The 2.0 should be an easy load for the Levinson 23.5 you mentioned. Bass should be well controlled with this amp.
I also agree with Thom on the choice of amps...Tubes are the way to go with the 2.0. They image like nothing else. and throw a wonderful soundstage. To take advantage of this, you need to have some good tubes in the chain.
The 2.0's had wonderful bass and midrange, but the tweeter was a bit rolled off for my taste. You can upgrade the tweeters and crossovers, but it is VERY expensive. I would opt for a tube amp with lots of extension or energy in the highs, like a good OTL amp. Hope this helps!