Installing Subwoofer

[CooperJohn]

Calling all audio experts. I have a 2008 Quad cab with the single disk, infinity 7 speaker system. I would like to add an amplifier and subwoofer that I have from a previous vehicle. The amp has pre-amp inputs as well as speaker level inputs. I don't believe the stock head unit has pre-amp outputs or sub outputs and I don't feel like swapping everything. Is it possible to tap into the rear speakers and use the speaker level inputs on the amp without losing the rear speaker sound and if so has anyone done this with good results? The system would be good enough if I could just add a little bass. Thanks!

 

[EMcCalister]

Yes you can do this and it will work fine. I found it easier to tap into the front speaker. The sound is decent.

 

[CooperJohn]

Question

Where did you tap into the front speakers?

 

[Bernie]

Also, JL Audio has what they call a "clean sweep" system that will integrate with your stock head unit and give you better performance / more control. Check out Crutchfield for more info on it.

 

[Big_Horn]

Also, JL Audio has what they call a "clean sweep" system that will integrate with your stock head unit and give you better performance / more control. Check out Crutchfield for more info on it.

I agree, the clean sweep is a must. I ran the stock head unit with aftermarket speakers, they crackled and popped. Drive me nuts!! You are probably not changing the door speakers, but your sub might suffer. A cheaper route would be getting this: Scosche SLC4 Four-channel line output converter at Crutchfield.com



Tapping into either the front or rear speakers, preferably the rear speakers, (you really don't hear them much. ) Access the speaker wire by removing the kick panel on the passenger side. Your speaker wire is twisted together. I don't remember the colors, but if you test the wires with a light tester and there is no power then take a 9 volt battery, touch one wire to the + and one to the - if you hear a popping sound, that your wires for your speakers. If you can see which way the speaker is flexing you can determine your polarity. If the speaker is moving towards you, your polarity is correct. If it moves away from you, your polarity is opposite. It's really hard to see the speakers, try low light and a flashlight shining through the speaker grill. It may be easier just to remove the door panel which is super easy to do. I replaced my rear door speakers in 20 minutes and that was taking my time. Got anymore questions please email me... BH Oh and I forgot to let you know, I put my 12" sub between the front seats. Sounds great, no delay with the sound, and you even get a mounting point for your CB and brake controller. Do a search for hot box on ebay but dont buy it. its a racket. I got one and had to basically rebuild the entire thing. I payed $150 for a couple swatches of sewn fabric. I could have done it myself for a lot cheaper. Want pictures? just let me know.

 

[ENafziger]

If you're going to do it that way, you have to tap the front door speakers. They are the only speakers that the factory amp/crossover sends low frequencies to.

--Eric

 

[CooperJohn]

Thanks to all who replied. I was messing around with the stereo yesterday and ENafziger is correct. The front door speakers are the only ones that get a bass or low frequency signal from the amp. Anyone who has tapped the front speakers for powering an amp, where did you access the wires? Thanks! I will look into this "clean sweep" unit as well.

 

[Bernie]

Also, Check out the cool sub enclosures that use the rear seat storage space that Crutchfield has for our trucks. I was curios to see how people liked them.

 

[JNasty]

I got a 10" sub to fit in the useless front center seat storage. Maybe not useless, but I never remember it's there.