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Junior Varsity
Power amplifier sensitivity question....
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<blockquote data-quote="Michael John" data-source="post: 49929" data-attributes="member: 830"><p>Re: Power amplifier sensitivity question....</p><p></p><p>Hi Langston,</p><p></p><p>Your comment about built in limiters got me thinking and I looked up schematics for QSC and other amps. I think I've now have an answer.</p><p></p><p>On the schematics I've seen, the balanced input circuitry - typically a couple of op-amps - comes BEFORE the level control (or pot/attenuation). And so the input circuitry needs to have a fairly wide input range, in order that it doesn't clip when the user has the level control significantly below 0dB (to optimise gain structure and/or SNR) and is driving the input harder. (Some schematics show the thermal and clip limiting feedback to this input circuitry also.)</p><p></p><p>I had mistakenly assumed the level controls came first, (like on many consumer products where there's just a pot acting as a voltage divider on the input signal).</p><p></p><p>Thanks!</p></blockquote><p></p>
[QUOTE="Michael John, post: 49929, member: 830"] Re: Power amplifier sensitivity question.... Hi Langston, Your comment about built in limiters got me thinking and I looked up schematics for QSC and other amps. I think I've now have an answer. On the schematics I've seen, the balanced input circuitry - typically a couple of op-amps - comes BEFORE the level control (or pot/attenuation). And so the input circuitry needs to have a fairly wide input range, in order that it doesn't clip when the user has the level control significantly below 0dB (to optimise gain structure and/or SNR) and is driving the input harder. (Some schematics show the thermal and clip limiting feedback to this input circuitry also.) I had mistakenly assumed the level controls came first, (like on many consumer products where there's just a pot acting as a voltage divider on the input signal). Thanks! [/QUOTE]
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