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Preamps that don't meet power amp input specs

Discussion in 'Amps and Cabs [BG]' started by K Dubbs, Apr 22, 2002.

  1. K Dubbs

    K Dubbs Just graduated from OSU, Go Bucks!

    Mar 16, 2002
    Toledo, Ohio
    I was informed that a few preamps don't meet the +4dB input specification of just about every high quality power amp. One example is the sansamp di box, but i heard it is easiliy modified to output at +4 dB's. Does anybody know if the sansamp RBI has the same output deficiency? If so, is it also easily modified like its stomp box counterpart?
  2. HeavyDuty

    HeavyDuty Supporting Curmudgeon Staff Member Gold Supporting Member

    Jun 26, 2000
    Suburban Chicago, IL
    I haven't noticed any problems with my RBI driving my Carvin DCM1000. I've heard QSC needs hotter drive, however - rumour or truth?
  3. Switchable amps (+4 / -20) really help. But the volume out of the pre amp seems to still effect the front gain stage no matter what you do.

    My demeter always sounded good cranked against a -20 input.
  4. I believe that +4dBu translates to an input sensitivity of 1.23 vrms for the power amp. The QSC 1202 and 1602 will accomodate this, but the higher powered 2402, 3002, and 3402 will not unless the QSC modification is performed on the amp.
  5. steve-o

    steve-o Guest

    Apr 17, 2002
    you can use a sansamp and a power amp to run a rig?
    that is the pre amp?
    well then hey how does it sound with the carvin?
    how loud is it?
    i am only doing small to medium gigs what power amp would you all prefer

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