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Substitute for a Gramma pad?

Discussion in 'Amps and Cabs [BG]' started by popinfresh, Jul 26, 2005.

  1. popinfresh


    Dec 23, 2004
    Melbourne, Aus
    Hey guys, for the coming gigs and bandpractices I want to seperate the vibrations from the cab going to my V8. Now, right at this present time, I can't afford (nor know where to get) a gramma pad over here to sit the V8 on, so is there anything else I can put between them that will get rid of the vibration succesfully?

    Just to add, I DON'T want to try putting my V8 somewhere else, as it's generally a hassle and I don't have anywhere good to put it, and the floor is just too low.

  2. bmc


    Nov 15, 2003
    I wouldn't worry about it. People have been running SVT's on cabs for years.

    Try a slab of 1 or 2 inch styrofoam. That'll isolate it.
  3. popinfresh


    Dec 23, 2004
    Melbourne, Aus
    ^^I've got a rattling tube, it's not bust or anything, but I want to stop it from getting that way.

    Styrofoam eh, i'll give it a shot.

  4. Luckydog

    Luckydog Supporting Member

    Dec 25, 1999
    I always use a 1-1/2 or so inch thick piece of foam on top of the cab and under the head. Absotively no vibrating tubes. If you want to isolate the cab from a boomy floor, you don't need no stinking gramma...use a slab of more dense foam, or you can also really cheap out and fold a cardboard carton (like those used to ship guitars) in half, and put the cab on it.
  5. popinfresh


    Dec 23, 2004
    Melbourne, Aus
    When you say foam.. Do you mean soft squishy foam? Or like, styrofoam?
  6. TheEmptyCell

    TheEmptyCell Bearded Dingwall Enthusiast

    Jul 16, 2005
    Belfast, UK
    I'm guessing a hunk of regular like insulation type foam would do the job. Or if you can get that molded stuff they use to ship some thing, that might be even better.
  7. Luckydog

    Luckydog Supporting Member

    Dec 25, 1999
    The foam under the head- softer stuff, more cushiony.
    The foam under the cab- denser, like the stuff inside a lot of computer shipping cartons. Not styrofoam...that stuff just shreds. Sometimes you can find dense foam blocks that form the corners for shipping pallets. They can be removed from the pallet, and glued to a small pice of plywood and act as the "legs" of your homemade gramma. Just look around behind stores in the dumpsters, in shipping rooms, anywhere like that, this stuff is thrown away all the time. Plus, you're saving the environment by not letting those pieces go to the landfill! ;^)
  8. jokerjkny


    Jan 19, 2002
    NY / NJ / PHL
    go to your office supply store or hardware store, and look for some dense foam. should do the trick handily.
  9. Tash


    Feb 13, 2005
    Bel Air Maryland
    Try one of the dense vinyl mats they sell to put in front of cat boxes to keep the litter from getting tracked all over your floor. They're thick enough to provide isolation and no slip on either surface (head or cab).

    No I'm not kidding.
  10. sincity

    sincity Supporting Member

    Oct 16, 2002
    Go to a toy store and pick up the interlocking foam pieces used to cushion play areas for kids.

    They work great, and are easy to cut.

    They look like this:

    Interlocking Floor Pads
  11. Passinwind

    Passinwind I Know Nothing Supporting Member Commercial User

    Dec 3, 2003
    Columbia River Gorge, WA.
    Owner/Designer &Toaster Tech Passinwind Electronics
    My wife took one look at my Gramma, and suggested that her aerobics step pad might be as good or better. It's layered with different density foams, and she may well be right. Sleeping pads like you use for camping work great under amp heads, and are big enough to make a few serviceable pieces.
  12. Joe P

    Joe P

    Jul 15, 2004
    Milwaukee, WI
    That's GOT to be hard on electronics to be sitting on top of a bass cab! It's just GOTTA.

    I couldn't see 'styrofoam'-type stuff being any good at all. You need something like 'foam rubber', like what's inside a chair cushion or something. I've just been using a folded-up towel, but that's only alleviating the vibration a little, I'd imagine.

    Here at the factory I work for, we always put a foam rubber type pad under any testing equipment that we're wheeling-around the shop on a cart. It's such a huge difference - without the pad the thing is bouncing and dancing all over the top of the cart from bumps in the floor AND on the cart wheels - and I mean like bouncing up enough to fly up and completely leave the surface of the cart; WITH it, you can roll the thing around with your hand on top of the piece of gear, and it's amazing how you can barely even feel the bumps, even though the cart is loudly clattering-along the old pitted concrete.

  13. bmc


    Nov 15, 2003
    I've never seen anyone put a layer of foam between an SVT head and cab in 30 years of gigging. I've never done. Never saw the need for it.
  14. Try an overly ripe grapefruit under each corner of the amp. Change often in the summer.

    I gotta believe the vibrations of the cabinet can't do the tubes any good.... I put some soft sorbothane half spheres under my preamp rack when I was running NOS tubes.

  15. Petebass


    Dec 22, 2002
    QLD Australia
    I was just about to suggest that. You can get em from the Reject shop for very little money.

    Do you guys have "Clarke Rubber" down in VIC? If so, check em out. They’ve got all sorts of foam in lots of different densities. You may even want to check with your local upholsterer. The one near my place specialises in Motorbike seats and he has lots of different foam types on hand.
  16. popinfresh


    Dec 23, 2004
    Melbourne, Aus
    ^^Yup, we got a clark rubber and reject shop about 20 mins away. I'll catch the train in (should've today, seens that I had last two free periods off school) tomorow hopefully and have a look around.

    How much money would I be looking at for just some foam or a camping mat? 10 bucks or so?
  17. bmc


    Nov 15, 2003
    What about padded bras? :D
  18. tombowlus

    tombowlus If it sounds good, it is good Gold Supporting Member

    Apr 3, 2003
    Fremont, Ohio
    Editor-in-Chief, Bass Gear Magazine
    They should be banned on account of "false advertising!"
  19. SVT's have shock-mounted chassis. If the 'feet' aren't removed and it's setting on them, the amp is floating on shock pads. I'm not gigging right now, but when I did, for my VR400, I used a quadruple layer of egg-crate foam with the amp secured to the cab using bungee cords.
  20. Reefer

    Reefer Guest

    Mar 9, 2003
    :meh: Does bmc stand for Bra Manufacturing Corp?