Amp Techs: QSC PLX 1202 Not Producing Full Bandwidth.

Discussion in 'Live Sound [BG]' started by 4-stringB, Jul 24, 2016.


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  1. 4-stringB

    4-stringB

    Jun 10, 2010
    Tallahassee
    I recently acquired this amp, had to clear up some issues attributed to age and storage. I've noticed a pronounced lack of highs and mids. I've A/B'd it through several evolutions with other amps/speaker combinations. I've also experimented with the dip switch settings, to no avail. Any thoughts?
     
  2. s0c9

    s0c9 Supporting Member

    Jan 9, 2014
    Ft.Worth/Dallas
    1964 Audio artist, Fractal Audio Beta Tester
    Service call ?
     
  3. Bob Lee (QSC)

    Bob Lee (QSC) In case you missed it, I work for QSC Audio!

    Jul 3, 2001
    Chester, Connecticut
    Former Technical Communications Developer, QSC Audio
    If you have an audio signal generator available, switch off the amp's LF filter and put a steady test tone into it at 50, 100, 500, 1000, 5000, and 10000 Hz. As long as the input voltage doesn't change, the output voltage shouldn't either.
     
    4-stringB and Geri O like this.
  4. walterw

    walterw Supportive Fender Commercial User

    Feb 20, 2009
    alpha-music.com
    what are you driving it with?
     
    Bob Lee (QSC) likes this.
  5. 4-stringB

    4-stringB

    Jun 10, 2010
    Tallahassee
    PV6 mixer. It drives a Peavey IPR 1600 just fine. Full range, crisp and clear. I'm trying to figure where in my sound setup the QSC could fit....if at all.
     
  6. s0c9

    s0c9 Supporting Member

    Jan 9, 2014
    Ft.Worth/Dallas
    1964 Audio artist, Fractal Audio Beta Tester
    sub duty?
     
  7. Bob Lee (QSC)

    Bob Lee (QSC) In case you missed it, I work for QSC Audio!

    Jul 3, 2001
    Chester, Connecticut
    Former Technical Communications Developer, QSC Audio
    I would recommend that you have it checked out to see if the problem is in the amp or elsewhere.
     
  8. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    Dec 7, 2021

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