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How do you keep a cab from rocking on carpet.
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Xiaou2:
Ummm, I would not use any spikes!   A speaker stays in place.  But a cabinet will be rocked... and when that happens.. it will tear up the flooring like you wouldnt believe.

 You probably are using an LCD for the display.  Typical cabs used CRTs, as well as much more wood, due to the needed depth.   This mass was far more than enough, typically, to hold the cabinet in place.

 A person putting their body into play.. can easily get a 200# force output.   Add 2 players.. and you might even double that.

 The best thing you can do, is to get some metal weights... or bags or sand / gravel at the home improvement store.. and place them in the bottom of the cab.

 The only other means of dealing with extreme forces, is by direct connection  (bolting to the floor),   or by absorbing forces... such as a CP that has the ability to move an inch or two in any direction, with a foam/spring absorbing material...  and possibly the cabs bottom, having a counterweight and tilting pivot system, with that same shock absorbing material.

michelevit:
installing casters will solve your rocking problem.
Turvey:
mgb:
So you already have casters in the rear with good beefy
levelers in the front? That's how mine is and it's rock solid, but
my cab is semi narrow with a 27" CRT in it.

I agree with adding weights in the cab. You should be able to get
it good and still.
RandyT:
Good suggestions here.  The dense foam padding and carpet are capable of resisting compression when the load has a larger surface area, and penetrating the padding and carpet with spikes may not be desirable.  So, the only real option is to reduce the surface area of the cabinets points of contact with the carpet and padding, in order to concentrate the weight over the smallest area possible.

One possibility would be to use large carriage bolts, head down, as feet.  This would probably get it stable, but if not, the addition of a couple of sandbags in the base of the cabinet would help.

Just keep in mind that it will very likely compress the padding to the point of no return (i.e dents), and if the cabinet is rocked around a lot, then the carpet will probably be damaged as well.   So enough weight to keep it from moving is a good idea.
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