I have a Kicker 600.4, its a 75x4 @ 4 ohm amp. The problem is that only 3 channels of this amp work. When i hook up a speaker to the 4th channel,there is a little spark when i connect the speaker, then the speaker makes like a tearing sound for about a second, and then a little bit of smoke comes out of the speaker. The speakers also has a burnt smell by the spider or the voice coil (cant tell which it is). The speaker then doesn't work, plays no music. I know its not the speakers because i went through about 4 speakers. I just bought the **** thing online, so i dont think i have a warranty. Does anybody have any clue as to what the hell is the matter with this amp, and how can i get this thing fixed. Thanks guys