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Head keeps rolling off my cab?

Discussion in 'Amps and Cabs [BG]' started by creis2, Jan 28, 2013.

  1. creis2


    Nov 11, 2011
    Cambridge, MA
    I never had this problem before until I started using this specific cab.

    It's a custom LDS 410 with duratex finish. I have my heavy SVT tube head on top. Tried with my Ashdown ABM head, same thing.

    When I play most notes, it doesn't move. When I play C#‎, even at low volumes, the head starts floating off the cab.

    Does anyone think there's maybe an issue with the cab?

    I tried doing this without the casters on, put the cab on thick carpet, tried a friend's gamma pad. Nothing seems to help.

    It not a slight movement, that happens over a set. As soon as I hit that one note, it looks like the head turns into a hovercraft and starts to fly right off.
  2. I kinda want to see this on video, while it sounds terrifying, it also sounds awesome.
  3. wcriley


    Apr 5, 2010
    Western PA
    The cab seems to have a resonance at that frequency.
    Maybe some additional bracing inside the cab would help?
  4. creis2


    Nov 11, 2011
    Cambridge, MA
    I had Don build the cab with 1/2 ply, so there is a ton of bracing inside. :rollno:
  5. BassmanPaul

    BassmanPaul Gold Supporting Member

    Aug 25, 2007
    Toronto Ontario Canada
    We GTA bass players have something in common. I too would love to see an SVT floating above a speaker cabinet!!! :D

    Aside from that I would have to say that if sounds like the cabinet could do with more bracing. Don at LDS knows his stuff so I would talk to him about the problem.
  6. creis2


    Nov 11, 2011
    Cambridge, MA
    Yeah, I've blasted this cab before with no odd noises coming out of it. So I don't think it's bracing.
  7. CL400Peavey

    CL400Peavey Supporting Member

    Nov 7, 2011
    Grand Rapids Michigan
    Have you opened it up and seen what kind of bracing is on the top? There might be something to add that could stop the vibration.
  8. Lazarus.Bird

    Lazarus.Bird Mr. Personality

    Aug 16, 2010
    Yeah, sounds like you're definitely running into a resonant frequency issue. My Dually shakes my Orange Terror Bass around, but it is only 15 lbs. An SVT should definitely not be moving around!
  9. creis2


    Nov 11, 2011
    Cambridge, MA
    Well the SVT doesn't move as violently as the Ashdown, but the head is a tank.

    The Ashdown (which isn't a feather at all), glides like butter.
  10. ev rodriguez

    ev rodriguez

    Jan 18, 2010
    Dude how loud are you playing that it vibrates an svt head off of the cab? Are al of the pets in nearby establishments catching fire too?
  11. Dave W

    Dave W Supporting Member

    Mar 1, 2007
    White Plains
    That's some serious stuff if it's moving an 80lb head! In for video too :)
  12. lokikallas

    lokikallas Supporting Member

    Aug 15, 2010
    los angeles
    Get a slice of dynamat to put under the head.
  13. creis2


    Nov 11, 2011
    Cambridge, MA
    Not loud at all. It was happening at practice with my band, that doesn't play loud at all.

    I'll try to take a video.
  14. enjoi1018

    enjoi1018 Supporting Member

    Apr 18, 2011
    Auburn, AL
    Soft adhesive rubber feet. I have some on the bottom of my power supply, amp, EQ, and small speakers... even on the bottom of this computer.

    They're so sticky that I kinda have to pull up on the above objects to release friction to pic it up. If your amp's still moving after that, you've got an angry cab :D
  15. skychief


    Apr 27, 2011
    South Bay
    This I gotta see! :D
  16. creis2


    Nov 11, 2011
    Cambridge, MA
    I'm def going to post. Since I don;t have any practices or gigs, I have to find time to do it from home. Didn't think this was that unusual.
  17. Dave W

    Dave W Supporting Member

    Mar 1, 2007
    White Plains
    An SVT bouncing around on top of a cab? I'd say that it is!
  18. lowphatbass

    lowphatbass **** Supporting Member

    Feb 25, 2005
    west coast
    Get the type of liner that's designed for the inside of tool boxes, it's pretty grippy and gives a little cushion as well. I'd give this try.
  19. hover


    Oct 4, 2008
    A properly braced cab should not display this behavior (granted, only so much you can do with that thin material, but a tensionned t-b brace should be in the equation somewhere, imo)...the box should not be that "live". That said, expect when all sorted out, that the cab will sound a bit different in the end for it. How thick is the baffle?

    Also, that amount of vibration is doing none of your heads any favors (including the one on your shoulders), so you need to address this soon.
    Also, is the Duratex glossy? That might be part of the issue.

    I too really want to see video. But only with a spotter for the head... ;)
  20. Chef

    Chef Moderator Staff Member Supporting Member

    May 23, 2004
    Columbia MO
    Staff Reviewer; Bass Gear Magazine
    This is -exactly- right.
    Call Don, pronto.
    He would want to know about this, and correct it.