Tube amp sound is dominated by the output transformers- Roger Modjeski hand wound his own. The RM-9 used the Vandersteen 2 in development. An excellent match w and Vandersteen @clio this forum can connect you with what remains of Music Reference inventory.
as for efficiency, so often higher output is just trash - out of phase junk that counts as output.
as for efficiency, so often higher output is just trash - out of phase junk that counts as output.