If you have a wall mirror, you can place it on the floor. Look from your seating position into the mirror and see if you can see the speakers in the reflection. Move the mirror around. Once you've moved it far enough that you can't see the speaker anymore, that's smallest you want to rug to be.

You can use the same technique on walls to find the first reflection point for treatments.


Pioneer PDP-5020FD, Marantz SR6011
Axiom M5HP, VP160HP, QS8
Sony PS4, surround backs
-Chris