Charger Use this jack to connect the charging cable from the 780iR to the HM 70 for daily battery recharging Battery Charging Jack Compartment caution Channel Select Switch Do not attempt to charge alkaline batteries they can overheat and expand creating a significant hazard and damaging the LightMic Gain Adjust This is not covered b
5. and adjust the corresponding speaker volume control s SPEAKER 1 6 to a desired level Turning speaker volume too high can result in feedback when walking under speaker 14 15 Tips on Using Classroom Amplification These helpful suggestions are provided to maximize the successful use of your new LES 780iR Infrared Classroom Amplification System Speak in a natural voice A normal conversational speech level will provide an adequate signal It is not necessary to increase the intensity of your voice the amplification system provides adequate amplification approximately 5 10 dB above ambient room noises Avoid wearing jewelry that may rub or bump against the microphone Turn the LightMic off during private conversations with a student parent or other classroom visitor You can also cover the LED lens on top of the LightMic to block the signal Recharge batteries each night When recharged nightly operating time actual usage for the transmitters will last through a typical school day Your rechargeable batteries will last for a normal school year when cared for properly caution Do not attempt to charge alkaline batteries they will overheat and expand creating a significant hazard and damaging the transmitter This type of damge is not covered under warranty Five Year Limited Warranty to Original Purchaser The LightSPEED LES 780iR Infrared Classroom Amplification Syst
6. 70 around the bottom covering the black infrared sensors encircling the base This interrupts signal transmission from the microphone to the receiver Speak directly into the top of the microphone at a normal level holding the head about 2 inches from your mouth no lower than chin height Input from External Audio Equipment Below are instructions on how to connect an external audio device like a TV VCR CD DVD cassette player or projector Connectan RCA cable from the audio source to one of the four 4 AUDIO INPUT jacks on the back of the LES 780iR using an RCA type male connector If the audio source produces a stereo signal a stereo to mono adapter is required Part AC STM ADPT N With the LES 780iR on adjust the cor responding volume knob on the front to a desired level Output to Personal FM Transmitter um Using a cable with a 3 5 mm connector at one end connect the FM OUT or AUX OUT to the input jack of an FM transmitter recorder or other device It is important to determine the size and type of audio input jack on the device as many manufacturers products differ The LightSPEED LES 370 requires the CA MMC3535 cable N With the LES 780iR turned on adjust the FM OUT or AUX OUT volume on the back of the LES 780iR to a desired level Speaker Control The LES 780iR has six individual speaker outputs each with its own on off switch and volume control By zoning or se
7. B If you are using a single microphone transmitter for your system we recommend using Channel A 3 Power Charge LED Indicator This triangle shaped LED is two color It glows red when the LightMic is powered on green when charging and goes out when fully charged Charging the LightMic The rechargeable NiMH batteries must be fully charged before regular classroom operations AD ES FMOUI AUXOUT L MC CHARGE n O ai 1 Ensure the LightMic is turned OFF The LES 780iR must be connected to AC power in order to charge the LightMic 2 The LightMic s rechargeable batteries are factory installed Plug one end of the charging cable firmly into the jack labeled CHARGER on the side of the LightMic Connect the other end of the charging cable to one of the MIC CHARGE jacks on the back of the LES 780iR 3 The triangle shaped light on the front of the LightMic transmitter glows green when the cable is connected and charging correctly The light goes out when fully charged 4 The batteries will fully charge in 8 to 12 hours 5 It is best to leave the LightMic charging until used since the batteries slowly lose their charge when not in use However do not leave the LightMic plugged into the charger for more than 10 days as it will significantly shorten battery life 6 Once the batteries are charged remove the charging cable from the LightMic 7 NiMH batteries will mainta
