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adding a power-amp to a head

Discussion in 'Amps and Cabs [BG]' started by fenderbluesdude, Oct 5, 2004.


  1. i have the behringer bx3000t and it sounds pretty good but isnt loud enough.

    i am thinking of getting the qsc rmx 1450 power amp

    how would i hook everything up from the behringer to the qsc?

    i am using a 8ohm avatar 2x12

    eventually i will get a bbe b-max and just keep the 1450.
     
  2. brianrost

    brianrost Gold Supporting Member

    Apr 26, 2000
    Boston, Taxachusetts
    BX300T preamp out to RMX line in.

    Done.

    Don't blow up the Avatar.
     
  3. orskard

    orskard

    Mar 17, 2004
    Indiana
    im looking at QSC poweramps too. if i was going to buy one to rack with other things, weather light or heavy, i would go for the PLX just because that are about HALF the weight.

    thats a big deal to me because i move my own gear. i dont know about you but i want to make that as light as possible.

    spend more and save (your back) more.

    >hanus<
     
  4. well i need more power i am 15 i can save my back later.

    my bx3000t dosnt have a pre-amp out!
     
  5. orskard

    orskard

    Mar 17, 2004
    Indiana
    yah, im 17. i know what you mean.


    >hanus<
     
  6. Th9nker

    Th9nker

    Mar 18, 2002
    "well i need more power" "i can save my back later."

    Damn, I keep saying that, now I'm 30....
     
  7. ha
     
  8. johnbegone

    johnbegone

    Sep 16, 2004
    Chicago, IL
    I was condsidering doing this as well. I use an SVT-3 Pro, and I had two 410's hooked up, but I sold one to buy a newer one (which I haven't gotten yet). I was thinking about running the SVT-3 Pro for the 4x10, then buy a separate power amp and running that to an Ampeg SVT-410HLF, so I'd have a ported 810 basically....... it's probably unnecessary though. I'll probably just end up with two matching 410HE's again.
     
  9. Kelly Lee

    Kelly Lee Yeah, I'm a guy! Supporting Member

    Feb 17, 2004
    Marana, AZ, USA
    You do have a line out, its on the front panel bottom right hand corner.
     
  10. Th9nker

    Th9nker

    Mar 18, 2002
    Well first off, I believe that amp is rated at 300 watts @ 4 ohms... So if you are only using your 8 ohm cab, you aren't getting near the peak output... maybe try adding another 8 ohm cab first, a 210 perhaps...
     
  11. so all i have to do is......

    have a instru4emnt cable from the line out on my behringer and lead it to teh back of the power amp.

    behringer ------>qsc------->2x12

    will i still be able to use the eq on my beinger if i use the line out?
     
  12. Dan Molina

    Dan Molina TalkBass Secular Progressive

    Jul 17, 2002
    Murr Town, California
    Arent you suppose to use speaker cables for that?
     
  13. IvanMike

    IvanMike Player Characters fear me... Staff Member Supporting Member

    Nov 10, 2002
    Middletown CT, USA
    from the line out of an amp (NOT the speaker out) to the input of a power amp you use instrument cable
    from the speaker out of the amp to speaker cabinets you use speaker cable.
    from the speaker outs of the power amp you use speaker cable
    in general the eq you use on an amp will be included in the signal from the "line out" (if the amp has a line out)
    but as previously stated, a second 8 ohm cabinet would probably give you a lot more volume
     
  14. Luigi

    Luigi

    Dec 3, 2003
    NorCal
    I have almost the same set up you have. I also found out that my 300w head couldn't keep up with the loud freaks I play with, even when I had a 1x12 and a 2x10 (both Avatar). So I added a QSC RMX1450, now I'm in business. I am also considering getting a BBE B-Max for my main pre and keep the Behringer as a backup.

    Bass >> BX3000T input >>> Line out (instrument cable is ok)>>>> RMX1450 Channel 1 line in >>>> Bridge out (speaker cables) to 8ohm 1x12 and 8ohm 2x10

    You can use your EQ, shape and everything else but the output control on the head.
     
  15. if you have two cabs would you want it in stereo?
     
  16. Th9nker

    Th9nker

    Mar 18, 2002
    what do you mean by "stereo"?
     
  17. jesus christ dude


    your using the amp wrong dude.

    when you bridge it you should be only using one cab!

    when you use stereo you should be using two cabs.
     
  18. DubDubs

    DubDubs

    Aug 23, 2004
    Los Angeles
    No most basses put out a mono signal. When you have 1 cab you want it in brigded mono. For 2 you want parallel not stereo.
     
  19. sorry i got my terms all mixed up
     
  20. Th9nker

    Th9nker

    Mar 18, 2002
    Right...

    So anyway, back to my original point, if you are only running that one 8ohm cab, you are getting only a little over half of the power out of your amp... either try with a 4 ohm cab, or add another 8 ohm caq to get the full 300 watts... then decide if you really need more power...




    As far as "stereo" goes, try a Rickenbacker... :cool: