Hi Smuth10,
None of the mainstream AV receiver manufacturers ever specify their products will work into 4-ohm loads. However, through tests at Axiom and lots of customer feedback, the following brands of AV receivers (even the entry-level models of Denon and Sherwood Newcastle) will drive the M80s to quite loud levels in normal sized rooms:
Denon, Sherwood Newcastle, Outlaw Audio, NAD, Rotel, and B&K (I may have forgotten one. . .)
If you have a huge "great room," (6,000 cu. ft or more) or prefer extremely loud, CLEAN, 100-dB+ playback levels, which of course the M80s will reproduce so long as you have amplifiers of several hundred watts per channel, then get a separate power amplifier for the M80s (preferably the Axiom A1400-8!).
The brands of AV receivers that have overly aggressive protection circuitry that will shut down if they detect a 4-ohm load (or if the user moves an impedance switch to the 4-ohm setting) or go into severe current limiting, are: Onkyo, Pioneer, Sony, Kenwood, Yamaha and so on.
And tell Mojo to stop quoting that utterly bogus "dynamic power output" spec, which misleads consumers into thinking their AV receiver will drive low impedances for longer than a few milliseconds!
The only dynamic power output rating that is standardized is expressed in dB, as in "2 dB of dynamic headroom." Virtually no manufacturer ever uses this spec, since the bogus one yields huge power output figures.
Regards,
Alan
