amp issues

[tsgau]

Last week i thot i blew a sub. It just quit working in the middle of a song and the amp still turned on and the protective mode light wasnt on. Turns out the protective mode light just flashes once when turned on. By that time i had already ordered a new sub. The old sub was rocksford punch series 12 maybe 1200 w the amp was a rockwood 1000 w. The new sub is a sound qubed hds312 1200 w and the amp i threw in ther was a old crossfire 400 w. Both amps quit working the same way, i know the crossfire was no match for the new sub but i had it turned way down. Anyone have any thots of why this keeps happening? No fuses are getting blown or anything. My guess is a bad ground. Please help me out here and thank you.

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[nvturbo 10+ year member]

Use a multimeter to determine if you have 12vdc between the power and ground wires.