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Thread: Jeep Grand Cherokee 03 - Using stock infinity amp to carpc

  1. #1
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    Question Jeep Grand Cherokee 03 - Using stock infinity amp to carpc

    I've been reading around on here through many threads and I've done a load of searching through google (dont all the posts seem to start that way!), but I'm having trouble working out my audio setup, and wondered if someone could provide some insight as to a preamp I should be looking at.

    What I currently have is the Jeep premium factory audio system which comprises of four door speakers and two tweeters in the dash. These are powered by an infinity amp, which is connected to the factory HU - http://www.wjjeeps.com/infinitysys_2.jpg. I am not keeping the HU, so the PC is replacing this, but I am happy with the audio quality from the rest of the system (my ears arent tuned for super high quality audio!) and ideally I dont want to invest in a new amp if I can help it. The HU currently supplies four +/- lines to the amp (is this considered four channels?), and the amp in turn outputs to the 6 speakers. A diagram of this is at http://www.wjjeeps.com/radio_systemdiag1.jpg.

    I'm happy to splice into the cables running to the amp, but from reading other postings with similar cars/audio setups, the problem is that the stock amp needs a high level input, so the output from the pc directly is line level and thus too low, resulting in low audio out of the speakers. The amp has no controls or connectors other than the factory wiring loom, so I have no way to change the amp settings.

    My motherboard has onboard 6 independent 3.5mm outputs, as well as a SPDIF (optical and rca), so I would like to take the audio from one of these sources, into my stock amp.

    I believe I need a preamp or line driver (i'm not an expert on audio so using words I've picked up from the forums, please correct me if i'm wrong!) of some sort to ramp up the level from the PC to something higher, but this is where I am a bit unsure of what to look for, so from looking could anyone comment on these:

    http://www.sonicelectronix.com/item_...ik-PLD40E.html
    http://www.minidsp.com/products/miniamp
    http://www.esi-audio.com/products/gigaporthd/

    In terms of layout I'm guessing it would be:

    PC > Preamp > Stock Amp > Speakers

    If none of the things I have mentioned above are suitable, could anyone make some recommendations on what I should look at? Sorry for such a long posting.

    Thank you very much in advance

  2. #2
    Constant Bitrate kolton5543's Avatar
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    If the amp really takes in high level inputs then I would say to just use this amp. It should work fine. It's four channels so it's perfect for your stock amp. Because of the way it connects to everything makes it simple. There's no special connectors or anything needed so you can just cut the wires on your stock wiring harness and plug them in. The only real issue I see with this is that you'll be buying and 200 watt amp just to supply signal to a factory 180 watt amp. If you do decide to go this route be sure to find a heatsink for the chip.

    I'm sure you could probably use the amp you posted but powering it may be an issue. I don't know what kind of voltages it operates on but I'm sure that it probably runs on the 12 volt system and can be operated of of the computers power supply.
    Last edited by kolton5543; 08-20-2011 at 08:35 PM.
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    MySQL Error soundman98's Avatar
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    ^ exactly. you need a amp to connect to the factory amp..

    i would really recommend replacing it, at this point, you are only adding more complexity to the system.

    and fyi: i have the gigaporthd-- you need a preamp like the alphasonic unit just to make it usable with aftermarket amps.

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    Thank you for the replies, and advice. I agree that I should probably look at replacing the amp, but as this is my first car pc I'm going to stick with the stock amp for the moment and see if i can get it to work.

    What i've finally decided on buying is this http://www.pac-audio.com/productDeta...&CategoryID=28. The other products werent available and no UK stores seemed to stock anything similar. I'm hoping the PAC device does what I need it to. I'll re-post my findings and if I've managed to blow anything up when it goes into the Jeep - hopefully it might help others if they are looking to do a similar thing using the factory equipment in the future.

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    MySQL Error soundman98's Avatar
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    i hope i'm not too late..

    that pac device converts high level signals-- like from speakers-- to rca connections--that connect to normal aftermarket amps, and unfortunately, will not work in the way you need it to (i also agree that the product listing is very vague about what it does)... a couple years ago, when i started here, i did some very serious inquiries into locating a unit that would do what you are looking for, and the only cheap option is to use some of those "motorcycle amps" on ebay, or something like the super-small amps in the mp3car store(also available on ebay-- possibly closer to you)

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    Quote Originally Posted by soundman98 View Post
    i hope i'm not too late..

    that pac device converts high level signals-- like from speakers-- to rca connections--that connect to normal aftermarket amps, and unfortunately, will not work in the way you need it to (i also agree that the product listing is very vague about what it does)... a couple years ago, when i started here, i did some very serious inquiries into locating a unit that would do what you are looking for, and the only cheap option is to use some of those "motorcycle amps" on ebay, or something like the super-small amps in the mp3car store(also available on ebay-- possibly closer to you)
    Thanks for the post soundman98, you're not too late from the point of me having plugged anything in, but I did receive the unit in the post the other day. I thought i'd struck gold when I found it, and as it didnt say anything about high levels on both the RCA and speaker, I (obviously wrongly, doh!) assumed the RCA wouldnt be high level, and using the four pots I could ramp up the signal going to the amp. What do you think would happen if I did connect it? Would it work, but be just like connecting the pc to the stock amp (very quiet)?

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