Again I honestly wouldn't blame the DAC, I had one for quite some time and coming from tubes, never had a problem with its sound signature. That being said, I really do have a feeling that your speakers may be at least part of the culprit, especially if you're not getting this overly sibilent characteristic through your phones. XTZ are not going to be something you'll like. Ribbon tweeters, while they can be somewhat smooth, will have the same sound signature as the B&W's you already have. The XTZ will err heavily on the side of transient, ambient, twinkling. They will certainly not retain the lush, emotional, heavy sound that your 650's have. If you live in the UK you're already ahead of the game lol as you'e quite a few manufactures that are very good. Try Quad, ProAc, Spendor for starters. A really amazing equipment and speaker company is also Sythesis out of Italy. Those speakers will have the same sound signature of your 650's, the XTZ, B&W will be more along the lines of B&W's. Edit - please don't get a musical fidelity lol. They are good but a but overpriced for what they are. I used to work in a hifi shop years ago and Musical Fidelity was the number one traded in gear for the manufacturers I just mentioned. You can go a lot farther with your money.
Edited by colinharding - 5/5/12 at 9:27am