We audiophiles are ever hopeful that, however satisfying our present equipment and setup, we can achieve even greater enjoyment with a tweak or an upgrade. And we never stop: It was only 16 years (and three turntables) ago that I bought what I declared would be my last turntable, and there's no doubt that this "dead" format has improved substantially since then. Now, even as we make another (but less paradigm-shifting) format transition, from CD to SACD and DVD-Audio, new two-channel DACs continue to appear that show us how far we still are from wresting all the music from the original "Red Book" 16-bit CD format. I reviewed the wonderful <A HREF="http://www.stereophile.com/digitalsourcereviews/781">Weiss Medea DAC</A> in February 2003, and there are still on my auditioning rack are two more Swiss DACs that might redefine the category: the Orpheus 1 and the Nagra DAP.
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