I have now placed 11 E-Mats in my system. It's strange that when I placed 1 additional E-Mat after 10 under my CD player, subpanel box and power transformer, the sound became slightly muddled. I decided to leave no.11 on top of the power transformer, with one under and now two covering the large top. After 1 day I listened again and the muddled sound was absent; instead, replaced with even more focused sound, more of what Kedoades heard with only his 2 mats. Amazing!