That is my main concern and keeping me from buying the HA-6A now, I plan to get it in winter.Really just the heat and the size. As much as I loved the sound of it, I realized after a couple of weeks in use (in the winter!) that it just wouldn’t work in my setup come spring/summer. Got the HP8, then, and am pretty happy with that one (and will be even more once I got fully rid of the hum).
I’m gonna compare the 2A vs 3A vs 6A when the zmf atrium closed arrives hopefully this month. 2A smaller form factor and hope it’ll be good alternate with the V222