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How to Connect Power to a Car Subwoofer?

2 Answers

VanSophia

07/28/25 4:04pm

There are several scenarios for connecting power to a car subwoofer: 1. Car subwoofers are categorized as active and passive. 2. Active subwoofers come with a built-in amplifier, where the amplifier's channel output is already connected to the subwoofer. 3. Passive subwoofers require an external amplifier. The power-on wiring is the same as for active subwoofers, but the amplifier's channel output needs to be manually connected to the subwoofer using speaker wires. 4. The amplifier's power-on wiring consists of three wires: positive (+12V), control wire (REM), and negative (GND), which should be connected to the battery's positive terminal, ACC, and the car's grounding point, respectively. 5. The audio output from the head unit is sent to the amplifier, which then powers on and operates.

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OAdaline

08/11/25 11:08pm

I often help people install this at the repair shop. Connecting a car subwoofer to the power supply mainly involves three steps: First, run a power cable from the positive terminal of the battery to the trunk, making sure to install a fuse along the way. This fuse box should be placed close to the battery, and a 40-60 amp fuse is the safest choice. When passing through the firewall, use a corrugated tube to prevent the wire from getting worn out. In the trunk, connect the red power wire to the positive terminal of the subwoofer, and the black ground wire must be securely screwed onto the metal frame of the car—never attach it to plastic parts. Finally, remember to connect the remote control wire from the head unit to the subwoofer so it turns on automatically when the car starts. After finishing, always use a multimeter to check the circuit voltage to avoid any short-circuit risks. When routing the wires, try to avoid high-temperature areas like the exhaust pipe.

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