Thanks for responding, I appreciate all feedback as I try to nail down an amplifier.
I have a miniDSP and am not thrilled with its performance, it does not always seem to function when repowering on my system. I really do not like the unit at all. The speakerpower amps do seem nice, but the non-plate versions are very expensive.
I know LG has a great rep with the FP series which has incredibly high power output. This unit appears to be stable to 2 ohms per the spec sheet, but we all know that spec sheets can be BS (although some brands are more reliable than others, I assume LG is very reliable).
To many options, the Crest CC 4000 measured very well by a member on one of the pro sound forums, used with a good DSP unit should be good. I cannot find info on the ULF filter frequency for the CC series, sine damping factor is listed from 10 Hz - ? I assume it will go down to 10 Hz. Yes, I could buy a Behringer but I don't like the looks, would really look bad in my equipment rack which is not hidden in a closet. Perhaps its vanity, but much of audio is about perceptions.
Two ears and a brain comprise a powerful acoustical analysis tool, able to extract enormous resolution, detail, and pleasure from circumstances that, when subject to mere technical measurements, seem to be disastrous. Floyd Toole