Hi all, I'd like some advice on subwoofer placement for new home theater. It is a downward firing sub, with the port also being downward and has plastic/rubber feet. It is currently placed on carpet, which is over wooden floorboards as it's on the second floor. I'm trying to minimise the vibrations in the floorboards since these are very annoying for anyone underneath. I will be ordering a Subdude, which is an isolation platform consisting of velour covered MDF on top of some platfoam. I've also heard advice saying that Granite can help isolate the sub. If I got some Granite, would this be better placed above the Subdude (sandwiched between the subdude and subwoofer) or below (sandwiched between the subdude and carpet)? The Granite will also have feet attached. Any advice appreciated :) Thanks.