I have owned 63's for many years and have listened to them in some other great systems. The purist approach of no sub's is great for some music but frankly doesn't do justice to full range music ie. symphony. You do need a fast sub (if such a beast realy exists) and you do also face trying to match a coned speaker with an electrostatic so the crossoveris equally important. I have stumbled upon the best combination that I have yet heard with a pair of Celestion 6000 subs that also make excellent stands for the quads. The cross-over that came with the subs works very well and for the fun of it, I also had a custom cross-over made that some recording/audiophile guy designed especially created for his studio. The 6000's are one of, if not the only, dipole subs manufactured. I am still not sure which cross-over works best but the sound is well integrated and I do not heard any appreciable loss to the Quads. I have no idea what the 6000's would sell for but at least this should give you another explore. For the true purist, switching a few cables gets you back to where some claim is the 63's true destiny. By the way, you might remember that Quad made some subs as well so maybe its not such a terrible idea. I hate e-male so my phone number is 517-673-8493 and the name is Denny.
