LCA16
LOGIC CONTROLLED AMPLIFIER*
OPERATING INSTRUCTIONS
and trouble-shooting guide
LECTROSONICS, INC.
Rio Rancho, NM
* US PATENT NUMBER 5204908
Page 1: ...LCA16 LOGIC CONTROLLED AMPLIFIER OPERATING INSTRUCTIONS and trouble shooting guide LECTROSONICS INC Rio Rancho NM US PATENT NUMBER 5204908 ...
Page 2: ... drive external amplifiers Each of the 16 output channels in the LCA16 provides 5 Watts into a 4 Ohm speaker 3 Watts into an 8 Ohm speaker and a balanced line output A straight forward switch matrix allows each individual output channel to be attenuated by any combination of the 16 logic inputs The LCA16 has integral power supplies and is designed for mounting in a standard 19 inch equipment rack ...
Page 3: ...equipment The logic input signal conditioning circuits are specially designed to accept a wide variety of logic signals ranging from relay contact closures to TTL logic levels Each logic input passes through a time constant circuit with hysteresis This guarantees minimum signal chopping caused by changing attenuation during pauses in speech Photo conductive opto isolators are employed to switch th...
Page 4: ... Channels 1 16 Indicates the output channel is at the B attenuation level 0 1 2 3 4 5 6 7 8 9 LECTROSONICS INC LOGIC CONTROLLED AMPLIFIER AUTOMATIC SPEAKER LINE OUTPUT CONTROL P O W E R SI GN AL P R E S E N T P O W E R MAIN L EVEL 10 ATTENUATION MODE LCA16 CH 3 ON A B ATTENUATION CH 4 ON A B ATTENUATION CH 7 ON A B ATTENUATION CH 8 ON A B ATTENUATION CH 11 ON A B ATTENUATION CH 12 ON A B ATTENUATI...
Page 5: ... 3 O P 3 P P P P P P P P P 4 4 P 4 4 4 4 4 4 4 E 4 4 4 E 4 4 4 E 4 E 4 4 4 E E E E E E E E E E E E 3B N N 5 N 5 3B N 5 N 5 5 N 5 N 5 3 B N 5 N 5 5 N 5 N 5 N 5 N 5 5 N 5 N 5 0 3 B 5 N 5 5 6 6 6 6 6 6 6 6 6 6 0 5 0 5 6 6 0 5 6 6 6 6 6 6 6 9 9 7 7 9 7 7 7 7 7 9 7 7 7 7 7 7 7 7 7 7 7 7 8 8 15 8 8 8 8 8 15 8 8 8 8 15 8 8 8 8 8 1 5 8 8 8 1 1 0 5 1 1 9 1 1 0 5 1 1 9 1 1 0 5 1 1 9 1 1 0 5 1 1 2 2 9 2 2 1 ...
Page 6: ...IRE REPLACE ONLY WITH SAME TYPE 1 1 2A 250V SLO BLO FUSE 120V AC 200 WATTS US PATENT PENDING S ER NO LECTROSONICS INC RIO RANCHO NM USA R F U S E FU S E F U S E MADE IN USA RI O RANCHO NM LECTROSONICS INC S T U P N I AUDIO THRU 8 7 6 5 16 15 14 13 AUDIO INPUT C I G O L 4 3 2 1 12 10 9 CAUTION 8 7 6 5 9 10 11 12 4 3 2 1 SPKR OUT LINE OUT SPKR OUT LINE OUT LINE OUT M AY BE U SE D CLA S S 2 WIRING 60...
Page 7: ...rting with 1 STEP 3 On your LCA16 SYSTEM WORKSHEET assign the microphones to logic inputs in the first column on the left Simply transfer the microphone numbers from your floor plan to the crossed boxes See Example 1 STEP 4 Assigning Attenuation Levels In this step you will be noting in each box how much the speakers will be affecting each microphone 4A Start with the box where the SPEAKER 1 colum...
Page 8: ...cate how the switches will need to be set according to the worksheet DOT INDICATES ON CONDITION Assigned Mics 7A 7B 8A 8B SPEAKER 0 5 1 2 9 15 OPEN OPEN OPEN OPEN OPEN OPEN OPEN OPEN 1 2 3 4 3 7A 4 5 1 2 3 7B 0 5 2 A B 6 9 7 15 8 B A 0 5 9 10 9 15 11 LOGIC 8A B 12 13 3 8B 0 5 14 9 15 15 16 Figure 7 Example 2 STEP 6 Make your initial settings for the A and B levels of attenuation If you have not ye...
