The problem you are dealing with is that the speaker is inefficient. They rate the 'sensitivity' at 89 db, which is at best moderate, but when you do the math (its a 4 ohm load, sensitivity is 2.83 volts into 4 ohms) what you see is the efficiency is only 86 db!
In most rooms that is a need for a lot of power! In my room I would need 400 watts at a *minimum*. My room is 17' x 21'.
If I were you I would look at a more efficient speaker if you want to use tubes. The Sasha that you mentioned is an example- 100 watt tube amps drive it quite well despite its low impedance at 80Hz. Another speaker to consider that is in the same performance arena is the Dreammaker by Audiokinesis.
In most rooms that is a need for a lot of power! In my room I would need 400 watts at a *minimum*. My room is 17' x 21'.
If I were you I would look at a more efficient speaker if you want to use tubes. The Sasha that you mentioned is an example- 100 watt tube amps drive it quite well despite its low impedance at 80Hz. Another speaker to consider that is in the same performance arena is the Dreammaker by Audiokinesis.