Just went to the car to take a closer look, my mistake, the sub high level input is tied to the factory amp output. Please see the attached pic. So its really 'high level' since its amped.
Since my door speakers works fine there is really no reason for the sub not working properly. Could it be the Sony HU's power output is lower than the stock HU? Mine is the Fujitsu TEN.
Could it be a bad car battery? I tested the sound system with the car engine running though.
I am offically running out of ideas...
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