Got my Song3s in August. Paired with Parasound Halo integrated, by many measures comparable to the Krell KVA-150. What I do not like about this combination may occur with the Krell + Song3 combination you are considering. I find the combination of Halo and Song3 a bit too bright and 'transistor-y'. The Song3s are terrific in so many ways: imaging, soundstage, vocals, and other characteristics. I do not think the Song3s themselves are too analytic but the combination with the Halo leaves me wanting to upgrade. The Song3s are really efficient, easily driven. In my listening room (roughly 16x20) the Song3s play at high volume but the Halo is never working that hard. Decent output, mid-current design. I think the Song3s would really sing with a tube amp. Looking at the Prima Luna Dialog all-tube integrated ($3400 on manufacturers website; The Music Room had one used/a few months old last week for $2800). Obviously, there are lots of choices for good amps, maybe too many, but this is the direction I am heading with my Song3s. Source is CDs and SACDs with Emotiva ERC-3 as transport and the onboard DAC in the Halo. Yes, the DAC is a candidate for upgrading, too.