Brodmann FS speakers with SET tube amp

How did you deduce they’re inefficient? I’m still not clear how to interpret those specs. And how can a speaker “not like” a lot of poweR? If they’re 8ohm and 91db, that’s pretty efficient, unless I’m missing something. 

Bingo! That’s the problem with them in a nutshell. They’re very inefficient AND they don’t like a lot of power. What works best is modest power tube electronics. All around great speaker. Except for the dynamics. But nothing is perfect.

I would not think about LS 3/5a’s with a SET amp the LS’s need lots of power as they are not very efficient.

that seems, to me, a strange way to list spec's for those speakers. really wish manufacturers could stick to a standard spec measurements and not something that makes their speaker look better then it is. 

Unless you like dynamics a lot.

Get a pair of LS3/5A's! Either new or used! The BEST small speaker! Read Art Dudley's review of three versions in the latest Stereophile. They are outstanding with Classical works! I have a pair!

What does the impedance curve of the Brodmann speaker look like? Does it have peaks and valleys? What is the output impedance of your Mastersound tube amp? If it is over 1 ohm then it will interact with any speaker having a non-flat impedance curve. The result will be a non-flat frequency response from the amp/speaker combination. Hardly what can be called "accurate" sound quality! Ohm's Law rules here!