8. CR CD TAPE COMPUTER AUX 4 A VOLUME Controls the volume level of the microphone transmitter that is switched to Channel A Rotating the knob clockwise increases output level B VOLUME Controls the volume level of the microphone transmitter that is switched to Channel B Rotating the knob clockwise increases output level E XE EE dde U ae 6 VOLUME TV VCR CD TAPE COMPUTER AUX These knobs control the volume of various audio sources that are connected to their corresponding input jacks on the back panel 7 SPEAKERS 1 6 OFF These ON OFF switches turn the corresponding speaker connected to the same numbered jack on the back of the unit on or off This is used for zoning multiple speakers within the classroom 6 7 Rear Panel Controls t ee ee ces SPEAKERS 1 6 Volume Controls These knobs control the output volume of each corresponding speaker The volume level is preset in the middle position at the factory LightSPEED recommends leaving the volumes at this level for uniform sound throughout the classroom N SPEAKER OUTPUT 1 6 These 1 4 jacks are used to connect speaker cable from the loudspeakers to the LES 780iR 3 DC POWER The LES 780iR uses an AC to DC power converter to supply power to the amplifier 4 FM OUT amp AUX OUT These output jacks send the processed signal to external equipment for example a tape recorde
9. LES 780iR INFRARED CLASSROOM AMPLIFICATION SYSTEM Midi eic AVOLUME BOLME TANCA ye ax EL ii Ta ig e ooconnnmnmi USER S MANUAL LightSPEED Table of Contents LES 780iR Infrared Classroom Amplification System OVEN VIS E EE 1 LES 780iR System Components e ena ewan nean s ewes anena panenan bawana th nenen 2 System Installation 1 npacklhg aosi ennt eame e Ho E Cre n eo ed seas cesis 3 2 LOCATON NN m T T 3 3 Speaker s E 4 Receiver Amplifier an aana a eene naa a aaa tisse anaa 3 b IR Sensor Placement eine eerte E eg aaa anata skill ise 4 a Suspended Ceiling Mount 4 b Walor Solid Ceiling Moliere mii ai yn ii 4 6 LightMic Microphone Transmitter 1 eere tetra to ornnes bac a nein eain 5 7 Testing 5 F rontPanel Controls ette e I Hte is HR eee 6 Rear Panel Contfkols ebrei intente eren T aet e IE basla 7 System Operation Powering theLES 7 SOUR roro adm Nga SE dah rer metet a eerie ceris ve res textus eere tud vao 8 LT 70 LightMic Microphone Transmitter Controls and Connections Charging the LightM G rient NK NANG GONG i oet BONANGAN NEH NAN Tea e NGARANAN Operating the LEightMIC n nre tr ani ae ENTIN Ee e AdjustingVolume Operating two microphone transmitterssimultaneousiy
10. e way down fully counter clockwise 9 CELIT E Individual speaker switches are in the on up position The LES 780iR is connected to a power source Use the enclosed AC DC power adaptor to plug into a standard electrical outlet and connect the other end to the DC POWER jack on the back panel Individual SPEAKERS volume knobs on back panel are set at a 12 o clock position ot S e on nii The power switch located on the left side of the front panel of the LES780iR is in the up position ON The red POWER light on the POWER switch will light when the LES 780iR is on 8 9 LT 70 LightMic Microphone Transmitter Controls and Connections Microphone External Microphone Connector MIC L Clip pn gt ON OFF Switch Power Channel H gt Charge Select Charging LED Switch Connector Indicator CH A B CHARGER 1 ON OFF Switch This switch 4 External Microphone Connector MIC located on the side of the LightMic Use the 3 5 mm MIC jack for the optional turns the unit on or off The red TK 250 headset microphone triangle shaped LED on the front of the LightMic will light when power is on 5 Charger Connector CHARGER Use the jack labeled CHARGER to connect the charging cable from the LES 780iR to the 2 Channel Select Switch CH A B LightMic for daily battery recharging This switch allows for selection between Channel A or
