OK, I got to listen for about an hour before my DAP's battery died. It's resting and recharging now...
First impressions: no harm was done. The bass I liked from the delta-sigma board is still just as deep, just as resonant. The mids are still liquid. The highs are still extended, sparkly and detailed. Now I need to dig in, relax and start listening for the stuff you don't hear in your first go.
OK, so you guys get an inside look at how the sausage is made while I collect my thoughts.
After that first night, when I was relieved to have my Gungnir back finally, I was only able to listen a couple more times. I was actually disappointed. While the improvements Gungnir brings to my system as compared to Bifrost were still there, that's all I heard, pretty much the same sound. My system has been:
DAP (USB out) -> Gungnir -> Sys -> Aegir -> Stax SR-Lambda
Tonight, right now in fact, I have my other head phones in our living room.
DAP (USB out) -> Gungnir -> Sys -> Aegir -> HiFiMAN HE-500
I have been blown away by the bottom end- the whole bottom end. Low bass, mid-bass, bass/midrange transition, all of it. Extension, power, detail, it's all there and it's addicting already. I haven't listened to any vocal music yet, so I won't comment about that. One O'Clock Lab Band is playing now, so lots of horns. The trombone is sweet and mellow, the trumpets are brash and bright as the blare away at intervals. No sibilance from the cymbals, I'll have to listen to a song which features cymbals, bells, triangles to hear how the leading edges are handled.
I am more excited about the multi-bit board now.