Oh, and these things thunder. Running stereo off of a denon avr, and they surprised me. (Don't have the original woofers, unfortunately.) I was running a Quadraflex Reference 650FETR. The first home receiver with MOSFET. Back when Fosgate was starting to make waves in the car audio world. Doesnt sound nearly as good as the Denon though. Their speakers were hand made in Berkeley CA. At at least the older ones. At this point, I am not sure where. It was cool, on the back label, it was hand marked on the mid and treble knob where max flat in a anechoic chamber.