11. em is war ranteed against malfunction due to defects in materials and workmanship for a period of five years beginning at the date of the purchase Batteries and the optional TK 250 Headset Microphone are guaranteed for one year Products will be repaired or replaced at LightSPEED s option during the warranty period Warranty does not extend to finish ap pearance or malfunctions due to abuse or misuse Repairs performed by any other than LightSPEED will void this warranty Our Service Department 800 732 8999 7 a m 5 p m PST will handle all your repair replacement needs If you review these instructions and still have questions write down the serial number and model number of your system and call LightSPEED Technical Services at 800 732 8999 7 a m 5 p m PST Overall System Specifications Carrier Frequencies IR Frequency Stability Maximum Deviation Dynamic Range Signal to Noise Ratio Frequency Response Receiver Specifications Receiver Type Receiver Sensitivity Image and Spurious Rejection Reception Selectivity Squelching Amplifier Specifications Power Output System Total Total Harmonic Distortion Speaker Load Impedance Power Supply UL Listed Dimensions Weight Inputs TV VCR CD Tape Computer Auxiliary IR Sensors 6 Outputs Auxiliary Outputs 2 Speaker Outputs 6 Transmitter Specifications Audio Distortion Spurious Emissions Built in Microphone Battery Pow
12. er 1 year warranty Dimensions Weight External Sensor Power Reception Coverage Cable Mounting Diodes 2 06 2 54 MHz 396 50 kHz gt 80 dB 90 dB 40 Hz 20 kHz 3 dB Superheterodyne 6 uV for 60 dB S N gt 25 dBuV 40 dB 40 kHz Threshold 3 2 uV 12 W per channel 72 W lt 196 20 W 4 Ohms 24 V 2 5 A 18 x 9 x 3 H x W x D inches 7 Ibs RCA Line Level RCA Line Level RCA Line Level RCA Line Level F Connector 3 5 mm 1 4 196 30 dB Uni directional Electret 2 AA NiMH Rechargeable 1 4 x 1x 4 6 W x D x H inches 3 04 oz w batteries By Receiver Unit 360 Ceiling mount 40 ft Plenum rated Co ax Ceiling clip Wall bracket 32 16 Troubleshooting Guide Please go through this checklist before calling LightSPEED Service Department Battery Check Confirm batteries are charged each night With proper charging batteries will last about one school year Transmitters are charged via a jumper cable from the back of the LES 780iR Make sure plugs are secured and in the proper jacks Confirm the green charging light located on the front of the LightMic is on while charging Ensure the LightMic is turned off while charging Hearing Static or Buzzing e If using two LightMics check that they are not set to the same channel If so select a different channel for one of the LightMics Keep the LES 780iR at lea
13. frared is clipped to a lavaliere cord and worn sensor and speaker package This system around the neck or held like a allows teachers to speak at a normal conver standard microphone sational level while being heard clearly by every student in the classroom The LES 780iR is a two channel receiver amplifier that allows the use of two micro phones and up to four audio input sources In addition up to six speakers can be con nected to the LES 780iR ensuring that no matter the size or shape of the room every child hears every word every time LES 780iR Classroom Amplification System Components LES 780iR Receiver Amplifier DN ere M Sevier ve Mes owe Gems ax cH 69 s KOOT LT 70 LightMic Power Supply Microphone Ti itter SR 70 Infrared Sensor Cable RCA Cables SS m NN f SS sy NN 7 SR 70 Infrared Sensor Speaker s _ N Various speakers ae available and are typically shipped in a separate box i plenum rated speaker wire 2 3 System Installation 1 Unpacking Your System Ensure that you have received all of the components to your system Locate the speaker installation instruction sheet that is packed with your speakers Keep ALL packaging materials If the system must be returned it will be quick convenient and undamaged 2 Location Before installing the system take time to consider the placement of your components
14. in their charge for a full day of normal classroom use 8 With proper care NiMH batteries will provide service for at least one year If battery or charging problems occur contact LightSPEED Service at 800 732 8999 caution Do not attempt to charge alkaline batteries they can overheat and expand creating a significant hazard and damaging the LightMic This is not covered by the warranty 10 11 Operating the LightMic a The LightMic has a built in microphone Once the transmitter is switched on the microphone is activated c The LightMic may be used as a hand held mic or a hands free pendent style microphone by clipping the LightMic on the supplied lavaliere cord Place the lavaliere cord around your neck and adjust the length so the top of the LightMic rests on the collar bone o On the side of the LightMic is the Chan nel select switch Slide the switch to the A position If a second LightMic is used for simultaneous operation set one LightMic to Channel A and the second LightMic to Channel B A Slide the ON OFF switch on the side of the LightMic to ON The triangle shaped light on the front glows red indicating the microphone is charged and ready for use e When the LightMic transmitter ON OFF switch is slid to OFE the microphone power is turned off Adjusting Volume Volume is set by adjusting the volume control on the LES 780iR a En
