Speaker for Threshold amp and preamp

Look into a pair of Thiel CS2.4's

I would look at electrostats from innersound or martin logan.Eminent Technology is also a good choice.

I would look at magnapan 1.6 or 3.6 speakers or soundlab electrostats if you want to go the dipolar planar route. Otherwise you might want to take a look at Hyperion speakers (great reviews). I don't know what the future of innersound will be without its founder, who I believe left the company, so while their speakers (& electronics) were superb future service etc may be a problem. I always thought that the innersound electrostats and the soundlab electrostats out performed martin logan's offerings but that is just my particular preference as ML still makes very fine speakers and is a company that should be around for some time.

Well, you've heard some good speakers that you can't be sure that you would like. Whether you like speakers a depends largly on how they integrate with your room and the electronics you use to drive them. So my question, rhetorical if you like, is underwhat circumstances did you hear and not like those speakers you referred to? Personally I'm fond of the Tyler Acoustics Linbrook Systems one piece full range system (lots of post here on Tyler speakers), Spendor 100's, and Paragon Jubilee/Jems (which are very hard to find). I think the Tylers have the best quality/price ratio and for a large speaker are easy to set up in a medium sized room.

Your Threshold amp should be able to drive almost any speaker, they are excellent amps. I find Threshold amps to sound a little on the lean side and seem to sound better with a fuller, slightly warmer sounding speaker. I have a Threshold S350e amp and Fet10e pre myself and was driving a set of Infinity Renaissance 90s for the last 10 years. Although the Threshold amps have high current capability, Infinitys are not the easiest speakers to drive and I always felt that they sounded a little lean and didn't quite have the punch and dynamics I was craving. Last fall I found a deal on a demo pair of JM Lab 946 Electras and man what a difference. They are much more efficient than the Infinitys were, the music now sounds much more alive and dynamic. I have heard people say the JM Lab speakers sound too warm or full but not with my Threshold, perfect match. If you have never heard the JM Lab Electra series before I would give them an audition, almost Utopia quality sound at a fraction of the price. Of coarse this will also depend on your room as well. There is something to be said for efficient speakers though, even with a high current solid state amp. I find the presentation to be relativley neutral with these amps very similar to the Pass Labs X series. I would just audition speakers driven only by a good quality s/state amp and go from there. Hope this helps.