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Clean signal boost???

Discussion in 'Amps and Cabs [BG]' started by passive pickup, Nov 26, 2012.

  1. passive pickup

    passive pickup

    Dec 11, 2010
    Plugging my bass (9v emg pups) straight into my power amp (Crown xti1000) gives me exactly the tone i want, but not quite enough signal to push the power amp to war volume. I much prefer this tone to using my Madamp tube pre, or my Ibanez head.

    Is there a simple (cheap!) bit of kit that can boost the guitar's signal to the amp without significantly colouring the tone? Maybe some sort of active DI box or such like?

    A high-end preamp is financially out of the question, and tbh i don't want anything but a slightly stronger signal. I've been trying to get to grips with voltage and impedance matching of inputs/outputs but now i'm more confused than ever...

    Any suggestions would be greatly appreciated!
  2. dincz


    Sep 25, 2010
    Czech Republic
    Art Cleanbox Pro?
  3. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    Even one of the TubeMP line will do the job.
  4. Johnny Crab

    Johnny Crab ACME,QSC,Fame/Hondo/Greco user & BOSE Abuser Gold Supporting Member

    Feb 11, 2004
    South Texas
    Experiement with the MXR 10 band EQ pedal if you can. It will take bass-level to line level on the input and output whatever you want it too without a lot of noise(IMO). This will also allow you the option of some signal shaping later if you want it.
  5. BBE Boosta Grande... I got one for $40 on Amazon.
  6. ThisBass


    Aug 29, 2012
    Changing output resistance of the bass electronic from 10k to 1k increases the level to appro +6dB.
  7. CnB77


    Jan 7, 2011
    You can pretty easily build a transparent boost pedal if you want to go the diy route.
    I believe David from SGD has recommended the Alembic Stratoblaster for just the purpose you mention. I think it can have 22dB of gain.
  8. SirMjac28

    SirMjac28 Patiently Waiting For The Next British Invasion

    Aug 25, 2010
    The Great Midwest
    +1 they really work well and are very cheap used.
  9. CnB77


    Jan 7, 2011
    I feel like that might color the tone too much though
  10. morgansterne

    morgansterne Geek U.S.A.

    Oct 25, 2011
    Cleveland Ohio
    please bear in mind that plugging your bass straight into a power amp is doing it wrong. I'm no tech guru but there's impedance and level mismatching going on. Your power amp wants to see a line level signal and adding a (guitar level) pedal to the signal chain won't fix that.
    A DI (use XLR out) or preamp is in order for you.
  11. RickenBoogie


    Jul 22, 2007
    Dallas, TX
    +1 what you need is a proper preamp.
  12. BeSharp


    May 17, 2011
    Annapolis, MD
    I used to use a Seymour Duncan pickup booster with my vintage P Bass. They're all over eBay for about $50. True Bypass. Built like a tank. Definitely did exactly what you're looking to do.
  13. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    They are like $35 bucks new. You would be amazed at how clean they are, and will have all the boost you need to drive an amp.
  14. passive pickup

    passive pickup

    Dec 11, 2010
    Thanks for all the suggestions and advice, that's a great help! I'm not sure which way to go at the moment, i shall look into all of them. The Art mp sounds like the right thing, i'm just hesitant because i already have a tube pre. Having said that, for the cost there's little harm in trying it. Maybe because it's designed for mic rather than bass-specific it may be cleaner than what i have.
    If i understand correctly, whatever i go for needs to accept a strong instrument level and output around 22dbu without colouring or distorting. That makes me think one of the suggested di or boost pedals may be the way to go.
  15. Arjank


    Oct 9, 2007
    Above Amsterdam
    Years ago (+10) I used such an ART TubeMP for pre-amping my bass. It works well but IMO it does color the sound. Though the unit sounds warm it robs the signal a lot of detail....
    Maybe when upgraded with a nice "hifi" kinda tube like a NOS Philips 5771 it may sound good.
  16. arai

    arai Banned

    Jul 16, 2007
  17. dincz


    Sep 25, 2010
    Czech Republic
    Just a thought. Were you using a passive bass? Could it have been an impedance problem - i.e. the Art's relatively low impedance inputs loading your pickups?
  18. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    Thats a pretty good signal chain. When I do haul out a 4 banger, I am always amazed at how clean my Jazz into my PF-500 and '66 can be.
  19. Arjank


    Oct 9, 2007
    Above Amsterdam
    Nope, EMG pups, 18volts.
  20. two fingers

    two fingers Opinionated blowhard. But not mad about it. Gold Supporting Member

    Feb 7, 2005
    Eastern NC USA
    I didn't know the values but changing the resistor on the bass was my first thought as well. It's your bass only more.