15. lock Individual Components and Optional Accessories LES 780C LES LT70 LES HM70 BA NHT AC TCC7 AC LTCB PS 24V 2 5 IR SR70 MC TK250LTM AC AUDIOCABLE 4 CA MMC3535 CA MMC2535 SPEAKERS Infrared Receiver Amplifier Mixer with built in charger LightMic Rechargeable Microphone Transmitter with lavaliere cord batteries and charging cable Handheld Microphone Transmitter with batteries and charging cable Rechargeable AA Battery Nickel Metal Hydride Charging Cable for LT 70 and HM 70 to be used with 705iR Lavaliere cord for LT 70 Power Supply Battery Charger for 780iR Infrared Sensor with wall or ceiling mounting bracket Optional Noise canceling Headset Microphone to be used with LT 70 RCA Cable Kit for input of audio into the LES 780iR Audio Patch Cable 3 5 mm mono to 3 5 mm mono Audio Patch Cable 2 5 mm mono to 3 5 mm mono Contact LightSPEED at 800 732 8999 for loudspeaker information 18 User Notes Record your system serial numbers and purchase information This is helpful when ordering additional components accessories and or warranty service standard components serial number LES 780iR LT 70 LightMic SR 70 IR Sensor Speakers Power Supply RCA Cables n a optional serial number component HM 70 Handheld Microphone TK 250 Headset Microphone Wall Mounting Shelf
16. p on the back of the IR sensor onto the plastic mounting strip with the sensor plug hanging down if a wall mount or toward the receiver location if ceiling mount Uncoil the sensor wire Insert sensor plug into the female end of the sensor wire Loosely secure wire overhead and route it back to the LES 780iR Connect sensor wire to any of the six sensor inputs on the back of the LES 780iR Complete Step 7 testing to confirm optimum sensor location and permanently secure wire from the sensor back to the LES 780iR note The LightMic rechargeable batteries come installed at the factory There is enough charge within the LightMic batteries to adequately test the system during initial setup However the batteries need to be charged for 8 or more hours before regular use for optimum battery life 4 6 LightMic Microphone Transmitter For testing purposes basic instructions for wearing and operating the LightMic are provided below For more detailed instructions refer to page 11 Clip the LightMic to the lavaliere Place the LightMic and lavaliere cord around your neck and adjust cord length so the top of the LightMic sits just below your collar bone Slide the ON OFF switch on the LightMic to ON The red power indicator will light Slide the channel select switch to A a Testing Test the system to ensure everything is correctly connected and working proper ly before
17. pa rating the classroom into different areas where audio may or may not be de sired the teacher has greater flexibility controlling the dispersion of sound throughout the room Zoning is especially useful in large or odd shaped classrooms While LightSPEED recommends leaving the speaker volume set in the middle position to maintain a uniform sound there may be times when separate volume adjustments are necessary Turning Speakers On and Off 1 Ensure that the LES 780iR is turned off and that A and B VOLUME are turned down 2 Turn the corresponding SPEAKERS 1 6 OFF switch es on the front panel to the on up position 3 Turn the LES 780iR on and slowly turn up the level of A VOLUME Walk around the classroom speaking into the mic at a normal level and ensure that the desired volume is coming from each speaker Do the same with B VOLUME if using a second LightMic Controlling the Volume of the Individual Speakers An area of the classroom may contain a noise emitter such as an HVAC system In this case it may be necessary to turn up the volume of the affected speaker to overcome the noise in that area When his situation arises the LES 780iR allows the user to fine tune the output level 1 Locate the speaker volume control knobs on back panel SPEAKER 1 6 above the speaker outputs 2 If possible have a second person stand by the speaker s needing adjustment 3 Speak into the mic at a normal level
