Strange Problem with amp for subs

[danmn1313]

I have an older Hifonics Brutus amp and some older 12in Fosgate P3s (probably from 06 ish). I had them in my Marauder and they were great, then I sold that to buy a Cummins and another DD which is my SHO. Long story short I installed my headunit, subs, amps, and door speakers in my SHO and everything worked great for about a year and half.

Now I have this strange issue that I have searched all over the internet for and can't seem to come up with an answer. The amp turns on, the subs play but not to the music. They just make a constant thump, thump, thump at any sound level. They will just do this the whole time my headunit is running. I checked fuses all checked out good, solid ground still, I tried different RCAs, the only thing I haven't tried (that I think could be an issue) is try a new power cable.

So before I just throwing money at it I was hoping some of you might have some ideas.

BTW, this seems like a great forum and I have browsed it from time to time when shopping for truck's system.

Danny

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[mylows10 5,000+ posts]

sounds like maybe bad rca's ,but recheck all wires for voltage and grounds .put the dmm leads right on the amps power and ground and remote to check ,make sure you have at least 12 volts on power and remote wires.

 

[oldschool4me 10+ year member]

sounds like the power supply. had a mtx amp that did the same thing..... i ended up trading it to a guy on here. let me see if i have any old messages on it.

 

[oldschool4me 10+ year member]

well i dont have any messages about it but i do believe ampjunkielikeme is the one i traded it to and he fixed it so if he is still around i would send him a message and see if that was the issue.......i know when i hooked the amp up it would just pulsate the sub like a heart beat.

 

[danmn1313]

All voltages checked out and tried some new RCAs, thinking you might be right about the PSU being bad oldschool. I'll probably just buy a new amp and see if that fixes it and if not I'll take it to a shop.