Hey Fred, check it out the reviewer used Hiromi’s “Beyond Standard” SACD.

http://www.hometheaterhifi.com/power-amplifiers/496.html?task=view&start=2

Again, AFAIK no amp or even receiver other than the XPA-2 w/o the modified protection circuit is having this sort of systemic problem. So even if an impedance graph shows the M80 dipping to below 2 ohms under 20 Hz, and it even mattered as John pointed out, it would only show that what Emo is saying “that the XPA-2 can’t handle loads much below 4ohms with much power” is true.

Also, Emotiva says not to use the XPA-2 bridged to drive anything below 8ohms which is why it sells the XPA-1 for $200 more to do the heavy lifting.

3M80 2M22 6QS8 2M2 1EP500 Sony BDP-S590 Panny-7000 Onkyo-3007 Carada-134 Xbox Buttkicker AS-EQ1