Hi Systembuilder, I currently own the Premier 11a and a Premier 5 which, as I understand it, is pretty much a mono-block Premier 4 (200 W/ch instead of 100 W/ch). The Matrix 804s can demand a lot of current but the Premier 4 should be adequate. I believe that conrad johnson still offers upgrades for the Premier 4. That should tell you a lot about their value.
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1295118312&openfrom&2&4#2
http://forum.audiogon.com/cgi-bin/fr.pl?aamps&1295118312&openfrom&2&4#2