I didn't have more time to leave a more thorough post, but I pretty much agree with everything Ctsooner says. There's really nothing that sounds like Ayre. Its the cleanest, purist most liquid SS I've ever heard. Also, the K1 hasn't been out of production too long, and if its not already so, it can be upgraded to its most recent version. The Krell was a pretty good preamp 15-20 years ago. The Ayre, in my opinion, was close to state of the art. There's just no comparison between the 2. You'll never need to buy another preamp.