Thats when i was told i could do this by my better half...LOL
Sorry if i seem pig headed about this, but i did state that the 504 WILL drive the M80's...to be honest, the volume may be fine for some people..just not me. Plus i find nothing wrong with the M80's at all..they don't come across as a bright speaker, at least to me.

The 504 has been used HARD for 25 years easy. To think anything in the amp is up to spec..probably not close at all at this point. But it will go upstairs and just drive the Advents or Polks at lower volumes. Which it dose fine.

The QSC was designed to handle 4 ohm loads. It's not a bad amp at all and should work fine with the M80's. I just have to sit here and wait.