Either way, Ragnarok does have synergy with the PM-1/2 and mods. The Ragnarok's reputation for thin sound may not be warranted. I know that the amp changes slightly over time (toward full bodied - that is a lower-mid emphasis - and with less hard transients). I believe there might have been a second iteration (rolling change) of the Ragnarok too which sounded like this from the get-go. The HDVD800 so strongly imparts its own signature that external DACs don't make much of a difference. But that could also be viewed as a good thing.