Ok, I've never owned a HT system before, so I'm quite new at this.  Our living room is going to be all ceramic tile, so we have to lay an area rug down.  My wife and I have finally agreed--we are going to up down a shag rug.
So what is the best material for absorbing sound?  (and please rank these, just in case I can't find the best one for a reasonable price!)
- 100% cotton
- 100% wool
- Mix of wool and cotton
- 100% Modacrylic
- 100% Polypropylene
I want to put a thick pad underneath the rug.  Any suggestions for the best sound absorbing pad??
Thanks! 
