Lightspeed LES 750iR, User Manual

Page 1: ...LightSPEED LES 750iR INFRARED CLASSROOM AMPLIFICATION SYSTEM U S E R S M A N U A L LightSPEED ...

Page 2: ... Step Three Operating the LightMic Step Four Adjusting the Volume Step Five Operating an Optional Second Microphone Simultaneously Optional HM 70 Handheld Microphone Transmitter Overview HM 70 Controls Charging the HM 70 Operating the HM 70 Input from External Audio Equipment Output to Personal FM Transmitter Audio Equalizer Front Panel Controls Rear Panel Controls Tips on Using Classroom Amplifica...

Page 3: ...cro phone transmitter SR70 infrared sensor and speaker package The LES 750iR is a two channel receiver amplifier that allows the use of up to two microphones simultaneously and up to two additional audio input sources such as TV VCR DVD CD cassette PC LCD pro jector etc In addition LightSPEED offers various speaker options that are included with your system to provide optimal sound in rooms of all s...

Page 4: ...assroom Amplification System Components Power Supply SR 70 Infrared Sensor Cable SR 70 Infrared Sensor Various speakers are available and are typically shipped in a separate box with plenum rated speaker wire Speaker s LES 750iR Receiver Amplifier LT 70 LightMic Microphone Transmitter 2 ...

Page 5: ... 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 speaker s Return to the LES 750iR manual to complete ...

Page 6: ...ne 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 Connect one end of the sensor cable to the plug on the sensor Loosely secure wire overhead and route it back to the receiver b Wall or Solid Ceiling Mount Screw the plastic mounting strip on ...

Page 7: ... to ensure everything is correctly connected and working properly before 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 A VOLUME clockwise until an optimum voice level is achieved You may not be able to hear your own voice when this is properly set However y...

Page 8: ... LT 70 LightMic Microphone Transmitter Controls and Connections 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 4 External Microphone Connector MIC Use the 3 5 mm MIC jack for the optional TK 250 headset microphone 5 Charger Connector CHARGER Use the jack labeled CHARGER to connect t...

Page 9: ...2K5 6K3 4K 10 0 10 Turn ON the power switch located on the left side of the front panel of the receiver The red POWER light on the switch will glow To AC outlet System Operation Turn the volume controls A VOLUME and B VOLUME on the front panel are turned all the way down fully counter clockwise Make sure the speakers are securely connected to their binding posts as described in the speaker install...

Page 10: ...t hazard and damaging the LightMic This is not covered by the warranty 1 Ensure the LightMic is turned OFF The LES 750iR 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 th...

Page 11: ... Operating the LightMic 3 On the side of the LightMic is the Chan nel select switch Ensure the switch is in 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 4 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 read...

Page 12: ...the 750iR will flash on and off as the voice volume increases and decreases 3 While speaking at a normal level slowly turn the A VOLUME knob clockwise to increase the volume of the loudspeaker 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 ON ...

Page 13: ...accordingly Repeat with the second microphone c Notice when both LightMics are ON the two IR indicator lights on the front panel of the LES 750iR will glow As you speak into the LightMics both AF lights will blink 1 c ON The LES 750iR has two independent receivers Channel A and B This makes it possible to operate two microphones simultaneously Follow the instructions below when using a second micr...

Page 14: ...lows green when charging 4 Charger Use this jack to connect the charging cable from the 780iR to the HM 70 for daily battery recharging Optional HM 70 Handheld Microphone Transmitter Overview The HM 70 handheld microphone is an optional component that can be ordered with the LES 750iR system This microphone is typically passed around among students so that when they are asking a question or readin...

Page 15: ... to AC power in order to charge the microphone 2 The HM 70s rechargeable batteries are factory installed Plug the smaller end of the charging cable firmly into the jack labeled CHARGER on the side of the HM 70 Connect the larger end of the charging to one of the CHARGE jacks on the back of the LES 750iR 3 The power indicator light next to the power switch glows green when the cable is connected and...

