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- Operating Instructions Manual
Lectrosonics LCA16 Operating Instructions Manual
Summary of LCA16
Page 1
Lca16 logic controlled amplifier* operating instructions and trouble-shooting guide lectrosonics, inc. Rio rancho, nm * us patent number 5204908.
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Introduction thank you for selecting the lectrosonics lca16 logic controlled amplifier. The lca16 is a modular multi-channel amplifier designed to minimize feedback and audio regeneration problems in conference room sound installations using distributed speaker systems. The speakers may be wall moun...
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General technical description in the following illustration is a simplified block diagram of the lca16 showing one amplifier channel. All channels are identical. The audio input of the lca16 is an rf filtered, electronically balanced differential amplifier. An audio thru output is provided so the au...
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Controls and functions - front panel power switch controls the application of ac power to the lca16. Power led indicates the presence of ac power to the lca16. Main level controls the overall output level of the sound system. Signal present led indicates the presence of audio signal to the lca16. On...
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Attenuation dip switches (located behind front panel cover) these switches are used to programs which microphone (or microphones) connected to the 16 logic inputs will trigger the "a" and "b" attenuation levels for each of the 16 output channels. Four banks of switches (eight switches per bank) are ...
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Controls and functions - rear panel spkr out connects to the individual speakers in the sound system. Spkr out (+) is the "hot" terminal, and spkr out (-) is ground. Line out +/ provides balanced line level drive to external amplifiers or other equipment. The line out signal is attenuated identical...
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Pre-configuring the lca16 prior to installation, 16 or fewer mics per lca16 this procedure should be performed prior to installation. The lca16 system worksheet (appendix 2) will assist you in setting up the lca16 before going on site. While the actual setup is quite simple, it is recommended that y...
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1 step 5 - setting the dip switches upon completion of the chart you will have a grid which can now be used for setting the dip switches on the lca16. See example 2 below. Each speaker output on the lca16 has a set of dip switches on the front panel. There are two banks of 16 switches aligned vertic...
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Pre-configuring the lca16 prior to installation, more than 16 mics per lca16 procedure 2 - use this procedure for those installations where there are more microphone channels than logic inputs. The only difference between this setup and the setup described previously is that you have assigned multip...
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1 step 5 - setting the dip switches upon completion of the chart you will have a grid which can now be used for setting the dip switches on the lca16. See example 4 below. Each speaker output on the lca16 has a set of dip switches on the front panel. There are two banks of 16 switches aligned vertic...
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Installation the lca16 is designed to be mounted in a standard 19-inch equipment or cabinet. Adequate ventilation must be provided which can normally be accomplished by leaving at least two open rack spaces (3 1/2 inches) above and below the unit. Generally, the lca16 should be positioned such that ...
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Interconnection diagram l o u d s p e a k e r s l o g i c o u t p u t s l o g i c o u t p u t s l o g i c o u t p u t s - + g n d r t n s n d s n d r t n g n d + - - + g n d r t n s n d l ogic ou tp u t s s n d r t n g n d + d c - d c m ic inp u t 1 m ic inp u t 2 m ic inp u t 3 mic in put 4 au t o ...
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Attenuation settings and speaker system adjustments the steps and procedures in this section should be followed only after all wiring and audio connections have been completed, and the system components have been installed. It is also necessary to complete the worksheet for speaker attenuation and t...
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Specifications audio input: connectors: 3-pin female xlr, electronically balanced and rf filtered impedance: 20k ohms balanced, 10k ohms unbalanced max input level: +8dbv thru output: connectors: 3-pin male xlr, parallel with audio input logic input: connectors: terminal strip impedance: 100k ohms i...
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Service and repair if your system malfunctions, you should attempt to correct or isolate the trouble before concluding that the equipment needs repair. Make sure you have followed the setup procedure and operating instructions. Check out the inter connecting cords and then go through the trouble sh...
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Appendix 1 - power loss vs cable run the table below indicates power loss vs cable run for various wire gauges. Nominal output power for the lca16 is 5 watts at 4 ohms and 3 watts at 8 ohms. 22 awg wire, 4 ohm load distance total power available load power wire loss 25ft. 4.8w 4.5w .3w 50ft. 4.5w 4....
Page 17: Dipswitch Settings
Appendix 2 - lca16 system worksheet a ssi g n e d mi c s dipswitch settings speaker 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 lo g ic i n pu t 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 16.
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Limited one year warranty the equipment is warranted for one year from date of purchase against defects in materials or workmanship provided it was purchased from an authorized dealer. This warranty does not cover equipment which has been abused or damaged by careless handling or shipping. This warr...