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QSC RMX 850 and RBI owners, got a question

Discussion in 'Amps and Cabs [BG]' started by slapinandpopin7, Nov 18, 2005.

  1. hey there,
    Im looking into getting the RBI and the QSC RMX 850, i have seen a ton of people using the exact same thing here on talkbass, so for those people, what kind of music do u play and how loud do u think the power amp is? i need to upgrade my pv nitrobass cuz there just isnt enough power for the shows im doing. thanks

    ps: id be running the QSC with 2 4 ohm cabs, one in each channel for 300 off each side
  2. mrpackerguy

    mrpackerguy Supporting Member

    Jul 3, 2004
    Madison, Wisconsin
    I had that exact set up up until I recently upgraded my poweramp and my pre. It's hard to beat for the money. Reliable, plenty of power and very teakable. I play classic rock covers. I think you'll have plenty of power, especially if you run in bridged mono on the RMX850. I run through Acme cabs and their inefficiency takes away from the volume. I'd think you'd be fine with virtually any other decent cab.
  3. what did u upgrade your pre 2 after the RBI?
  4. mrpackerguy

    mrpackerguy Supporting Member

    Jul 3, 2004
    Madison, Wisconsin
    Kern IP-777 tube pre
  5. orskard


    Mar 17, 2004
    i play in a new rock n roll band, kinda like Jet. I use the RBI into a QSC PLX 1202. I was going to buy the lower model of QSC preamp like you have said, but the weight will really get to you, especially once you put it in that rack case. Look around on ebay if you can and just wait for a deal, you can pick up a PLX for a little bit more if you just wait.
  6. LiquidMidnight


    Dec 25, 2000
    The QSC is an excellent amp. My RMX850 is loud enough, but I wanted more headroom, so I bought a Crown XLS 602. I'm still waiting to have that goofy reversed polarity cable made for the Crown, so the QSC probaly has about two more shows to play.

    As someone said, the QSC is heavy, but it's not unmanageable. They're built like tanks though. When you put together a rig, one of the most important components is your power section. As with anything in life, there are places where you can cut cost and come out ahead. Buying a power amp IS NOT one of those times.
  7. jwymore


    Jul 26, 2001
    Portland, OR
    I used to run an RBI and a PLX-1602 in bridged mono mode into a Bergantino NV-610. It had plenty of power and was loud enough but I went to an Eden WT-800 because I like the Eden EQ section. To my suprise I actually found the Eden is louder and has more headroom.
  8. sweet deal, thanks alot

    one more question though, could i use the DI from a head into the power amp input, instead of using the RBI? and just use the pre amp of the head.
  9. Juniorkimbrough


    Mar 22, 2005
    Mississippi / Memphis, TN
    Endorsing Artist: Lakland Basses
    I had the exact set up as well. I was using a Peavey Nitrobass run into a 8 ohm Eden 410 cab and it wasn't quite loud enough. I then picked up a RBI and a RMX850 and run it bridged into the Eden cabinet and it's LOUD! I'm now running a Schroeder 1210 with the RBI/RMX850 combo. I play in a alt/country, rock type band with two loud guitarist w/ tube amps and a very loud drummer and I've never came close to making my amp go into clipping.
  10. i was thinkin just getting a cheap GK backline, (like the sound, but power sucks), and use the XLR out from that to the power amp input, just usin a XLR cable. would that work, or would i need to put a Pre between the XLR out on the amp and the input of the power amp?

    thanks in advance
  11. Juniorkimbrough


    Mar 22, 2005
    Mississippi / Memphis, TN
    Endorsing Artist: Lakland Basses
    why not buy a GK preamp? hauling a head AND a poweramp doesn't seem convenient IMO.....a separate preamp is MUCH lighter.
  12. only 1 rack space more, and only 10 lbs more, and cheaper, and ill have a head just to take around for small gigs or recording without having to take the power amp aswell. but the main reason is cuz its cheaper. but will it work? thats what im wonderin about
  13. Juniorkimbrough


    Mar 22, 2005
    Mississippi / Memphis, TN
    Endorsing Artist: Lakland Basses
    if it has a poweramp out, yes it will work

    but cheap does not always equal better...
  14. i understand that cheaper dosnt always mean its better, but i dont really have the money to pay for something more expensive, and i like the sound of the GK anyway. it dosnt have an power amp out, but it does have a DI, so couldnt i just run it out of the DI into the power amps input?
  15. bump
  16. etnops


    Nov 6, 2005
    i'm using my 4 year old rmx850 as a bass amp for 2 x 15" eminence drivers, in an old acoustic slot vented cab.

    i've been using the rmx850 EVERY single day for the last 3 years or so. it's my full range amp for my computer speakers, too. :) i just unplug and take it to practice with me. i haven't had one problem with it so far, and it never gets anywhere near clipping. PLENTY of juice for the application.

    if anything, this thing is built like a tank. rock solid. not one single problem, and i'm very happy. i did replace the stock fan, because it was just too loud when using it to listen to music, etc.
  17. if i got the Fishman Pro EQ bass pre amp, would that be able to drive the rmx 850? i read some threads that said it didnt have a high enough out put, would that problem be fixed if i got something like a MXR micro amp? would i have to put that before or after the fishman? thanks for your help
  18. etnops


    Nov 6, 2005
    the qsc rmx850 has 32dB of gain available. under normal conditions, you'll only need about a volt of input to get things really cooking.

    i've hooked up my behringer bdi21 directly to the qsc, and using a passive jazz bass, and i got just fine output. no problems.

    personally, i like having as much gain as possible, so i run the behringer to an art tube MP preamp (about 70dB of gain) and then into the qsc. makes everything a bit cleaner, and easier. for $50, having 70dB of preamp gain is a SOLID investment and wise idea.

    just a thought.