Hello, i would like to just say right off of the bat.. i know a little but not nearly enough to diagnose this situation, so bear with me while i try to explain it the best that i can.
So here it is:
I have an mrv-f300 alpine amp (literally brand new, exchanged under MFG warrenty today, but problem apparently lies elsewhere.) which powers my four speakers (three speakers, the one is blown and i am sending it in to alpine as it was a defect not caused by me). They push 50 watts per channel running 2 ohm resistance.
Everything has been working fine from 6/18/13 (date of install) until a few days ago. Nothing new was put in, and nothing was changed before it started acting up.
The amp was shutting off (turning into protected mode with a red light), and i figured it was the ground, because it also lose audio quality before it turned itself off (usually 5-8 minutes at volume over half). I redid the ground to the point where it is bare metal to bare metal on a screw in the trunk (i scraped the coating). It can not move and will not unless unscrewed. The wires from the back of the stereo were spliced, as it is a stock head unit in a 2009 Chevy Cobalt LS XFE.
The autotechnician that i had install my system swapped the amp out today to try and see if it was perhaps a bad amp. Since then, the amp has went into protected mode only twice, but it cuts out at varius intervals for a few seconds (longest about 15) every few minutes (can be a couple times a minute to as little as once or twice every ten minutes). The fuses look okay, and i know it isnt my alternator/battery, or remote wire (the subwoofers and speaker amp share the same remote), as the subwoofers stay powered and slamming regardless. I have also not had any issues with power loss to the car.
The fuses seem to be okay, and i redid the remote wire (just the end connections, i havent been behind the radio to check those yet) so that it spliced two wires from the main wire (the one running with the speed cable from the front to the back). The subwoofers stay on, but after i did this i saw that (one time) when the amp cut off, the blue light flashed three times. Everyother time the amp has cut out, it has not lost the blue signal light, or it has gone into protected mode (red light) which in turn made me have to turn the car off and on again.
To recap, my subwoofers are fine, and use the same remote wire as the speaker amp.
My speaker amp is brand new, and is having the same issues as the one which it replaced.
The ground wire is as connected to bare metal as physically possible, and only runs three feet (kicker wiring kit from bestbuy is what all of my wires are)
The power wires have no corrosion, and none of the fuses look blown.
I am at a loss, and so is my coworker who installed it (professional install technician)
He is going to take a look at it tomorrow, and see what he can deduce, but in the meantime i would really love some possible thoughts from all of the experts out here! i figure somebody may have had the same issue at one point.
and keep in mind, i listed above as well as i could what all has been happening, but if you see that i am doing something majorly wrong, please inform me politely because i am a complete novice at this, but would love to become an expert one day!