So the tip that nobody gave me was don’t be a dumbass and leave your amp on the 4 ohm taps. I can now confirm that the 8 ohm taps definitely sound better. I’ll probably listen for a bit before trying the 16 ohm taps. Nominal spec is 12 ohm but characteristic is 14 ohm according to the chart Zu has with some of their snubbing resistors. Still a tube noob so I’m not used to so many choices.
The carpet spikes are LONG. Fully inserted the spike protrudes about 1-1/2”. So I’ve got plenty of clearance under. Initial bass response is fine. I know intellectually that I’m missing that little last bit of extension that I had before and it would probably show up on a test sweep but why would I listen to test tones already. I have some spare shelves for those IKEA CD racks that were recently discontinued. I bet sliding one under each finger port would provide the opposite extreme for comparison. But not yet. Leonard Cohen is currently telling me I’m in the right ball park as is. I heard a more hiss as a Ben Folds Five track trailed off than I’m used to, but the decibel meter tells me I’ve turned the volume up about 10dB more than usual without noticing. Coincidentally the DW are about 10dB more efficient than my Dynaudio Audience 82 are. These are easy to play loud. Good thing I’m in a house and not an apartment. I’m missing the deepest bass a little with Meshell Ndegeocello but not enough to stop the volume from creeping up again. Got swept up in a Saint Saëns cello concerto. I had a feeling cello would shine on the Zu. I don’t need a speaker to shake the earth or rattle the windows but you can’t roll off too early and miss the upright bass in a small jazz ensemble either. This wasn’t initially intended to be a play by play of my first listening session. There’s some Stanley Clarke, Propellerheads, Johnny Cash, Iggy Pop, Gillian Welch, Dizzy Gillespie, Police, Portishead and it’s going to be a long night. I should pour a drink and put down my phone. I think I’m getting an idea what people mean by Zu sound. "I think this is the beginning of a beautiful friendship."
If it matters:
Primaluna DP HP
Schiit Saga+ (meant to be temporary, but I like)
Oppo BDP-105
Bluesound Node 2i
Cables are some Cullen and some Zu.