Locate your car's rear speakers -- specifically the factory speaker wires running to these speakers. Carefully splice into the positive and negative wire on both the right and left rear speakers using a wire stripper.

Now attach a line of speaker wire to each splice and secure with electrical tape. Run this wire back to your amp and hook it into the speaker-level inputs. Make sure to put the right rear positive wire into the right rear positive speaker-level input, and do the same for right rear negative wire until all four of the wires are connected. Now that your amp is tapped into your car's factory audio system, run speaker wires from the amp's speaker outputs to the speaker s or sub-woofer s you want the amp to power.

Make sure to connect positive to positive and negative to negative. Connect the red power wire and ground wire you prepped earlier to the proper inputs on your amp. Secure all of the amp's connections tightly using a screwdriver. Reconnect your car battery, and test your new audio system. If the amp doesn't seem to be working properly, disconnect your battery again and go back and double-check all of your wiring for possible damaged wire, grounded wire or loose connections.

Hi Matt, Sorry I could not reply sooner — interesting story there. I guess in this case they used a separate line output converter since you mentioned they used RCA cables. Perhaps a faulty line output converter?

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Let me know what happened. The amp has both high and low inputs, remote subwoofer control as well as variable bass boost. Can that feature be turned off on the stock head unit? Some have that option. How would I be able to install the most optimal setup possible?

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I have them in a Honda accord tapped in through both rear trunk speakers currently and they sound great and all but with all this new technology there has to be a way to improve, could you guide me with any way to improve my system when switching it from the Honda to the cadillac? Or do you prefer I try to purchase maybe a more up to date amp for my optimal set up.

I can include pictures if needed. I did it all with a little hard work and wal mart. Hi Mr Linville, I apologize for the late reply. You could grab your audio signal right at the stock subwoofer in the Cadillac. Hi Anne i have a jeep Cherokee sport and the jeep came with no amp or subs. I replaced the stock speakers and tried to get them amped. As soon as the speakers were amped up the sound shuts off. The place where i got the amp installed said that my oem unit cant be amped.


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Now i have nice speakers that i cant turn up loud. Is there any amp that will work with my stock head unit. Basically, you need more professional, more experienced shop to help you.

How to Add an Amplifier to a Factory Stereo

The best way to do this would be to use a processor that corrects the audio coming out of the head unit before it gets fed into the amp. It already has 2 factory subs under the seats. Do I have to splice the LOC on both subs or just one? Whats the best LOC for such a job?

For this vehicle where would I get the best frequency results from? Have you guys worked on such a vehicle before? My main concern is controlling the volume to a subwoofer. With many aftermarket headunits, they have sub volume control so you can lower the subs volume and turn up the other speakers or vice versa. What if any options are there for this if using a factory head unit? Hi Frank, Towards the end of the article I mentioned the option of a separate bass control knob.


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  5. We normally take it apart and mount the box behind a panel so all you see is the knob itself. I am hooking up after market amp in range rover and have loc converter got to factory sub but has four wires red and black also green and grey on the other side which ones do I hook up to to get bass for after market subs. If we have a factory sub we typically tie the positives together and tap into the single positive lead of the sub and negatives together and tap into the single negative lead of the sub.

    I had my installation done by so-called professionals. They are powered by: Here is the problem when I play music too load the system shuts down. The shop that did the installation put a converter and they say that everything is fine. They say the problem is with the factory radio. Could this really be the case.

    Hi Allan, sorry to hear about your experience, but it sounds like a bunch of unprofessional installers. Did you have the stock JBL amplifier in that car? Or just the basic head unit? Typically the only things that will cause an amp to shut down like that is a bad ground or a signal that is clipping causing the amp to overheat and shut down. By the way, it would sound way better with an aftermarket head unit, just an FYI. When I play the radio the sound is low, lacks bass, cannot enjoy it at all. Radio volume cabln be cranked to the maximum.

    The bass is overpowering. The highs are sharp intolerable. Previously had the same amp and sub with zero distortion. Is it possible that this car cannot be fitted with and amp and sub? The stock set up was better than it is now. Most Honda Accords are equipped with a noise cancellation microphone in the cabin — it needs to be disconnected, that will fix your problem! When the install is complete and I hook back up the battery neg terminal to the car, the system works and sounds good.

    But when I shut my car off and then turn it back on my amp comes up with the red light protection error every time after. I have no idea why. The factory system is the beats audio. Do I need to keep the factory sub installed and wired up too? If it does, that would indicate possibly a poor ground for the amplifier.

    Hi Annie, I have an 06 maxima with the factory premium bose sound system. All i will need is a LOC with bass control, to tap into the rear stock sub and wire the amp kit like normal right? Also, the watt amp has watts rms x 1 channel 4 ohms bridged , and my sub is 4 ohms, watts rms watts max. Is this amp good enough to get nice bass from the sub?

    How to Wire an Amp to a Sub and Head Unit: 12 Steps

    Or do i need to upgrade to a bigger one before i hook it up? I want bass without having to buy a new alternator lol…. Hi Ashton, yeah you got it right. Can you do that or am I way off the mark? Hey Ben, it really kind of depends on your equipment. If not, yeah I would grab a 4 channel line output converter and use two separate RCA cables — one run the front channel and another to the sub channel.

    Additionally I would get a bass knob so you can have an independent sub level volume control as opposed to adjusting the bass on the head unit which will adjust bass levels to all speakers. I just installed a aftermarket radio in my 06 Chevy Equinox, everything turns on and looks like it is working but no sound is coming out.

    HOW TO: Install Subwoofer w/ Factory Radio

    Any ideas as to what could be wrong? You probably have a stock amplifier that needs to be powered up. Like if you have the Bose system? You would need to use the remote turn on lead from your aftermarket radio usually blue with a white stripe and wire that to the amp turn on lead in the car harness. Hello annie,awesome blog here!

    I am very familiar with audio systems and have performed all installs on my personal vehicles.