new hu, sub way low and plays weird

[Cruzer 10+ year member]

so i had a dc 15" all hooked up no problems, stock head unit.

hooked up a distro block, still stock head unit, no probs.

swap head unit, ran rcas from sub output to sub amp. ran rcas from front preouts to speaker amp.

speakers work fine, sub plays but is very very low/quiet. so i figure i need to invert my rcas, maybe i have them wrong. so i swapped the left/right. same thing.

so i swap the rcas from each amp. same thing.

so i switch them again in case i have the polarity wrong. same thing.

all the hu filters are off, sub volume is maxed out. same thing.

the speakers remained playing the same with each rca

lastly, the sub plays really weird. after a hard hit, it like vibrates a ton, at max excursion for no reason, no music is played. it does make a vibrating sound, but it isnt playing music.

ideas? thoughts? what do i try?

forgot, the head unit worked fine in previous car, with different amp/subs.

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[nateberrier 10+ year member]

soudns like an issue with your amp. does it mess up your highs too?

 

[Cruzer 10+ year member]

i have 2 amps. AQ1200D is doing the sub. an older kenwood is doing speakers.

not sure how the amp is doing something wrong now just because of a head unit install. i didnt touch any of the wiring, or settings, or even move it.

 

[Cruzer 10+ year member]

bump, i gotta work tonight so looking for ideas to try when i get off in the morning.

when i swapped rcas polarity, and the rcas from the speaker amp that worked fine, and the rcas from the sub amp went to the speaker amp and the speakers continued to play fine.

so its my sub or amp?

i have different subs i can try on the amp, but no other amp to try.

 

[Cruzer 10+ year member]

off to work

anyone? anything?

 

[Phoenix Risen 10+ year member]

check your amp on a different sub then go from there