This is the second NVX 8402 that I bought. I love the fact that it has an integrated fan to keep it cool. There is virtually no sound, like some amps, on start up. When the volume is low and you set the gain properly, once again, no background noise or his. Super clean power!! I have this powering an Infinity KAPPA 90-CSX 6x9 component set with the added KAPPA 20MX mid in a '05 Ram quad cab. When I play HIRES USB files, I swear, I feel like I'm in the studio or concert where the recording was made. This replaced a Rockford Prime 500 watt amp which sounded good but didn't really feed my Infinity speakers like they needed. So far so good after 1 year on the first amp. I going to put the second in a Toyota Matrix with a similar setup.