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GK 400RB Watts?

Discussion in 'Amps and Cabs [BG]' started by MIMJAZZ, Aug 2, 2012.



    Dec 13, 2009
    Chicago, IL
    I've been looking for a new head. I wanted something classic and professional sounding. I found the GK 400RB head and Ive heard sound samples that blew my mind. Its only 280 watts though. That's not very loud at all. How do people get a lot of clean volume from a low wattage amp?
  2. cableguy


    Jun 4, 2009
    North Bend, WA
    The 400RB is 200 @4 ohm and the 400RB-IV is 280 @ 4 ohm. If you have a 4 ohm 4X10 or 8X10 cab it will get pretty damn loud. Through an 8 Ohm 1x15 not so much, for my band at least. They're great heads if they meet your volume requirements. The 400RB also doen't have a built in DI. The 400RB-IV does.
  3. will33


    May 22, 2006
    Watts don't make volume, speakers do. Yeah, the 400rb is a great amp. Sort of like a little brother to the 800. Through an efficient (high spl) cab, they can get plenty loud. As with most GK's, they're real watts, with oomph behind them. Sound more powerful than a lot of stuff labelled 200 watts. A blues jam I used to go to now and then around here, the house rig was a 400rb and a Dietz 215. That's basically a pair of EV tl606's in one box loaded with 15L's. High spl, loud speakers. It was plenty.


    Dec 13, 2009
    Chicago, IL
    I thought if you had a head running at 4ohms you needed a 8ohm cabinet to piggyback with?
  5. DerTeufel

    DerTeufel Supporting Member

    Nov 11, 2011
    Wildomar, CA
    You either need ONE 4 ohm cabinet or TWO 8 ohm cabinets.


    Dec 13, 2009
    Chicago, IL
    If I had the 4ohm head, got a 4ohm 4x10 cab, I would need a new 4x10 cab to add a 1x15?
  7. DerTeufel

    DerTeufel Supporting Member

    Nov 11, 2011
    Wildomar, CA
    The head can either run at 4 ohms or 8 ohms. If you already have a 4 ohm cab, you can't add anymore cabinets. You would need to get an 8 ohm 410 to add an 8 ohm 1x15.

    Side note, you'd be better off with two 8 ohm 410's vs a 410 and a 115.


    Dec 13, 2009
    Chicago, IL
  9. will33


    May 22, 2006
    amps send power, speakers recieve it. You can chain along as many speakers as you want as long as you don't end up below 4 ohms. Usually, this means one 4ohm cab or two 8ohm cabs. Usually the two 8ohms cabs is better/louder.
  10. srayb


    Oct 27, 2010
    Ontario, Canada
    I've been using a 400RB for many years. Plug it into a 4-ohm cabinet and it is plenty loud enough. Used it on many gigs with a Peavey 1516 (4-ohms). Sounds great.
  11. 200w is plenty to rock a good sized bar with good cabs. Extremist metal with no consideration for anyone's hearing excepted.
  12. I played the original 400RB for maybe 3 or 4 years with no real need for any more volume. With a 4x10 it'll do most small or medium stages, with more speakers it'll handle medium so large stages. Cavernous stages and outdoor you might need more.


    Dec 13, 2009
    Chicago, IL
    If I got the 700RB with a 4x10. It will be louder.
  14. johnnynitro


    Jan 14, 2012
    I had a GK400rb with a Hartke 4x10 Always had more than enough power !
  15. Just a little. Speakers convert amp voltage into sound. There's a limit to the useful amount of sound you can get out of one cab. Two cabs on the 400 is louder than one driven to an inch of its life by 700.
  16. tjh

    tjh Supporting Member

    Mar 22, 2006
    ... or, you could look into a GK 800RB with the 4 ohm 410 ... that would be 300 very loud watts into the 410 ... and, if you found you ever needed more you could look for a (matching) 8 ohm 210, and run that off the 2nd power amp in the 800 to increase your set-up to a 400 watt 610 ...

  17. Dave W

    Dave W

    Mar 1, 2007
    White Plains
    If by louder, you mean more wattage. Yes.

    As mentioned many times, wattage does not = volume. Example? The Ampeg SVT (that many people think is insanely loud) is "only" 300 watts.
  18. 400 rb+4 ohm 2X12=happy me!:D:D:D I feel the GIVE technology in gk RB amps provides both great volume and a juicy tone.
  19. Eckie


    Jan 14, 2004
    Edinburgh, UK
    I had the 1x15 combo version and it was plenty loud enough even for medium sized halls. Sometimes I added a 2x10 and it was even better and so deep.
    Unless you're playing very big halls or outdoors, the RB400 should be fine.
  20. throbgod13


    Mar 26, 2005
    the 400RB is quite powerful.. find a good cab(s) to match with it.. the GK Neo 412 in 4 ohm would be a really good match..

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