Had a pair of Quad ESL 57's. Tried REL Stadium III, Martin Logan Dynamo, Snell and M& K subs. No question the REL was the best match. Fast and easily adjustable so as not to overlap into the Quad range. I agree with Duke on the multiple sub technique. I currently use a pair of Von Schwiekert vs/1. They are great. If I were to use 4 these would be my choice. Although I never got to use them with my Quads. Have not tried that tweter set up but I like the "sound" of it.
