The non-felt mat delivers much more air around the instruments with greater depth and width. The Boston does the same but to a slightly lesser degree, however, it seems to have more definition. When I exchange the Boston and the anti-felt, I like the one thats playing more than the one that I just listened to. They are both significant upgrades to the original felt mat. ..funny, when listening to the upgrades, the felt mat sounds "wooley". Comparing the non felt to the Boston - The Boston sounds like a top tier solid state amp, and the anti-felt sounds more tubes. Either one is a winner.
