JBL CSMA 180 Operation Manual
Also see for CSMA 1120: Application guide
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Contents
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223.2 Input RoutingThe two channel models, CSMA240, CSMA280and CSMA2120 include a default routing of inputchannels 1-4 to amplifier 1 and input channels 5-8to amplifier 2. The user may also take any inputand have it routed to both outputs by selecting theappropriate switch. For example, if you set switch 1to ON, it will be routed to both AMP1, and AMP2.3.3 Hi-Z SwitchWhen this switch is in the “OFF” position, the amplifier is configured to drive lowimpedance speakers, (4 Ohms ,minimum) The Hi-Z switch will switch in the built-inoutput transformer allowing the unit to drive 70V or 100V speaker systems directlywhen connected to the appropriate output terminals. As an added feature whendriving the high impedance speakers, the system automatically switches in a 70Hzhigh pass filter.CSMA180 and CSMA1120 utilizes a slide switch labeled “HI-Z.” while the CSMA240,CSMA280 and CSMA2120 allows each amplifier output to be independentlyconfigured using the DIP switches #5 & #11.3.4 Phantom PowerPhantom power (27V) can be applied to all mic inputs by turning on the PhantomPower switch. (DIP switch #6 on the CSMA240, CSMA280 & CSMA2120.)3.5 VOX Function Voice activated ducking is availableon input channel 1 of the CSMA180and CSMA1120 and for both inputchannels 1 and 5 of the CSMA240,CSMA280 and CSMA2120. Theaudio input level required to activateducking is set using the trim pot on therear panel. Adjusting in the counter-clockwise direction will reduce thatlevel while the full clockwise setting willdisable the VOX function.21 3 4 5 67 8 9 10 11 12INPUT ROUTING1 - CH1 TO AMP22 - CH2 TO AMP23 - CH3 TO AMP24 - CH4 TO AMP25 - AMP1 Hi-Z6 - PHANTOM7 - CH5 TO AMP18 - CH6 TO AMP19 - CH7 TO AMP110 - CH8 TO AMP111 - AMP2 Hi-Z12 - NC |
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