Originally Posted by Kal Rubinson
Because spikes couple and transfer energy while foam tends to decouple and isolate.
Ahhhh, so THAT'S why they put spikes under speaker stands instead of foam...so that the speakers will transfer their energy thru the floor!
C'mon folks, it's a simple matter of density of the conductive material X area of coverage. I suspect that spikes would indeed transfer less sound thru the floor below, but I haven't done the appropriate experiments to verify, nor does it appear that anybody else has either. Pull out those SPL meters folks!
Wait a second....those cheap SPL meters aren't very accurate for low bass measurements. Never mind.