My DA-555es bought used from Roberts A/V in CT has a user-adjustable multichannel digital eq to drive my RB-35's. Now this is waay before Audyssey came along (not user adjustable) and I find the Sony eq useful since the 35's need a bit of a midrange boost for better balance . Now my first Reference bookshelfs, the RB-5s have almost dead-on perfect mids, though the sound isn't as detailed as the 35's. Lord, I wish I could run the 35's full range just for the beautiful bass I get from them but I live in an apartment. Wish the Pakistani family I'm friends with upstairs would make more noise so I'd have the excuse to blast 'em but I want to keep good vibes going here (hehe). Also, just got a pair of open box 81 II's here from Acoustic Sound Design to compare the three sets. It's an ongoing experiment but an easy one since efficiency and enclosure size is about the same. With the 81's I'm discovering even more of that great Klipsch impact and subtlety. My BIC HT-75 horn system is great too, but are definitely a cut below the response of the Klipsch and less clarity and detail in the mids and highs. In fact they really don't even come close to the name brand but they still do sound great. Was considering the RF-62 II's but it would have been overkill here and not fun come moving day. Next move will probably be to check out the top of the line Newcastle with the Trinnov processor but I'm kinda old school and don't really need all its features but it is tempting.