For HT systems, I can't live without twin subs. For the tube 2 channel (2.1), a single Vance Dickerson Titanic sub is the perfect compliment to a pair of Axiom-like Michaura M66 mini towers or giant bookshelf speakers. These have a similar driver compliment to the Axiom M50s (2x6.5" Axiom type aluminum drivers) and a 3/4" titanium tweeter like the ones used in the old M2s or Merak speakers. I don't know why, but these M66s sound much better than the M50tis I had but sold after listening to the M66s. I think the reason might be the cabinet shape - they are hex shaped, smaller than the M50s, but the mids and highs, to my ears, just sound much nicer. They are only rated down to 45Hz /3db (I think) but throw an absolutely enormous soundstage, image beautifully, and have mids which are the perfect match for a 5 wpc SET tube amp.
