Thanks Agiaccio.
Davidmag, I use an Anthem AVM50v. Not sure what the gain is, but I found that higher gain on the Nighthawk resulted in expected, quite audible distortion.
One more question on a slightly controversial topic. What TT/tonearm-to-Nighthawk interconnects are you all using? I currently run BlueJeans LC-1's (which sound as neutral as DHLabs Phantom or AQ Blue Racer II which I've tried) and I'm trying to determine if that's another upgrade I need now...