I still have a converted SB-220 for sale (pair of 3-500's) >From the estate of WN3SIXI tested it with 40 watts of drive and it produced 800 watts outputWe have now lowered the price to $600If any interest, please E mail off lineLocated near Wilkes Barre, Pa. I don't have boxes so please either a pick-up or meetwa2fgk at yahoo.com73Herb