If you can get the stereo sound you want passing through your Marantz, then use identical amplification and the same brand of speakers
for all channels. Certainly don't mix and match. The best test is to select stereo through all speakers. The least variation between channels the better. Levels and speaker distances
must be set accurately. Room correction takes reflections into account, so these settings should be ignored. Rather than use a tape measure, get a laser measurement for each speaker from the primary listening position.
When doing room correction, cover your seating with wool blankets to stop measuring reflections from the seats.
When doing room correction, cover your seating with wool blankets to stop measuring reflections from the seats.