Bill Waslo has been impressed with what acoustic diffusion does in audio systems. In his view, power amplifiers, cables, DACs, for the moment are all just accessories by comparison. If you want to improve your sound stage by a lot, you should focus on the stage (i.e., the room) itself, not on all the doo-dads that get wired to the stage. That means enough absorption to tame down the boxiness and echoiness of a bare room. To go further in removing the walls as obvious sound sources, enough ambient energy should remain in the room but be diffused. In short: the room has to participate, but it has to be prevented from doing anything to disturb the stereo illusion. In this article, Bill gives some practical solutions to make all this happen.
The CoFusor - Quick! Call the patent office!