MUSICRAFT:
Hi Tim
I would highly recommend the A-S500 as it is excellent. Over the last few weeks some of my clients have compared the A-S500 to other amplifiers such as the PM6003, RA-04SE and C326BEE with various sources and speakers (including 685's). On every occasion the A-S500 was chosen.
The A-S500 is well built, finished, powerful and featured (iPod/iPhone can be used via YDS-12 or YID-W10). I feel the A-S500 excudes class.
All the best
Rick @ Musicraft
Well we did that exact showdown for a customer last Saturday as we have them all on demo, and he chose the Rotel. Funny, maybe it's a regional thing.
To the OP, please do get a listen for yourself. You need an amplifier that can deal with a speaker that can occasionally drop to 4ohms, can keep the strong B&W bass in check, and keep them from sounding muddled.
If the amp is doing the job properly, the B&W's can sound dull, muddled, with a monotonous bass lacking kick and punch. Listen out for these negative qualities - if you can't hear them, the amp is working well with them.