Bass leaves after amp warms up?

Fishing's girlfriend hears the same differences. So there should be no doubt that its a real phenomena.

"04-20-13: Csontos
Quiescent current is higher when the amp is cold and decreases as it heats up whether the outputs are mosfets or bi-polar. But more so with mosfets than with bi-polar outputs.
Csontos (Threads | Answers | This Thread)"

Not so with the two powerhouse ME850's I have here, both are at 20mv accross the emiter resistors 12 per channel when cold and by 20mins they have climbed and stablized to 50mV. My bass is ultra tight but 2 dimential when cold then it looses precieved tightness for a more 3 dimentail bass when warm. I believe this is what's happening to the poster. Or his supply is sagging as the bias climbs if it goes up like mine as it's warming up.

Cheers George

http://www.me-au.com/html/me850hc1.html

Cheers George

Hi George. Yes, I will observe it climbing from turn-on to warm-up also. By 'cold' I meant not having yet played music. But as the amp is taxed, current will fall off ime.

3D bass sounds exactly what is leaving
When I haven't listened to music for at least 1 hr.
The bass is 3d sounding wide & deep
After about 30 minutes or so the music changes and bass looses full sound becoming anemic.
Also Dynamics have decreased.
Sound goes from robust to comprimised
What is the solution?