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Volume on passive vs. volume on built in amp.

Discussion in 'Archived Threads 2001-2004' started by Sheldon C, Mar 4, 2002.

  1. Sheldon C

    Sheldon C Second Unit

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    Ok, I've read enough here to learn that when using a seperate amp to power a sub (like the samson powering an svs cs sub) you need to turn the volume or "gain" all the way up. Does the same hold true for a sub with it's own amplifier built in? Do you crank the powered sub to "11" and just adjust the volume on the recieiver?
     
  2. ColinM

    ColinM Cinematographer

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    NO. My buddy did that once, had the volume up all the way and the gain down on the preamp. Not cool.
    The 'Gain' on a pro amp works differently that 'consumer' type volume controls.
    For powered sub-type amps start at -5 on the preamp level trim (or something like 3/4 down on the scale) and the sub amp's volume doun all the way. Play a tone through the sub, and bring up the volume knob until you get the proper level of sound.
    Tweak from there, serve with a lemon wedge.
    [​IMG]
     
  3. GabrielC

    GabrielC Stunt Coordinator

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    What's the reasoning behind turning the dedicated amp gain all the way up, and keeping the receiver low first? I've heard that a lot of amps can't necessarily keep up with their maximum limit and will produce a bad signal to the speaker/sub when it's pushed too hard?
     
  4. ColinM

    ColinM Cinematographer

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    Per instructions that came with my SVS - Keep the receiver's trim down to 25%, and adjust the source amp accordingly.

    Works for me, no noise, no stress. YMMV.

    - CM
     
  5. Ron_L

    Ron_L Second Unit

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    in pro applications, like in a commerical movie theater,

    all the amps are at full gain ( QSC MX Series ) the level is determined by the output of the cinema processor.
     

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