After four months of non-stop searching of multichannel amp I finally picked up a 7x200 wpc Emotiva MPS-1 to power my 5.1 all-RTi rig (RTi8, CSi5, FXi3). So now I'm relegating my Harman Kardon AVR 247 to the task of pre-pro until the UMC-1 comes out later this summer. I'm using Signal Ultras to bi-wire the 8's and zingo's bi-amp cable to bi-amp the CSi5. Signal Analog II ICs to hook up the amp to the HK.
I noticed an expansion of the soundstage, better bass response, and increased dynamics, although the improvement isn't as dramatic as I expected it to be. That's not the problem though. I was able to tame the brightness of the tweeters with the HK, but with the addition of the MPS-1 it's back again... big time! I toned the treble all the way down to the max (-10) on the HK but the harshness is still there and is giving me a headache at higher volumes.
I was under the impression that the MPS-1 is a neutral amp, so the only component that might be responsible for this could be the IC. They're brand now and I have probably about 20 hours on them so far. I'm hoping that the harshness would mellow out as the ICs break in, but since this is my first move into separates I don't know if this is even a correct assumption to make. What do you guys think?