Hi John: Yes, this is a 1979 vintage sub-woofer that uses an external amp. Connections are made from the amp to the sub through regular speaker wire. The connection design to the receiver requires a tape in/out loop in the receiver using four RCA plugs...2 for L/R Input and 2 for L/R High Pass Output. The sub is from "Speakerlab" and came with two satellites. It is now working with my M80v3's and an old 1990's Technics 50 watt receiver that I believe is too taxed by the 4 ohm speakers. So I thought to buy a new receiver hoping I can find a way to connect the sub to it.
