Thanks Steve
The subs are passive sub, I bi-amp the front channel of my 7.1 to 5.1.
So the top FCM8 get the high and the sub PCS8 get the low from the 7.1 receiver.
I think FCM8 and PCS8 are a Matrix series, pre 800 series.
I have a matching rear, CM1 CM2, but I dropped one of the CM1
