I think the biggest points brought up are probably the exact reasons why I couldn't stand a sub. Placement, cost/quality relative to main speakers, and active sub vs. speaker level and different amps running different speakers. Not least is the cabling as well.
I can imagine that if you really did your homework and found the perfect high quality sub for your speakers to match, the right cables, the right placement and matching amps then I could concur that adding a sub would be a well worthwhile investment. Maybe in the future I'll put my righteous two-channel philosophy to the test. I'll be sure to let ya'll know if I switched sides. ;-)
I can imagine that if you really did your homework and found the perfect high quality sub for your speakers to match, the right cables, the right placement and matching amps then I could concur that adding a sub would be a well worthwhile investment. Maybe in the future I'll put my righteous two-channel philosophy to the test. I'll be sure to let ya'll know if I switched sides. ;-)