2 preamps 1 power amp, biamping connection?

Discussion in 'Amps and Cabs [BG]' started by [SD], Nov 12, 2005.

  1. [SD]


    Feb 24, 2004
    Ok, i've searched the forum and i haven't found any answers so far.

    I'm thinking of getting a Eden Navigator and a Demeter preamp and a QSC power amp.

    Now let's say i would like to bi-amp the Eden navigator, so i would connect both channels of the QSC power amp to the Eden right? then how the hell do i connect the Demeter preamp ?

    thanks for your answers.
  2. you would need some type of a mixer. i use a rane mlm-42. 1 rack space and up to four channels.
  3. AlembicPlayer

    AlembicPlayer Im not wearing shorts

    Aug 15, 2004
    Pacific Northwet, USA
    there are a number of ways to split your mono bass signal before the preamps.
  4. Oh, I see what you are saying. Yeah, some type of splitter. I thought you needed to combine your preamp signals to run to your poweramp.
  5. [SD]


    Feb 24, 2004
    AlembicPlayer you misunderstood me. I need to combine my preamps output signals (one biamped, the other on full range) into the two channels of my poweramp.
  6. unlined4string

    unlined4string Supporting Member

    Mar 18, 2000
    Baltimore County, Md.
    If you don't need the effects loop of the Navigator you can connect the Demeter line out to the efects return of the Navigator.

    A variant on the mixer suggestion; if you don't need to use both preamps at the same time you can use a signal switcher (A/B box) between the preamps and the power amp. To be sure it can handle line level without degrading the signal, compare the sound going through the A/B box to the sound when going directly into the amp. If you can't hear a differrence you should be OK. A/B boxes aren't mixers, so don't connect both preamps at once (if you have a A/B/Y box).
  7. AlembicPlayer

    AlembicPlayer Im not wearing shorts

    Aug 15, 2004
    Pacific Northwet, USA
    there are a number of ways to go..
    you can split the signal from the bass and feed two separate preamps then into the two separate channels of the stereo power amp into two cabs.

    another way would be to use a crossover before the power amp and send separate high and low signals to each cab..for that, one preamp would do.

    there are other ways to do this as well..

    I use two pres because my bass puts out two signals.

    ** edit** sorry, I posted before I read your last post.**
  8. AlembicPlayer

    AlembicPlayer Im not wearing shorts

    Aug 15, 2004
    Pacific Northwet, USA
    what exactly are you going for?
    do you want to send two separate signals to two separate cabs? are those signals going thru the x-over?
    do you want the second pre for extra tone shaping of one of the signals?
  9. [SD]


    Feb 24, 2004
    well, what i want is. I want the navigator set for finger style with a nice mid-nasal sound. And the demeter for playing with the pick and a mid-scoop type of EQ. I don't know if i will need to bi-amp the navigator to get the sound i'm after, but just in case i need to i want to know what would i need to buy so i can have a big picture of the budget of the whole thing.

    i guess the A/B box shouldn't alter the sound or volume of the signal, but it would lead to a bunch of long cables: 2 from the navigator biamped, another one from the demeter and another 2 cables into the poweramp....kinda messy.

    using the effect loop on the navigator would also biamp the demeter signal which i'm not sure i will like or not.

    i guess the line mixer is the best idea. i'll have to check some rackmount mixers out there.

    But first i'll get the navigator and find out if i really need to biamp to get my sound. Thanks to everyone!:D
  10. Mudbass

    Mudbass Guest

    Are you running the Rane into a preamp and then to the power amp? If so, does the output of the mixer overdrive the input on the preamp? I'm thinking of doing something similar, but I'm concerned about overloading the preamp or getting an impedance mismatch of some sort.
  11. Run the demeter off the tuner out. That is pre-eq.

    Now run demeter out into the aux input.

    To have just the demeter EQ, hit the tuner mute. Demeter is only thing with a signal, nav EQ is bypassed. To get Nav only, turn Aux level all the way down. To blend both, bring aux level up to desired balance.

    If you run mono, no problem. You have to split the demeter output into 2 sigs for auxL and auxR inputs if you want stereo, even though the demeter is mono signal.

  12. D.A.R.K.

    D.A.R.K. Supporting Member

    Aug 20, 2003
    excellent post/info
  13. I run the direct outs from my preamps into the rane mlm-42, then send the mixed signal from the rane to a poweramp and to the house PA. The Rane has an output level control that can take you from low to very hot. I am very happy with the unit. Check out their site...http://www.rane.com/mlm42.html
  14. Mudbass

    Mudbass Guest

    Ah ha, I see. I'm trying to do something different. I want to parallel two effects (Bass Pod and Digitech RP21D) into my preamp. I've tried just plugging both effects into the two inputs on the preamp, but it doesn't like that much. I'm considering getting a rackmount mixer, plugging the effects into that and then running the mixer into the preamp, but I'm not sure how well that's going to work either.