thx for your reply..
Yes, I've listened to both for extended periods of time. The Studios are undoubtedly very good speakers and - invoking the law of diminishing returns which applies perfectly to audio gear - they are certainly a better deal than the Signatures. That said, the Signatures do sound better to my ears. They extend deeper, are smoother, and can play quite a bit louder without sounding congested - which is important given the size of room I'll be using them in. ..So it's not an easy decision: do I go with an all-Studio 5.1 system, or buy the S8's to feed my 2-channel music fixation?