How can I install a subwoofer if the car stereo does not have an output ?

hey lookey here best buy is right but i got a better idea how bout u get a hi-low inverter where u can connet to the rear speakers from the back of the radio which i can give u where wire code so after u connet the hi-low inverter u have a pair of rca jack right behind your radio !! i have 3 different of hi-low adapters so feel free to email me [email protected]

you need a spliter or an aftermarket stereo

how attached are you to your factory stereo? in the interest of a better sounding system, i'd recomend saving yourself some time and while you've got the deck out, replace it with an aftermarket item. the factory radios generally run less than 10w per speaker, which is lacking. add the cleanliness of rca outputs for the sub and it all justifies the hundred or so bucks. if you want to keep the factory stereo, you will need a signal wire and audio output along with power and ground. do you trust yourself to start probing and soldering wires in your nice new car? if so, splicing wires for the output signal means cutting the insulation off the existing speaker wires and soldering your new signal wires (18 ga should be ok) to them. if you also lack a signal wire, you can find an ignition hot(key on) wire coming off the fuse panel. ideally you'd be finding a spare fuse slot and installing a spade with an inline fuse. less than an amp. the power wire (4 ga) is fused to the battery. 40 amps is common. have fun.

There are a couple of different ways this can be done, and they are generally based on how you wire the amp and the setup you're going for with the speakers. Most commonly amps are 2 or 4 channel, If it's 2 channel, you would run the speaker wire from the first channel to your speakers and the second channel to your sub one of two ways. If the amp has a built in crossover you would set it to eliminate the highs over the frequency range you want the sub to hit, or you would install an inline crossover between the amp and the sub, it doesn't have to be a costly electronic one, an inexpensive one does the trick, but how little you want to spend should be based on how much the other stuff is worth and the quality of the component. The crossover info will stay the same with a 4 channel amp too, if it's a 4 channel amp, you would use the first two channels for your in car speakers, maybe 1 channel for front and one channel for rear speakers or left/right, however, and the second set of channels bridged to the sub (if the amp can handle that). Bridge it by running the pos from one channel to the sub and the neg back to the other channel. Set the crossover accordingly and you're set. I hope this helps you. -C