Raul Tllo: Yes, it means the negative post is connected to the car body. Without a car body in the equasion, your only choice for ground is the negative terminal on the power supply. Do not confuse this for speaker and amp input or output terminals. Do not ever connect those to the power supply negative. Your sub will need Low pass and your other speakers will be happy with high pass. If you didn't throw away the instructions dig them out and review them.
Jodie Capella: its a used amp. so does that mean i can use the neg post for a ground on the amp? will it hurt the amp? can i use 2 channels for one sub? what gauge wire should i use?
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