The Lightspeed did not work for me...I was picking up a lot of intermittent noise, seemed to be RF noise, related to using single-ended components and interconnects in a Manhattan high rise apartment. I also found that the Perfect Wave DAC sounded a little too strident through the Lightspeed. This has to reflect the shortcomings of the PW DAC, which seems to need a tube preamp to sound its best.
In some ways, I am trying to recreate the really wide soundstage and low-end weight that I had with my original low end set-up, which consisted of a Northstar DAC, a Manley Shrimp preamp, and a B&K 4420 power amp. Although it could be fatiguing, I loved the REALLY wide soundstage and low end weight. Great for listening to rock. Sort of trippy sounding in a good way. The current setup sounds achingly beautiful at times with well-recorded music, but at other times is a little too dull. Maybe I am being nostalgic about a wide soundstage, but am forgetting that shortcomings of such a sound signature, which is listener fatigue after long listening sessions.
