In trying to get the vp180 v4 to play nice with the M80 ti's ,I just want to mention I have tried port plugs on vp180 in misc configurations (1,2 and 3 ports plugged)and did not like any of them...
Too much of the low end was takin away........
Anyone upgrade m80 ti's to V4? What difference did you notice?any other details would be great

denon 991 /M80's /vp150 & 180 /4x QS8's
Velodyne 15"/ Dbox 12"
ps4 benq w1070 -grand view 106" FF