Just received the Dynamo and the OTL modded SM. I run it in between a simple Sonos (via SP/dif) and a Bluesound Node (via Toslink) to feed a pair of Goldmund Telos 400 amps with build-in DA converters which in turn power a pair of Leedh E2 speakers and a B&W PVD1 wub. This is simply incredible! Even after just a few hours run-in. With the standard pre-March 2013 SM it was already a great improvement, but this upgrade is HUGE. Especially, the silky details and the lower bass tightness and extension seem again improved (I had to lower the volume of the sub by -2dB - you are not doing any EQ in the SM, right, haha?). Even Spotify can be considered a serious source of music. WoW!