Currently pondering the STR vs M66 offering.
How would integrating this with your AVR over an M66 be different? I currently own an MX740; really interested to hear what enticed you to go STR in the end.
M66 cannot be integrated with an AVR, it does not have HT Bypass, it does not have fixed volume per input. And no subwoofers bypass.
STR has all of the above.
You can simulate bypass on M66 by setting a designated analogue input to analogue bypass, and set the volume to 0dB. But then, if you start playing a song on BluOS and forget to lower the volume, what happens then?
Also, if you have subwoofers plugged in M66, they will continue to play, regardless you selected analogue bypass. And more - if you have Dirac Filter on M66 enabled, it is still active on analogue input and the volume is raised by 12dB. A forum member
@pogo explained this is the headroom.
All of the above makes the M66 impossible to integrate with an AVR.
Edit: with Anthem STR, you simply designate the input as HT Bypass, plug in the L/R and 2 subwoofers, and all is done. STR does not even need to be on, it works in standby mode.