1. Please take 30 seconds to register your free account to remove most ads, post topics, make friends, earn reward points at our store, and more!  
    TalkBass.com has been uniting the low end since 1998.  Join us! :)

Preamps and Power Amps: Will This Work?

Discussion in 'Amps and Cabs [BG]' started by Angel Switch, Jan 17, 2014.

  1. So the concept of a seprate preamp and power amp isn't new to me, but I've never bothered to look into it much, and I don't know a lot about it. I have plans to get the BDDI, which Tech 21 claims is a preamp. This means that I could have my current pedal chain go into the BDDI, then have that run into something like the American Audio VLP-600 Power Amplifier, then out to a cab, right? Or am I missing something?
  2. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    It would depend on the input senstivity of the amp. I did a quick search but couldnt find that figure. From what I did see that looks to be a low end amp.

    If you dont already own that amp, there are better power amps out there for the money IMHO.
  3. As long as the preamp has enough output and the input sensitivity of the power amp isn't ridiculously high, this is an excellent way of amplifying.
    Just make sure you'll crank the poweramp. Because the level pots on poweramps are not controlling the output, but just reducing the input. Meaning - open the poweramp completeley and use the level knob on the preamp.

    I just saw that the VLP can switch the input sensitivity. I don't see any reason this wouldn't work.

    Edit 2:
    Peaveyman was faster... but he's right. It's not the best poweramp there is. And its heavy. You might look into Crown XLR1000 for instance. Or peavey IPR.
  4. Any recommendations? And what makes better amps worth spending more?
  5. bgressman82


    Mar 5, 2009
  6. jimfist

    jimfist "Cling tenaciously to my buttocks!"

    Mar 28, 2011
    Boston, MA (USA)
    What cabinet are you using, and what impedance?

    Spend an extra $130 or so on something at least like this:

    Crown XLS1500 DriveCore Series Power Amp Specifications:

    Minimum Guaranteed Power per channel, both channels driven: 775W, Stereo, 2 Ohms (per ch.); 525W, Stereo, 4 Ohms (per ch.); 300W, Stereo, 8 Ohms (per ch.); 1050W, Bridge-Mono, 8 Ohms; 1550W, Bridge-Mono, 4 Ohms;

    Sensitivity (for full rated power at 4 Ohms): 1.4 Vrms

    I recall reading where some users of the Drivecore series had trouble driving the input to get full power out of the amp. Can anyone comment whether the SansAmp BDDI is a good match?

    From the BDDI owners manual:

    TO DRIVE A POWER AMP: Run the 1/4” Output to the input of a
    power amp, and adjust your stage volume with the Level control of SansAmp
    Bass Driver DI.
    NOTE:When running into the power amp input of an amp or a power
    amp alone, adjust the Level as needed. If you are so inclined, this is the
    time to crank it!
  7. 4Mal

    4Mal Supporting Member

    Jun 2, 2002
    Columbia River Gorge
    Reliability, weight, noise floor, clean headroom (power on tap)are some of the factors. Personally I spell power amp as either Crowm or QSC. Everybody else is far fown the depth chart for me. Just due to experience.

    Another pat ofthat experience us that while rack setups can offer a high watts/dollar spent ratio, they often don't actually sound great. Just loud. To my ear, I seem to have better results with good integrated heads.

    Ymmv and all that...
  8. Dave W

    Dave W Supporting Member

    Mar 1, 2007
    White Plains
    Irony :bag:

  9. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    If you are driving it with the pedal? The Peavey IPR 1600. I would avoide the crown drivecore amps, as they have a poor input sensitivity.
  10. dincz


    Sep 25, 2010
    Czech Republic
    I think "poor" is the wrong word. Their sensitivity is absolutely fine for their intended purpose. What is really poor is the failure of many preamp manufacturers to provide enough output level for users of pre/power rigs.
  11. Jim Carr

    Jim Carr Dr. Jim Gold Supporting Member

    Jan 21, 2006
    Denton, TX or Kailua, HI
    fEARful Kool-Aid dispensing liberal academic card-carrying union member Musicians Local 72-147
    If you don't mind a 45+ lb. amp, look for a used Crest CA6 or CA9. These are the classic lead sleds, unsurpassed for oceans of clean power, reliability, 2 ohm performance, and damping/slam. :ninja:

    Look for used Crest CA6 on ebay. I bought a 10 year-old CA6 in 2006. It is still working perfectly, and gets used 2 or 3 times a week. :cool:
  12. Fender Rumble 410, 4 Ohms
  13. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    I dont. I think its a poor match for the pedal the OP is intending to use as a pre amp.
  14. dincz


    Sep 25, 2010
    Czech Republic
    That I do agree with and would have agreed earlier if that was what you had written.