Hi Michael,
One reason B&W speakers might not work well with SET tubes is not necessary the efficiency, rather that the impedance swings on B&W speakers in general are wide, a 8 ohm nominal speakers can be down to 4.6 ohms. And most SET do not like wide impedance swings.
I was using Cary 300SE signature (15W SET) driving B&W CDM1SE for a long time, extremely happy with the result, now granted, my listening room is small (11X14). I recently changed the speakers to ProAc Reference 8; love the ProAc mid-ranges.
So, all said and done, I think it really dependent on what type of music you generally listen to, and how big a listening area you have.
Good luck!
Roy
One reason B&W speakers might not work well with SET tubes is not necessary the efficiency, rather that the impedance swings on B&W speakers in general are wide, a 8 ohm nominal speakers can be down to 4.6 ohms. And most SET do not like wide impedance swings.
I was using Cary 300SE signature (15W SET) driving B&W CDM1SE for a long time, extremely happy with the result, now granted, my listening room is small (11X14). I recently changed the speakers to ProAc Reference 8; love the ProAc mid-ranges.
So, all said and done, I think it really dependent on what type of music you generally listen to, and how big a listening area you have.
Good luck!
Roy