Input sensitivity question

Discussion in 'Amps [BG]' started by LowEZ, Apr 7, 2014.


  1. LowEZ

    LowEZ Supporting Member

    Joined:
    Mar 29, 2011
    Location:
    Central NJ
    Preamp output spec: "Nominal 0dBV 1V RMS, Maximum +19dBV 9V RMS"

    Power amp input sensitivity is 1.4V RMS.

    Issues?

    Thanks.
  2. Turnaround

    Turnaround

    Joined:
    May 6, 2004
    Location:
    Toronto Canada
    Disclosures:
    Bass Technician, Club Bass - Toronto
    No real issues, but it depends on how you use it. The higher the output from the pre (up until clipping), the better signal to noise ratio.

    But it will only take 1.4V of input at the power amp to drive it to full output when the gain is set to maximum on the power amp. So if you are sending 9V to the power amp, you will not be able to turn the power amp up all the way.

    The best way IMO to deal with this is to turn up the gain at the preamp until it just starts to clip when you are playing as hard as you ever will. Then back it off a bit. This will give you the best signal-to-noise ratio. Then use the power amp to set your overall volume. Watch for clipping at the power amp. If it clips, then you are operating beyond it's real world capacity.
  3. Bob Lee (QSC)

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

    Joined:
    Jul 3, 2001
    Location:
    Costa Mesa, Calif.
    Disclosures:
    Applications Engineer, QSC Audio
    It means your preamp has more than enough oomph to drive the power amp. As Turnaround said, turn the power amp gain down. Then push a good, strong signal into it so you have fairly optimal signal-to-noise ratio.
  4. LowEZ

    LowEZ Supporting Member

    Joined:
    Mar 29, 2011
    Location:
    Central NJ
    Sounds good. Thanks guys!

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