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preamp output problem

Discussion in 'Amps and Cabs [BG]' started by ogar, Apr 13, 2005.

  1. Hi there
    Yesterday, I plugged my Quadruplet to effect return of Clarus, just to try it, and wow! It worked! Clean and present tube tone, perfectly sitting in the mix. It was not as HiFi as the Clarus alone, but the sound in the band context was way better. Definitely better than Sansamp bass driver with Clarus.

    Maybe it is time to blow off dust off the Quadruplet and try to use this combo regularly. Only thing that is bugging me, that I have to turn the Clarus volume full on and Quadrplet's output almost the same, as the Warwick is notorious not-enough-juice guy. So, here is my question.
    Does anyone of you, dear friends, knows something I can put in between the Quadruplet and Clarus to boost the signal a bit?
    Ideally, it should be small, of flat response and "reasonably" cheap.
  2. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    Putting another device in there for additional gain will also add noise and, unless it is quite pure (ie, probably expensive) may alter the tone as well.

    If you have a good technician available he may be able to juice up the gain of that pre, or even tap into the amp circuitry a stage earlier than where the effects loop does so you can get what you want without adding another device.
  3. Thanks

    I spoke to Warwick technician and been told, that 'increasing output voltage is impossible'. Preamp was designed with low output in mind (it should have some sonical advantages) and there's no way how to juice it up a bit internally (according to them).

    I also tried to plug Quadruplet into the instrument input of the Clarus, but it did not helped much and the sound was not what I was after (maybe it would be tweakable, but I set everything flat and it was kinda mudded)

    So still, if there is some miraculous box, that will boost-and-not-spoil the signal, I am really curious.

    Anyway, thanks for your inputs.
  4. The easiest thing to experiment more with would be the instrument input and the EQ. Definitely use the high gain input and try both impedance settings (mine is the version with the button).

    Otherwise you are going to need some kind of preamp between the Quadruplet and the Clarus, and that could be just about anything with a gain stage, the quieter the better. I've used things like the gain stage on my FMR RNC compressor and those ART Tube MP Pre/DI boxes. You have to find a good balance between the gain you run on the quad and the gain on the intermediate preamp in order to find the least noisy setup that still gets you the gain you want.

    I'd be inclined to work with the preamp that is built into the Clarus before adding another piece of outboard gear.
  5. billfitzmaurice

    billfitzmaurice Commercial User

    Sep 15, 2004
    New Hampshire
    Owner, Bill Fitzmaurice Loudspeaker Design
    The website shows the Quad has an instrument level out. Have you tried that instead of the line level out? If not try it, starting with zero output and taking it up very gradually.

    The output of the line level probably can be tweaked, they just don't like the idea of people messing around with circuitry, especially from a liability standpoint if you get zapped while in there.
  6. remo


    Jan 15, 2005
    I've got a Seymour Duncan Pickup Booster pedal for sale if your interested? It has upto 25dB of clean gain which would work for your application.

    Postage to the Czech Republic would be pretty cheap... You could pay me through PayPal if you have it?? PM me if your interested.

  7. Thanks guys

    Bill: there are only balanced and unbalanced outs, both have equally weak output, nevertheless, I'd check it out once again, just to be sure. Thanks for your time.
  8. Bob Lee (QSC)

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

    Jul 3, 2001
    Costa Mesa, Calif.
    Technical Communications Developer, QSC Audio
    Rolls ProMatch MB15: http://www.rolls.com/new/mb15.html
    RDL FP-UBC2: http://www.rdlnet.com/fp-ubc2.htm (requires an external power supply, like a wall wart)
    RDL RU-LA2D: http://www.rdlnet.com/ru-la2d.htm (also requires external power)
    RDL STA-1M: http://www.rdlnet.com/sta-1m.htm (requires external power and has screw terminal inputs and outputs)
    ATI L200 Line Amplifier: http://www.atiguys.com/l200xlr.html
    ATI MM100: http://www.atiguys.com/mm100.html (with transformer-coupled outputs)
    ATI BI100: http://www.atiguys.com/bi100.html (active balanced outputs)
    Aphex 124A: http://www.aphex.com/124A.htm
    Henry Engineering Matchbox HD: http://www.henryeng.com/matchbox.html
    Henry Engineering Matchbox II: http://www.henryeng.com/Support_pdf/MatchboxII.pdf
    Tascam LA-40MKII http://www.expandore.com/product/TASCAM/preamplifier/LA-40MKII.htm (4 channels)
  9. Thanks guys, you really rocks!!!

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