Hi Dan5555,
Pioneer is a kind of "iffy" brand for 4-ohm loads, based on previous Axiom customer experience with the M80s. The "Elite" designation is no assurance that a Pioneer will drive the M80s.
In the past, Pioneer had a model called the 1015, a mid-line model that used MOSFET output devices and, as Wid indicated, had no problem driving the M80s. My understanding is that Pioneer has changed the design of that model's output stage, and it no longer uses the Mosfets, so I wouldn't recommend it.
Regards,
