I leave the doors open on my stand, it seems to reduce the temp significantly. 120 degrees sounds extreme though. I have 2 HK amps in there, the receiver and a 5 channel power amp, they both get pretty hot but I have never had any problem with them shutting down or sounding bad. Here is a link that is interesting http://www.htguide.com/forum/showthread.php4?t=14210 I think I will look into installing a small fan in the back of my cabinet soon.

M80ti's, VP150, QS8's