Pass Labs Amps - Does the heat bother you?

Can't imagine leaving amplifier on all the time so as to wear it sooner. Why?

I tried a Pass X250.8 and liked the sound. However, that model emits 400W at idle, which, it happens, is the same as the space-heater I use on the coldest days. After setting the amp up and listening for a few hours in the summer, I was hot. Very hot. I had to send it back.

Nelson Pass lives in Sea Ranch, where it is cool and foggy most of the time. Does that influence his attitude towards heat emissions of his amps? I suspect that if he lived in Alabama, he might design amps with different energy characteristics.

The answer to this question is this: 

it depends;

Does the evening sun hit the windows of the listening room?

Size of the room

Model of Pass amp: an x350.8 runs about 55C in an ambient room of 25. So around 30C above ambient. If the room goes up 5 deg C so does the amp. So on and so forth. A Pass X350.8 weighs over 105 pounds, has a large surface area and large heatsinks. The amp will liberate at least 400 watts at idle. So around 1,400 BTU. This is a significant amount of heat in an average size room with doors and such. 
If your listening space is wide open, basement, no sun on walls and windows,

you live in a generally moderate env like northeast the 350 will probably not make any noticeable difference.

If you listen on a higher floor level in house and have a smaller room and sun warms this part of your house the 350 will likely increase the temp. 
so why don’t you tell us your listening space specs and your will get a more accurate response. You can also enter your room dimensions into ChatGPT with whatever amp and its idle dissipation and size and your nominal ambient temp and it will accurately compute the time to thermal equilibrium and temperature. Give it a shot. Tell us the results.

Not in the winter 😳

This is nuts. Class A amps get hot. How hot? I have a Pass INT-60, admittedly an integrated, but I could leave my hand on the thing all day long and not flinch. When you go up in output you’re gonna get more of that. The sonics are beautiful. I’m in Texas. If you’re into this and that’s an issue, get a damned fan, or get a life. The main issue here is size and weight. That should be the main conundrum, not the heat. Adequate ventilation solves that. Worrying about heating your room puts you into another category of idiots.