GK 1001RB-II Distorting at Low Volume

Discussion in 'Amps and Cabs [BG]' started by Chico16, Feb 4, 2021.


  1. Chico16

    Chico16

    Apr 2, 2012
    Yuma, Az
    Just purchased a Used 1001RB-II from Guitar Center and it just arrived in the mail today. My gigging cab is a GK NEO412, but I keep that in storage. My practice cab is here at home (Behringer BB410) so I plugged into that to test it out.

    Now I know the amp is too powerful for this cab (Behringer rates it at 1000w... we all know it’s not that though) but the speakers start distorting and farting out at very low volume. Not even bedroom loud. Amp sounds beautiful but if I turn it up just a little the A and E string start distorting nasty. Messed with the EQ, added the pad, tried Active and Passive bass - distortion no matter what.

    Thought maybe I blew my cab last practice, so plugged in my 450w Behringer head and the cab sounds fine with that even at loud volume. My next step is to go to storage and test the 1001rb with my GK cab and see if it’s the amp that’s busted.

    My question is: if it sounds fine with the 412, is it normal for a stronger amp to distort a weaker cab even at low volume? Or is there a high chance this amp is busted? I’ll be a little turned off if this means I can only use that head with my gigging cab. I was hoping I could run it with either cab so that I can get some practice time with it.
     
  2. jeff7bass

    jeff7bass Inactive

    Apr 9, 2009
    "If it sounds fine with the 412, is it normal for a stronger amp to distort a weaker cab even at low volume?"
    No. You proved the Behringer cab was fine. Either the head has a problem (likely) or there's something else going on. If the head needs work I hope can can return it for a refund.
     
    BrentSimons and wave rider like this.
  3. mmbongo

    mmbongo I have too many basses. Supporting Member

    Agreed. Sounds like the GK is toast.
     
    BrentSimons likes this.
  4. Chico16

    Chico16

    Apr 2, 2012
    Yuma, Az
    Thanks guys! This is actually good news lol I’m about 2 1/2 hours away from a Guitar Center so I’ll make the drive up one weekend to return it and just order a different one. Might as well look around while I’m there too :)
     
  5. jeff7bass

    jeff7bass Inactive

    Apr 9, 2009
    That's a bummer. They should pay for shipping and send you a new one.
     
    BrentSimons likes this.
  6. Kro

    Kro Supporting Member

    May 7, 2003
    New Jersey
    First thing I'd probably want to check is that you're not distorting the input. I knw you said you tested with the pad, which should rule that out, but do you have a pic of the settings you were using just to be certain?
     
  7. The Thinker

    The Thinker

    Sep 17, 2003
    Chicago, IL
    Hang on—are you familiar with how gain, volume, and the boost knob work on RB heads specifically? If so, and you have the settings right, then I agree it may be a bad head.

    if not, try turning the boost knob all the way down, and make sure the woofer knob is set lower than than the master volume. If it’s clean, you’re probably ok. The boost knob adds gain and distortion, and can distort at low volume if it’s turned way up while volume is way down. Hope I’m explaining it right—it’s worth looking up the manual to understand how it all works.
     
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  8. Kro

    Kro Supporting Member

    May 7, 2003
    New Jersey
    Woofer is master. :) Generally, for the absolute cleanest tone you want maximum woofer, minimum boost, and "low" "volume"... and at some point you may need to dial in a little boost to compensate for such a low volume.

    I'm still assuming there's either an issue with the amp, or something is distorting the input (even before "volume" plays a part).
     
    Last edited: Feb 6, 2021
  9. The Thinker

    The Thinker

    Sep 17, 2003
    Chicago, IL
    Oops, right you are!
     
    BrentSimons likes this.
  10. WayneDupuis

    WayneDupuis

    Mar 9, 2014
    Victoria BC
    Are you plugging straight into the head, no pedals?
    These heads dislike pedals in the front end. Put them in the effects loop instead.
     
    phaty likes this.
  11. Kro

    Kro Supporting Member

    May 7, 2003
    New Jersey
    They dislike what now??? That doesn't make any sense. Some pedals may work better in front, and some may work better in the loop, and many will just come down to personal preference.

