Originally 2 PSX-R's were used to monobloc the old Cyrus Power amp many many years ago. Then another was added to the old Pre amp , which did sound better when PSX'd.
Then when i upgraded i just kept the 3 of them. To be honest i've never tried listening without them since then as I like the sound the way it is. Probably jusy laziness though.
I am out of season all year 'round
Hear machinery roar to my empty sound
Touch my heart and feel winter
Hold my hand and be doomed forever -