[quote name='stevie' timestamp='1330339776' post='1555780']
And another thing: the OP says the pad made a large difference when playing on a concrete floor. I have no doubt he believes it did, but perhaps someone could explain to me how the airborne vibrations from the bottom of a cabinet could cause several tons of hard, poured concrete to audibly resonate.
[/quote]
Barefaced Dubster, 4 ohms, Peavey Tour 700 700W @ 4 ohms, large school hall, and yes the concrete floor can be made to vibrate In another context, modern concrete floors floated on insulation board will vibrate, try jumping on one, you can feel the movement. Resonance ???, maybe in a spare 5 mins I will do the maths of Chladni plates with constrained boundaries, then again red wine is calling.