Alan,

1) the mrx is not very good on 4ohm load I have m80's, vp180 + 2 pairs qs8's and this amp is rated @75 watt on 5 channels..but has the hdmi 3d & arc correction + new processing

2) the denon 150@4ohm each channel..real sweet but the denon has no hdmi & manual correction + 10 year old precessing

I don't neeed the 9.2 precessing or the extra features like hd radio .. I mainly use the setup in HT room watch films, 3d, tv + computer & music

7.1.4 * MRX1120 * M100s * 180HP * 4x M3-on walls * 4x M3-IC * dual XV15se * Shakers