Okay, I figured somebody here had to be running a separate preamp for music

Can either of you guys give me an idea of what the differences are? Subtle? Distinct?

And do you think I'd be better off with adding a preamp for 2-channel, or getting a better source for and running it stereo bypass through the 950?
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My Outlaw Journey:
1050 Receiver (2002-2004)
M200 Monoblocks x7 (2003-2008)
7075 Amp
950 PrePro (2003-2010)
975 PrePro (2012-Present)
Outlaw ICs (2003-Present)
M8 Subwoofer (2011-Present)
???