How To Connect a Subwoofer To Car Stereo Without External Amp

Can I Connect a Subwoofer Without an Amp will the sub work?

You can install and hook up a subwoofer without connecting an external amplifier to power it up. This can be done by disconnecting the rear speakers and using the channel outputs to be bridged for one large power output to one none powered subwoofer. How to wire a subwoofer without an amp is straight forward because you are tapping into the back speakers in your car, so you don't have rip the dash apart and run any power wires or RCA cables. In terms of performance, you certainly wont get the same amount of bass you would get from connecting an external amp to your subwoofer. This is because the mosfet transistors inside the CD player are only capabale of providing around 30 RMS each or even less like 22 watts. Most say 50X4 on the front faceplate, that is a gimmicky figure and is only placed to give it that edge when it comes to a selling point, that rating is meaningless in the car audio world. If you want to get more power, you can bridge the rear channels together if you are running one subwoofer and get around 50- 60 true RMS watts. This is because you are adding up both channels together multiplying the power fiqures. You also may notice that you will hear vocals coming out from your sub, since there is no low pass filter like on a amp, you can't really mute it out and only send bass to it. The best way would be to turn down the treble and increase the bass settings on your equalizer on your car stereo that is installed to balance it out and make it sound even.

Please understand that you can't use your rear speakers at the same time when using your subwoofer that is not connected to a car amp. This is because it will steal power from them and it won't deliver enough RMS power to push the sub hard enough, since the cone is heavy.

1) Disconnect the speaker wires from both of the rear speakers in your car from the parcel shelf.

2) Now ideally we would only recommend that you run one subwoofer without using a car amplifier. This is because two will be almost impossible to run and they won't really work as such, the cone will barely move. So you are now going to create a a single combined channel output to work with your sub in your car without using an amp.

3) Place the subwoofer enclosure box into your car's trunk. Ensure that the cone side is not facing the seats and is pointing towards the trunk lid direction. This will provide the sound to be more louder inside the car because it help will get more cabin gain. 

4) Connect speaker wire to the subwoofer enclosure terminals. Now you have two pairs of wire from both rear speakers four in total, connect the positive speaker wire coming from the subwoofer box to the left rear speaker (+) wire and the negative speaker wire coming from the sub box to the right rear speaker (-) wire. This is the best way to get more power from your car stereo.
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