last week I got to try out the panny xr-55.Oh man does it suck! It made my pioneer hpm-100's sound like a shitbox.My pioneer sx-450 kicks its butt.(note:My sx-450 sells for like 20 dollars).For ht its ok but for music HELL NO.It sounds brittle,bright and lifeless.The bass is weak also.My 15 watt pioneer sx-450 has better bass and highs.This amp is a big no no.