dCS Rossini Owners - sonic differences with and without the clock

I just auditioned a Rossini with and without the clock this past weekend and quite frankly I don't believe dCS should allow the Rossini to be sold without the clock. 
The clock literally makes a night and day difference. You could pull random people off the street and turn the clock off and on and they would be able to hear the difference in sound stage depth and presentation. It's not at all subtle.

I've heard a lot of DACs before, and without the clock the Rossini is just kind of "good." There are many others at lower price points that sound just as good.

With the Rossini clock engaged, the sound becomes transcendent, one of the best I've ever heard.
Shutting the clock back off would just make the soundstage depth collapse, the difference between hearing the studio a singer was in and thinking they were singing in a small sound booth.

What's an "Objective" revew???

I bought a Rossini and clock together.  I first only hooked up the DAC and was floored by the sound so much that I just didn't even bother with the clock and figured I'd get accustomed and then the clock would be a nice upgrade later.  I went from USB input to ethernet on the DAC which was a small improvement but easier and more convenient via ethernet.  When I added the clock I wouldn't call it night and day for me but yes it clearly gives you more of a good thing.  I don't think you want to try the clock unless you are willing to shell out the money for it, once you try you won't want to go back.  But the Rossini is really good alone and if you are enjoying immensely then just keep doing that until you are itching for more and better then get the clock.  

Why dont they just put the better clock in the rossini and charge a little more....not sure why you need good and better clock same company for same dac....let me guess the top of the line dac has option for better yet external clock?

Separate boxes in order to maintain proper temperature control for the clock is part of the reason. I own a Rossini and clock and agree the clock raises the performance of the DAC. I have found the digital BNC cable between the two to be an important link for best SQ.