Apex Junior Sub Amp

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  • jdybnis
    Senior Member
    • Dec 2004
    • 399

    Apex Junior Sub Amp

    Anybody know how to bypass the crossover on ApexJr's "Junior" Subwoofer Amp? Here's the schematic.
    -Josh
  • JonMarsh
    Mad Max Moderator
    • Aug 2000
    • 15298

    #2
    Pin 5 on the connector is the signal input. Feeding a 4558 (nasty little opamp- around since the 70s!) as a buffer. C524 is a passive low pass filter, 1st order. Not much of a crossover. The quick way to convert to full range is remove C524, leave everything else as is. (part of a DC servo feedback setup).

    Hope this helps....

    ~Jon
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    • jdybnis
      Senior Member
      • Dec 2004
      • 399

      #3
      Huge help! Thanks

      Edit: There is another crossover located on the second page. A dual control pot sets the crossover frequency and is connected to pins 6 and 3 on CN1038. Is there an easy way to bypass this crossover too. I only care about removing the lowpass filter on the low-level inputs. If it makes it easier I'm not using the speaker level connections or the line-level out.
      Last edited by jdybnis; 31 October 2005, 19:22 Monday.
      -Josh

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      • jdybnis
        Senior Member
        • Dec 2004
        • 399

        #4
        *bump* not sure if the edit above registered as a new post or not
        -Josh

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