Thread: question about hooking subs up 99 grand prix gt.

Depends on what kind of radio is installed.

No. But they make some amps that have a thing that you splice to the factory speakers wires and it plugs into the amp, this isn't the best way of doing it but if you have a factory deck its the only way to really doing it that I remember.

Originally Posted by slick2500

No. But they make some amps that have a thing that you splice to the factory speakers wires and it plugs into the amp, this isn't the best way of doing it but if you have a factory deck its the only way to really doing it that I remember.

Thats a high level input. You'd want to go with a LOC and some RCA's if you plan on keeping the stock deck for a while. But it's gonna sound like chit if you're looking for any kind of sound quality. The bass is gonna sound loud at low volumes and weak at high volumes. It'd be best to go with an aftermarket deck so you can control the subs separately.

Originally Posted by Kolton Lock

Just go pick up any aftermarket deck with an RCA out .

Btw you will lose steering wheel controls

I agree lose the stock deck buy a aftermarket deck, gm stereo harness($5.99) make sure to connect the pink wire from the small red harness to the remote wire (blue/white), gm antenna adapter($4.99, mounting kit ($10) from ZZPerformance. Replace the speakers to, it will sound so much better. I put a Alpine deck with 3 RCA preouts, 240 watt 3-way 6.5" Kenwood in the front, 270 watt 3-way 6x9 Pioneer in the back connected to a 600 watt 4-ch Kenwood amp, 140 watt 2-way 4" Alpine type S to the stock bose amp and two 12" subs wired in series bridged to a 1000 watt Kenwood amp, Big 3 upgrade, 2000 watt 2 farad capacitor, it sounds great I love it, my brother-in-law can't stop talking about how he wants to do the same to he's GP. If you want to take a look Click my Grand Prix cardomain link below.

I agree with new deck install. If u wanted to keep the deck stock u would have to use line

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I agree with new deck install. If u wanted to keep the deck stock u would have to use line output converter. I've used em before and they definitely don't have the best sound quality. For the remote on switch a 12 volt source and a cheap on off circuit switch from parts store under ur dash or something. Its simple. I have something similar for my auxiliary in adapter

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You can also buy a steering wheel control adapter where you can use your steering wheel to still be functional with the after market deck.

https://www.amazon.com/PAC-SWI-PS-In.../dp/B001EAWNVY

I used the PAC-SWI and retained the use of my stereo controls. You need to make sure that the new headunit has a wired remote plug in the back. 99% of new headunits will have this feature by default. The only other step was splicing into one wire on the factory harness with The PAC interface. The unit self programmed for me and installed in less than 15 minutes.