i was using it in my gf's car on her fi q at .7 ohms and bumped it hard full tilt for long periods of time and never got hot, got a lil warm, never hot
had a single hc 1800 in back and an hc1400 in front and voltage stayed at 13.8ish..
its a great amp
im getting a mojo 4kw or saz3000d soon though //content.invisioncic.com/y282845/emoticons/ohsnap.gif.17c4c91be09a7a4a3995fb7145adac39.gif