Page 16: ...ent It has been preset by factory technicians and is not intended as a volume control 4 When holding the HM 70 grip the barrel in the center section just below the power switch Avoid gripping the HM 70 around the bottom cover ing the infrared emitters circling the base This could interrupt signal transmission from the microphone to the receiver 5 Speak directly into the top of the microphone at a ...

Page 17: ...ructions on how to connect an external audio device like a TV VCR CD DVD cassette player or projector 1 1 Make sure to turn the AUX 1 and 2 VOLUME controls on the front panel all the way down fully counterclockwise 2 Connect an RCA cable from the audio source to one of the AUX IN 1 or 2 jacks on the back of the LES 750iR using an RCA type male connector If the audio source produces a stereo signal...

Page 18: ...n the corresponding ADJ volume control to a desired level When used with a personal FM transmitter typically this volume control should be left at a low level Audio Equalizer The LES 750iR has a built in 8 band equalizer This equalizer consists of eight sliding controls that adjust the levels of various high and low frequency sounds Because all loudspeakers and class rooms have different acoustical...

Page 19: ...firms the LES 750iR is receiving the infrared signal 3 AF Indicators AF These lights flash green when audio voice from the microphone is detected 4 A VOLUME Controls the volume level of the microphone trans mitter that is switched to Channel A Rotating the knob clockwise increases output level 5 B VOLUME Controls the volume level of the microphone transmitter that is switched to Channel B Rotating t...

Page 20: ...here there may be a learning group or quiet time 3 DC POWER Plug the AC DC power supply into this jack 4 CHARGE These jacks charge the LightMic s and optional handheld microphone with the supplied charging cable s 5 MIXED AUDIO OUT These output jacks send the processed audio signal the external equipment such as a recorder or an assistive listening device like LightSPEED s LES 370 Personal FM Syst...

Page 21: ...p m PST Tips on Using Classroom Amplification These helpful suggestions are provided to maximize the successful use of your new LES 750iR 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...

Page 22: ...hing obstruct ing the lens on the LightMic The LightMic needs to be worn around the neck with the lens pointing out or held in the hand without covering the lens for proper transmission Make sure there is nothing obstruct ing the Infrared sensor The sensor should be installed on the ceiling or high on a wall for proper reception No Sound From Speaker Confirm the LightMic and the LES 750iR are turne...

Page 23: ... LT 70 and HM 70 microphones AC LTCB Lavaliere cord for LT 70 PS 24V 2 5 Power supply battery charger for 750iR LESSR70F Infrared sensor with wall or ceiling mounting bracket MC TK250LTM Optional noise canceling headset microphone to be used with LT 70 CA RCA6 6 dual RCA audio cable CA RCA24 24 dual RCA audio cable CA MMC3535 3 5 mm mono to 3 5 mm mono audio cable CA MMC2535 Audio patch cable 2 5 ...

Page 24: ...otal Harmonic Distortion 1 20 W Speaker Load Impedance 4 Ohms Power Supply UL Listed 24 V 2 5 A Dimensions 18 x 9 x 3 H x W x D inches Weight 7 lbs Inputs TV VCR RCA Line Level IR Sensors 2 F Connector Outputs Auxiliary Outputs 2 3 5 mm Speaker Outputs 4 Binding Post Connectors Transmitter Specifications Audio Distortion 1 Spurious Emissions 30 dB Built in Microphone Uni directional Electret Batter...

Page 25: ... purchase information This is helpful when ordering additional components accessories and or warranty service serial number optional component serial number LT 70 LightMic standard components SR 70 IR Sensor Power Supply LES 750iR Speakers Wall Mounting Shelf HM 70 Handheld Microphone TK 250 Headset Microphone ...

Page 26: ...L I G H T S P E E D T E C H N O L O G I E S I N C 1 1 5 0 9 S W H E R M A N R D T U A L A T I N O R 9 7 0 6 2 8 0 0 7 3 2 8 9 9 9 W W W L I G H T S P E E D T E K C O M ...