Problem is it has a different connector... oh well but still 580v....
never have heard one yet.
Stax made a portable, battery-powered amp, believe it or not. Still, it took something like 8 C-cells, so it wasn't small.
My take on a portable Stax amp is larger and heavier than a SRM-001 but also more powerful. And while being about the same size as an SRD-X it is significantly less heavy. I just took a 10 AA-battery case/holder (Batteriehalter für 10 x AA / R06 (Doppelt)) filled with 1.2 V accumulators and attached it to an SRM-212. Both devices are placed in a compact cordura bag with a ribbon for hanging it over my shoulder. The 212 is fed thru a Headphile Blackgold cable from an Iriver H180-ibasso D10 combo.
Any of my Lambdas sounds just great with it and battery life has never been an issue so far (I'd say well over 10 hours). Haven't tried it with the 4070 or O2 I/II as the former is too heavy and the latter like more power. TBH I mainly use the set in house. It brightens up my part of the housework, especially doing some of the dish washing .
Totally different to Denons. AFAIK they are tuned to be dead neutral, but the time I tried them (with a 717 and high-end DAC) they were wonderful with vocals. Such a rig made my D5000s at the time seem like a pretentious effort at music reproduction.