I received the upgrade kit -- I believe this has improved the overall clarity, but especially noticing the bass seems less boomy, and I thought I didn't have boom, haha. I'm using two Vandersteen 2Wq's with the Q set at 2, for those who know. IOW it's a tight setting, not loose or boomy. The kit is well worth the price -- not worried at all about the fuse, I've never blown a fuse in 6 years of owning 1.7.