18. r or an assistive listening device like LightSPEED s LES 370 Personal FM System 5 ADJ These knobs control the output level of the audio source being sent out of the unit via the FM OUT amp AUX OUT jacks 6 MIC CHARGE These jacks are used to connect the charging cable to the LightMic or a handheld microphone for daily battery charging 7 FILTERS These speaker filters are cov ered with a speaker indicator label and are factory preset for optimum perfor mance If you have any questions about these filters or their settings please call LightSPEED mg Hee ee gt 1 1 1 T K en 8 AUDIO INPUTS TV VCR CD TAPE COMPUTER AUX These RCA input jacks receive audio input from external audio sources TV VCR CD tape computer etc 9 EQUALIZATION The three frequency equalization adjustments are factory set for normal classroom environment LOW Controls low frequency MID Controls mid frequency HIGH Controls high frequency Pe Gen 000 He 10 SENSOR INPUTS The cable from the IR sensor connects to any of these six inputs Up to six IR sensors can be connected to the LES 780iR for use in large or odd shape classrooms 11 SENSOR SHORT If there is a short in one of the sensor cables this LED glows as a warning signal System Operation Powering the LES 780iR Check that Both front panel microphone volume controls A VOLUME and B VOLUME are turned all th
19. st 6 feet away from computers Low Volume Check volume level on the LES 780iR and adjust as necessary Check volume level on each of the speakers on back panel and adjust as necessary Sound Fades In and Out Drop Out Test LightMic with fully charged batteries LED light on front of mic will glow bright red 17 No Sound From Speaker Confirm the LightMic and the LES 780iR are turned on and have matching channels Check both A VOLUME and B VOLUME to ensure they are set correctly Confirm amplifier power supply is the correct type if in doubt call LightSPEED In addition confirm that the power supply is connected securely in the wall outlet and into the DC POWER connector on the back of the 780iR Turn the 780iR on Confirm that the POWER light located on the front panel switch is on Turn the LightMic on and confirm that the corresponding red IR light located on the front panel of the LES 780iR lights When speaking into the LightMic the green AF light will flash flutter with your voice volume Confirm that the batteries in the transmitter are fully charged When they are the red indicator will glow steadily Confirm that the speaker wires are in the correct jacks on the back of the LES 780iR and confirm that the speaker switch for that speaker output is in the ON position Also confirm that the volume level for each connected speaker is set in the middle position 12 o c
20. sure the LES 780iR is switched ON Jg Ensure the LightMic is switched ON and the triangle shaped LED on the front of the LightMic is glowing red The IR 1 LED next to the A VOLUME knob on the LES 780iR will also glow indicating that the LES 780iR is receiving the LightMic signal and is ready for use o Adjust the volume of the receiver by turning A VOLUME clockwise d Speak at a normal level and slowly turn the volume knob clockwise to increase the loudness of the speaker s until the sound level is adequate for the room note Feedback or squealing may occur if the volume is set too high Reducing the loudness of the speakers with the volume control usually eliminates feedback Operating two microphone transmitters simultaneously The LES 780iR has two independent receivers Channel A and B This makes it possible to operate two microphones simul taneously Follow the instructions below when using a second microphone a Set each microphone transmitter to separate channels For example if you are using two LightMics set one to Channel A and the other to Channel B If you are using one LightMic and one HM 70 handheld microphone set the LightMic to Channel A and the HM 70 to Channel B When the LES 780iR is receiving a signal from the microphoneftransmitters IR 1 indicator to the left of the A volume knob will glow red on the LES 780iR when Channel A on the LightMic is selected The
