I ran my Velodyne DD-15 from BAT-75SE power amp's speakers terminals, and the main speakers from the SAME amp terminals, using spades for one, and bananas for the other.
I don't think, you shoud use 4 ohms term. for the main speakers and 2 ohms for the subs.
Many people prefer speaker level signal to drive sub.
I don't think, you shoud use 4 ohms term. for the main speakers and 2 ohms for the subs.
Many people prefer speaker level signal to drive sub.