Eran,
I had a look at this design; it is very good, at least from the amp designer viewpoint. Of course, I cannot answer for the sonics, but my gut feeling is very positive. Jaesche says the phase angle does not exceed 12.5 degrees at any frequency, and impedance varies from 3.7 to just 6.6 ohms - an excellent load for any SS amplifier.
A 55W N should drive this well, a 100W would take the drivers to their maximum (it's an MTM using the Vifa PL18). On the basis of the figures I saw, I'd say it would be a very good match.
Cheers,
Hugh
