Thanks ratpack
There is a small hiss when the amp is turned off,like the caps are discharging.It's only for a couple of seconds.My Velodyne ULD 15 amp does the same thing.The 7500 made my Klipsch speakers sound alot fuller in the mid's and the bass notes are very tight.I ran the amp for a few hours on U-571 and some music at high levels and it ran very cool.(the 7125 ran hotter at the same levels)