    But to say that the head doesn't like pedals in front is just silly.
     
  12. Al Kraft

    Al Kraft Supporting Member

    May 2, 2016
    Northern Virginia
    I'd follow Kro's advice and if you still have an issue, return the head. IME that GK should play well with most any combination of cabs, pedals, and basses.
     
  13. WayneDupuis

    WayneDupuis

    Mar 9, 2014
    Victoria BC
    Yeah it's possible I have another issue related to contacts in the effects loop.
    I was having a similar issue the sound breaking up and rattle from woofers new NEO 4x10 and was pulling my hair out. I plugged straight into the input and issue gone; but I did plug my Warden compressor into the effects loop. I read these heads have a problem with pedals in front of the pre and ass u med.
     
    BrentSimons likes this.
  14. Chico16

    Chico16

    Apr 2, 2012
    Yuma, Az
    I don’t have a pic since I put it back in its box to return, but this is somewhat how I had the settings:

    All EQ controls: 12 o’clock (I EQ after volume)
    Volume & Woofer: 8/9 o’clock
    Boost: 7 o’clock
    Presence & Contour: 7 o’clock

    I changed these settings multiple times with different combinations and always had the same result.

    Yes - I overthink all my purchases so I did LOTS of research on all three knobs and how they interact with each other :)

    Yep straight to the head. I’ve never used pedals honestly. Wouldn’t even know where to start lol
     
  15. WayneDupuis

    WayneDupuis

    Mar 9, 2014
    Victoria BC
    I apologise and take my comment back. I had two blown drivers in NEO 410 that only showed in certain notes. Nothing to do with the head.

     
  16. dougjwray

    dougjwray

    Jul 20, 2005
    Just a wild idea: are your speaker cables good? Were you using the same one(s) with both heads? A bad speaker cable can sometimes make you think an amp is blown.
     
    BrentSimons likes this.
  17. WayneDupuis

    WayneDupuis

    Mar 9, 2014
    Victoria BC
    I brought it back to the store i purchased it from 3 days ago, and used their cables and passive p bass to the same conclusion.
    Long and McQuade replaced it on the spot.
    It's a great combination. 1001rbii NEO 410.
     
  18. Chico16

    Chico16

    Apr 2, 2012
    Yuma, Az
    yessir same cable (GK Speakon that came with my NEO 412).

    Planned my trip to Guitar Center for next Tuesday. Planned to return and order another 1001rb-ii, but i might just settle for a 700rb-ii instead since a bill came up higher than expected and I could use the extra $$. Based on what I read here, the 700rb seems to be powerful enough and some even prefer over the 1001.

    Current band mates keep pointing me towards TC Electronics, but knowing that they are part of the same tree as Behringer I don’t really trust the power rating they market.
     
  19. PraiseBassing

    PraiseBassing Supporting Member

    Mar 6, 2017
    California
    I feel like within the last few days, I read a post about someone having unwanted distortion when they really dug in on a GK, possibly 1001. They found the ground connection inside the head loose. Once tightened, that fixed it for them. That may be something to check if you are comfortable doing it.
     
  20. 808State

    808State Inactive

    Dec 30, 2020
    Sounds like the cab is not the problem.
    I would check the effect send to a different power amp to see if the distortion is
    coming from the preamp or the power amp.

    If the power amp has distortion it could be many things.
    Could be as simple as corrosion on the ouput jacks.
    Or it could be the bias isnt right if the bias pot has corrosion.
    Also could be as bad as a output device has blown open and not popping the fuse.
    Or if there is a soft start or anti pop relay or safety relay in the speaker out signal path.
    The relay contacts could be corroded or have arching pitting.
    Or as simple as a corroded ground connection.
    Or any simple corroded or loose connections in the amp

    Its the internet ...so its always a guessing game.
     
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    Primary TB Assistant

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