Originally Posted By Hector
Yes 861v4 has ID40 and LPS and I have run this to DSP5200SL and found little difference with MS600 using Sooloos. 861v4/ID40/LPS is marginally better but room acoustics were also different.
So, just for clarity, you haven’t tried the 861v4/ID40/LPS in place of the MS600 in the same room/acoustics?

818v3, DSP7200.2, HD621, Oppo BDP-105, Sony VPL-HW55ES projector, Kimber Mains Cables, Russ Andrews Rack and Mains Filtration, GIK Room Treatments