I own a Rowland Model 2 with a BPS (battery power supply).
Until I heard the Pass Aleph series, it was the best sound I've heard/owned. I do not like the newer Rowland amps. I believe they are weak in the bass. I bought my Model 2 from a friend who "moved up" to a new Rowland Model 112.
Although it was rated at 150 watts compared to the Model 2s 75 watts, everyone who heard it on his Wilson Witt 2s agreed, the Model 2 had better bass control. He sold the Model 112 & bought a used Levinson 333, its now for sale on Audiogon...
I recently bought Pass Aleph 2s on Audiogon. The Pass Aleph is the first amp I've heard that came close & in the midrange beat my Model 2. Right now I wouldn't sell either.
I also own an Aleph 3 & an Aragon 4004 MkII, they both work great for the systems I use them in...
The Rowland amps must be left on all the time. The Pass Alephs run too hot in Class A to leave on, they warm up in 20-30 minutes.
Its like having 2 girfriends!
Rowland & Pass..
Daniel