You need the right head unit first of all with sub outs in the rearyou have to without a doubt need an amplifier to run any sub wooferits how it gets its power i think you should take a look at u tube/car audio then (installing a subwoofer) a video is worth a thousand wordsaaron is lost. Installing a subwoofer in your vehicle provides power and balance to any car stereo system the speakers in the door panels and rear deck can only provide so much in the way of bass, and a subwoofer is designed specifically for bringing out the lowest tones of music.
The sub out is to connect to a sub amp then to the subwoofer you can run a single voice coil 4ohm sub off the rear speakers fine, people say it will mess the hu up, but thats a lie as ive done it before for a year only use one channel ie left or right, or both on 2 subs will work for dual voice coil 2 ohm sub aswell.
If you're running two subs from one amp, hook each up separately either way, you need some speaker cable to do it if yours is buried under the carpet or run nicely under your back seat because your amp is far from your sub, don't rip it out.
I spent 100 dollers for all of it so you all can say sony is garbage but it is the best 100 doller subs i have ever bought i will show you how i hooked up my 4 sony subs with a home reciver. Yes you can use a sub-woofer without an amp, but i’m not sure what you are planning on using it for maybe a you can use it as a boat anchor or a door stop when you get to your destination any speaker from tweeters to subs need amplifiers to provide the power to get them moving so if you want.
I have just recently installed a subwoofer into a mazda miata check out the video on my page will also have more miata and skate videos up soon please subscribe category. You can't do it without amplifier subwoofers require high power for functioning you can't just plug them into your car stereo\player for playing subwoofer you would require minimum a 2-channel amp 4-channel would sound best.
The fact of the matter is that subwoofers are typically intended to be paired with amplifiers in order to produce that deep, thumping bass that you yearn for, and if you don’t have the bucks to spring for an amp yet, then you’ll have to find some other ways to boost your car’s subwoofer. If the subwoofer features spring clips in order to use speaker wire, then you can use the speaker output of the receiver to hook it all up this process is the same as connecting a basic stereo speakerbe sure to mind the channels.