If your amp keeps blowing then you need to check your speaker set up, as its very possible that you have a blown speaker somewhere, or a couple of wires shorting together and that is causing the amp to overload... also check the ohm's of your speaker set up, remembering that:
Two 4 ohm speakers wired in parallel = 2 ohm whilst Two 4 ohm speakers wired in series = 8 ohms
Car amps are rated at 4 ohms and failure to match speakers to this can cause amps to run very hot or blow.
Answers & Comments
If your amp keeps blowing then you need to check your speaker set up, as its very possible that you have a blown speaker somewhere, or a couple of wires shorting together and that is causing the amp to overload... also check the ohm's of your speaker set up, remembering that:
Two 4 ohm speakers wired in parallel = 2 ohm whilst
Two 4 ohm speakers wired in series = 8 ohms
Car amps are rated at 4 ohms and failure to match speakers to this can cause amps to run very hot or blow.