So you disconnected the kicker sub amp and connected an external amp to the kicker box?
Did they disconnect the sub all together?
How was the bass? Good or non existent?
I'm not following the grumbling noise sounds like a ground or reverse polarity on the wiring...
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We took the sub altogether (sub and small amp still connected to each other) and powered it to a completely separate system that was working perfect and was grounded and everything. The completely separate system powered the sub and did the exact same thing, the exact same grumbling. If it was a ground issue with my truck, I can't see that it would do the exact same thing on a completely different system.
When it was connected, the bass was good. Played music great, just with a background of a grumbling sound. The installer really thought it was an issue with the small amp that is attached to the sub itself. Talking to Beau, he said they cannot separate that small amp from the sub, so the entire thing will have to be shipped back to him and a new one sent.
I asked the installer probably 20 times if he thought the ground was good. He assured me every time that the ground was very solid. I personally looked and messed with the ground myself and it is mounted very solidly and the metal was scratched up to expose bare metal.
After today, I am 100% sure that the sub (or the small amp connected to the sub) is defective. Who knows, maybe the wiring from the small amp to the sub is what's f-ed up. Beau did warn me not to mess with taking the small amp off the sub, he said that automatically voids any warranty. It's probably going to cost me a good $50-60 to ship back to Beau, but at least I know he'll take care of it and I'll get a new sub