It would appear the Outlaw amp that you had did not show any problems during testing.
I have to wonder if the Outlaw amplifier is more sensitive to low impedance than the Parasound or perhaps their thermal cutoff limit is set higher to ensure the amplifier's longevity. That is, it may be a "over-safe" safety of the amplifier design rather than a fault.
Apparently after testing, and finding "no problems" they sold the amp as B-stock with no further issues.
I am tending to think that while in use the M80s may drop from their nominal impedance and, while not faulty, were causing the thermal overload in the Outlaw amp.
My Monitor Audios are 6 ohm so they should not have any issues like this.
