Quote:
Originally Posted by
dmusoke 
What circuitry (in general terms) does a signal go through when the D2v is in Analog-Direct mode? Any active parts in the path(buffers, filters etc) in addition to the volume control?
The reason i ask, is that i connected by Oppo BDP-105 stereo outs (XLR) directly to my power amplifier(Sunfire 7x400W) and the sound was just simply glorious. It was 'there', a presence i'd never known. But when sent through the D2v (XLR ins and outs), comparativel, it sounds 'muted' and somewhat veiled.
Knowing what's inside in basic block-diagram form isn't going to tell you much but since you asked it's an all-analog active path with the usual devices - opamps and volume controls (carefully selected, laid out, and working in synergy of course). Without buffers - that's opamps running at zero gain - the frequency response would vary according to volume setting and/or cable length and/or amp input impedance, which is why you hardly see passive preamps anywhere, in fact I get the impression that the only places they exist is among people too concerned with block diagrams and not enough about what comes out the output jack, open-mindedly.
As for what you're hearing I can only say that when the signal path is known to be audibly transparent and that first-time participants in properly set up blind tests often leave very surprised, maybe try a few more listening sessions. For an idea of how easily the eye beats the ear, given normal vision and hearing, the two videos below may be of interest. It's also why bad center channel speakers get away with it so easily.
http://www.youtube.com/watch?v=G-lN8vWm3m0
http://www.youtube.com/watch?v=BYTlN6wjcvQ for about three minutes starting at 5:26
(posted at risk of sparking yet another blind vs non debate...
if you must, I'm sure many people would appreciate it in a new thread)
Thanks everyone but sorry, keeping up with posts can turn into a full time job before you know it so I have to go now.