Some (many) powered subs have high level inputs, so you can just tap into the rear speaker wires. If your car has a factory sub, use its speaker wire instead. If it doesnt have high level inputs, you can use a basic line out converter that ties into the speaker wires and turns them into a rca output.

How do you hook up subs to speakers?

Connect speaker cable from the main speaker outputs on your receiver/amplifier to the input terminals on the subwoofer. Correctly match corresponding speakers (left, right) and polarities (positive, negative). Connect speaker cable from the speaker outputs on your subwoofer to the corresponding left and right speakers.

Can you wire a sub without an amp?

Subwoofers are designed to increase the bass frequencies, resulting in a deep, thumping sound. In most cases, they are paired with an amplifier to boost the sound. If you do not have the funds for both components, you can still hook up a subwoofer without an amplifier; it simply involves a little more know-how.

What phase should a subwoofer be set to?

Typically, though, phase is left at 0° for most applications. While seated in your listening sweet spot, play music with bass content that is familiar to you and then have someone switch the 0/180 phase switch on the sub to 180-degrees. This will let you determine if the bass sounds louder in your seating position.