21. the DC POWER jack on the back of the LES 780iR Switch the power on the front panel to the ON position The red power indicator on the switch will light 5 IR Sensor Placement Sensor location is very important for optimum performance of the LES 780iR Classroom Amplification System Place the sensor in a temporary location and test the system Step 7 below before choosing a permanent location Test the mic at the farthest points from the sensor to confirm signal is clear throughout the classroom Dark surfaces reflect less infrared light and may hinder signal transmission a Suspended Ceiling Mount EP Lift the ceiling tile nearest the grid rail in your desired sensor location Guide one side of the C clip over one edge of the grid rail Providing firm support to the back of the grid rail with one hand to prevent bending firmly and carefully snap the second side of the C clip over the edge of the rail Uncoil sensor wire Insert sensor wire jack into sensor plug Loosely secure wire overhead and route it back to the receiver Plug into any of the six sensor inputs on the back of the LES 780iR Complete Step 7 Testing to confirm optimum sensor location and perman tently secure sensor wire from the sensor back to the receiver b Wall or Solid Ceiling Mount Screw the plastic mounting strip on to a place high on the wall or in the middle of the solid ceiling Firmly snap the C cli
22. y the warranty top view of battery compartment 12 13 HM 70 Operating Instructions Charging Rechargeable batteries are pre installed a Turn off the HM 70 by sliding the power switch all the way down b Connect one end of the charging cable to one of the MIC CHARGE jacks on the back panel of the LES 780iR Connect the other end of the charging cable to the charging jack on the side of the HM 70 The power indicator LED will glow green when the charging cable is connected and charging correctly o The batteries fully charge in 8 to 12 hours Once the batteries are charged remove the charger cable from the HM 70 NiMH batteries maintain their charge for 4 full day of normal classroom use Always turn the HM 70 off when not in use Operation The Channel A B switch is located inside the battery compartment The switch is set to Channel B at the factory a Slide the power switch on the side of the HM 70 all the way up The power indicator LED will glow red and stay on There is a center MUTE position if you wish to leave power on but temporarily cease transmission of your voice b Do not adjust the audio gain adjuster that is located in the battery compart ment It has been preset by factory technicians and is not intended as a volume control Holding and Positioning a When holding the HM 70 grip the barrel in the center silver section below the power switch Do NOT grip the HM
23. your first full day of use A second person is helpful to listen and ensure your voice is clear but not loud With the LightMic positioned properly around the neck speak normally and turn the AVOLUME clockwise until an optimum voice level is achieved You may not be able to hear your own voice when this is properly set However your students will note The system can generate feedback a squealing or howling sound if there is too much volume or the equalization EQ levels are incor rectly set Adjust the three EQ level knobs if necessary to eliminate feedback and to obtain a natural sound With volume and EQ levels set walk around the room paying special attention to the areas farthest from the IR sensor Your voice should remain clear and intelligible Consult the troubleshooting guide for further assistance Front Panel Controls LES 780 PLATINUM Series B VOLUME IR2 AF2 MM POWER Switch POWER Indicator This switch is used to turn the LES 780iR ON switch up or OFF switch down When the POWER switch is in the ON position the red POWER light will glow 2 IR 1 IR 2 The IR indicators IR 1 IR 2 will glow red when the corresponding microphone is turned on This light confirms the LES 780iR is receiving the infrared signal 3 AF 1 AF 2 The AF indicators AF 1 AF 2 flash green when audio voice from the microphone is dectected VOLUME TVN
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