Page 9: ...and 2 are both affected by the same speaker then you can assign both mics to logic input 1 see Example 3 These logic input assignments will assist you when wiring the twisted pair wires from your logic connections on the automatic mixer to the logic connections on the LCA16 Repeat this step for each group of microphones 1 1 5 3 A B B A B 2 4 Assigned STEP 4 Assigning Attenuation Levels In this ste...
Page 10: ... input 2 The illustrations below show how the switches will need to be set according to the chart DOT INDICATES ON CONDITION Assigned Mics 7A 7B 8A 8B SPEAKER 0 5 1 OPEN OPEN 9 15 7A OPEN OPEN 0 5 15 0 5 15 0 5 15 7B 8A 8B OPEN OPEN OPEN OPEN 2 1 2 3 4 3 1 2 3 4 5 2 B A 6 7 9 8 B A 9 9 10 LOGIC 11 12 13 14 3 B 9 15 16 Figure 9 Example 4 STEP 6 Make your initial settings for the A and B levels of a...
Page 11: ...UT on the LCA16 as ground and the LOGIC INPUT on the LCA16 as signal or hot Internally the LOGIC INPUT on the LCA16 is connected through 100k Ohm to 5 Volts so any logic output or other contact system which is interfaced to the LCA16 must be capable of sinking 50 microamps of continuous current The LOGIC INPUTS of the LCA16 are active low Speaker Connections Electrical connections to the SPKR OUT ...
Page 12: ...PMENT 4L01 120V AC 200 WATTS US PATENT PENDING R MADE IN USA RI O RANCHO NM LECTROSONICS INC S T U P N I AUDIO THRU 8 7 6 5 16 15 14 13 AUDIO INPUT C I G O L 4 3 2 1 12 10 9 9 1 0 11 12 S P K R O U T LINE OUT S P K R O U T LI NE O U T LI NE O U T L CA 16 OU TP U T MO D UL E AM 4 1 3 14 15 16 S P K R O U T LINE OUT S P K R OUT L IN E O U T LINE OUT S P K R O U T L IN E O U T S P K R O U T L IN E O ...
Page 13: ...the speaker zones Select a zone in the central part of the room and activate a microphone within it Gradually increase the MAIN LEVEL on the LCA16 until an adequate volume is achieved If feedback occurs before adequate gain can be achieved increase the attenuation level of the speakers near the open microphone and then continue to increase the sound system level If additional attenuation is requir...
Page 14: ...tput Connectors Terminal Strip Load Impedance 4 Ohms or greater Protection Short circuit Open circuit Thermal Excessively reactive load THD 20Hz 20KHz Less than 25 5 watts 4 Ohms 80KHz filter IMD 60Hz 7KHz Less than 25 5 watts 4 Ohms 80KHz filter Noise 20Hz 20KHz Less than 75dBv Gain control at unity Line Output THD 20Hz 20KHz Less than 05 4dBv IMD 60Hz 7KHz Less than 05 4dBv Noise 20Hz 20KHz Less...
Page 15: ...n exact quotation We will be happy to quote approximate charges by phone for out of warranty repairs RETURNING UNITS FOR REPAIR You will save yourself time and trouble if you will follow the steps below A DO NOT return equipment to the factory for repair without first contacting us by letter or by phone We need to know the nature of the problem the model number and the serial number of the equipme...
Page 16: ...nce Total Power Available Load Power Wire Loss 25ft 4 9W 4 8W 1W 50ft 4 8W 4 6W 2W 100ft 4 6W 4 2W 4W 250ft 4 0W 3 2W 8W 22 AWG Wire 8 ohm load Distance Total Power Available Load Power Wire Loss 25ft 2 9W 2 7W 2W 50ft 2 7W 2 5W 2W 100ft 2 5W 2 1W 4W 250ft 2 0W 1 3W 7W 20 AWG Wire 8 ohm load Distance Total Power Available Load Power Wire Loss 25ft 2 9W 2 8W 1W 50ft 2 8W 2 6W 2W 100ft 2 7W 2 4W 2W ...
Page 17: ...APPENDIX 2 LCA16 SYSTEM WORKSHEET Assigned Mics DIPSWITCH SETTINGS SPEAKER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 LOG IC INPUT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16 ...
Page 18: ...evelop we will at our option repair or replace any defective parts without charge for either parts or labor If we cannot correct the defect in your equipment we will replace it at no charge with a similar new item We will pay for the cost of returning your merchandise to you This warranty applies only to items returned to us shipping costs prepaid within one year from the date of purchase This war...
