beedish-
Thaks for the great feedback! Glad you kine the KMT60!
Know that your gains are not volume controls... You claim to have then at 80% - 85% and that is usually too high for most head units. The amp is in all likelihood clipping way before your head unit runs out of steam.
You want your gains as LOW as possible, so that your amp reaches rated power, (usually just below clipping) at the same time your head unit just starts to show signs of clipping. Usually a head unit will go to about 75% of its max volume range cleanly, so if your radio goes to 50, you really want to think of max volume at roughly 35 for most source material played trhrough your head unit. With your gain controls set to 85%, I am betting your radio only goes to about 8 or 10 before you amplifier is runing at full tilt max power. When you turn it up from there, all you will get is more clipping distortion.
For most radio and amplfier setups, you will usually find that your amp gains are going to be set to half, and often less. You might want to dig around and find a gain setting tutorial that has been written in another forum here. It will help you get things set up correctly where you have the greatest control over volume level and the minimum in terms of injected noise, (hiss, clicks, pops, alternator whine, etc). I will go try to find one and post a link here.
Know too that the KMT60 has a dynamic impedance of more like 3-ohms. Many 4-channel amps do not like to be bridged into these speakers as it really shows about 1.5 ohms to each amp channel. We will find out when it gets hotter hotter, but know I always recommend a stereo amp for the KMT6/KMT60's instead of a bridged 4-channel amp. If your tower system starts cutting out when it gets hot, know it is due to the bridged configuration.
I'll go try to find a good link to a gains-setting tutorial.
Hope this helps ya enjoy your system more!
Phil
Kicker