Ideas on the Usher AC-20?

Correction:
The "For Sale" ads not "Wanted" ads.

Sorry.

Ok, well thanks for those words..I intend to listen to them, but he who sells them live far from me, so if someone know something about their soundcharacter I would appreciate it. Thx

Even if the AC-20's were not so far from you, they are older speakers and they will not be available for audition with your amplifier through dealers. When you buy used here at Audiogon, you normally won't get to audition the gear in your room with your equipment. In the case of the AC-20's the best you could hope for is the ability to listen to the speakers in the seller's home or the home of someone you know that owns them. You take a risk buying used, so buy well known items with a good following, at a good price, so you can resell them here at little loss if you don't ultimately like them. That's my advice. Audofeil is bit off base here with his take that you should audition these speakers with your amplifier. In the ideal world that is absolutely true. In this case, that's unrealistic unless there are a special set of circumstances. The exception would be if the speakers in question were a new or recent model still available for audition through dealers. Then you could have the speakers in your room or take your amp to the dealer if they were local. In the case of older models, an audition is generally not going to happen unless you have a friend with those speakers and they're willing to let you set them up in your listening room on your gear to help you make a decision. A scenario like that is unlikely. And sellers here are not going to give you a speaker audition on your amp.

have you read this review of the ac-10? it might give some idea on the ac-20.
http://www.usheraudio.com/news/Stereo%20Times__%20ac-10.htm

I have the AC-10's, but haven't heard the AC-20's. These are very good speakers indeed. The AC series requires very careful set up, and many hours of break-in time. I would describe the speaker as neutral to lean sounding. Bad recordings are almost unlistenable, and they don't mate very well with solid state gear. I found tubes were the best match. You were given good advice earlier, without the benefit of listening personally, stay with the well known stuff.