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  • Need some help with sending audio to stock amp

    Hey all...

    I have a 2001 Nissan Pathfinder which has a stock external amplifier. I have found following info on www.installdr.com :

    "Most Nissan Pathfinders will have an additional amplifier connected to the Nissan stereo. This amplifier will power the speakers inside the vehicle instead of the amplifier inside the radio.

    The Install Doctor recommends “integrating” into this Nissan amplifier when wiring the new replacement radio. This means that the Nissan amplifier will power the speakers in the vehicle instead of the amplifier inside the new replacement radio.

    To “integrate” into the Nissan amplifier you will simply wire the new radio just as you would if there was no amplifier in the vehicle.

    The only difference in the wiring is that you will need to activate or turn on the amplifier when the new radio turns on. In order to turn on the Nissan amplifier, two wires in the wire harness connector in the dash need to be connected to the new radio.

    These two wires are located on the smaller of the two white connectors of the radio wire harness located in the dash. One of these wires is a (+) 12 Volt wire which connects to the new radios power antenna turn on wire (some new radios may actually have an amplifier turn on wire in addition to a power antenna turn on wire). This wire will tell the Nissan amplifier to turn on and off when the new radio turns on and off. The second wire, also located on the smaller of the two white connectors, is a (-) Ground wire for the Nissan amplifier. This wire needs to be connected to the new radios Ground wire.

    If you follow The Install Doctors installation procedures and mount your new radio to the metal brackets originally mounted to the Nissan radio, you will actually ground the radio through the metal brackets when the brackets are screwed into the dash.

    Connecting the Nissan amps ground wire to the new radios ground wire will ground the amp as well through the metal brackets.

    This method is probably the best method to connect and turn on the Nissan amplifier and does not require alot of additional wiring."




    Now my question is this, is there any way to hook up my audio out on my EPIA board to the speaker wires so that the stock amp can power the speakers?? (my head unit will be removed)

    The area that I am concerned about is the fact that a stereo output from the computer has 2 wires (one for left and one for right), but speakers in a car have 2 wires each (one for - and one for +).

    I have heard stories of car stereos blowing up if you run the ground wires together rather than each to their own wires.

    Any info on this would be greatly appreciated!!

    Cheers all!
    OrangeWhip? OrangeWhip? 3 OrangeWhips!!
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  • #2
    "there any way to hook up my audio out on my EPIA board to the speaker wires so that the stock amp can power the speakers?? (my head unit will be removed"

    Probably. I believe crutchfield.com sells an adapter that allows you to use the stock amp with an aftermarket head unit. Adapt it for your carputer use.

    "The area that I am concerned about is the fact that a stereo output from the computer has 2 wires (one for left and one for right)"

    Been awhile since I spliced a mini 1/8" cable, but I'm pretty sure there were at 3 if not 4 wires. R+, L+, and either a common ground or L/R -. Either way, the 1/8" to rca adapter should take care of it.
    -TJ
    Smart Playlists Plugin for RoadRunner
    CarPC - 05 Acura TL Navi (pics soon)
    Retired CarPC - 03 Infiniti Qx4

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    • #3
      I asked this question a few days ago and someone suggested a two cahnnel in / four channel out EQ. Would work for me except I need sub out also. There is a product by eclipse, it is a two channel in? five channel out EQ. I found it on ebay. You might try looking there.

      Peter
      Stop Buying New Music CD's.
      Hit The RIAA where it lives.

      Indash Motorized 7", Epia Nehimiah, 512 MB, 80 GB, DVD, Wireless G, XP Pro, XM PCR, Kenwwod 5 Channel 1200 Watt Amp.

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      • #4
        Thanks for the info all. I think I will try to search for an adapter at crutchfield.com cause I don't have too much room for a EQ anywhere since my carputer takes up most of the room.

        Cheers!
        OrangeWhip? OrangeWhip? 3 OrangeWhips!!
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        • #5
          my wife has a pathfinder that i have installed 2 alpine cd players in. her 2 amps are located on the inside hump of the right rear wheel behind the panel. she has a 1994. it is definently common ground so you should be all right.
          99.9% complete.

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          • #6
            Well I just went to an electrical/audio repair place and they said as long as I hook just the + of the RCAs to the speaker wire that is going to the amp I should be fine. They say that because it is just a signal that is being sent and not overly amplified power to speakers.

            Does this sound right??
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            • #7
              yes-because it is a common ground. kinda like if you dont ground your deck but it works because it is getting its ground from the antenna. your sound card has a stereo jack in it right--so just use that. get a stereo mini plug to stereo rca's cable and you'll be all set.
              99.9% complete.

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              • #8
                Yeah I am using the Epia 10000. So if I want to try to have front and rear channels as well can I use 2 outputs (that I will adapt to RCA) and send them to the appropriate speaker wires running to the amp? I know with the Epia 10000, if you use all 3 sound connectors (Out, In, and Mic)you get 6 channel audio OUT, but I want 4 channel. Is there a way to do that still? I would like to keep one of the inputs alive still as I want to hook up a D-Link FM radio.

                Cheers!


                *edit* Also on a side note, to hook up the positives only I just use the middle wire on the RCA connectors correct?
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                • #9
                  So you are going to ground your RCAs is that what I understand? What are you going to ground it to? Chassis or motherboard? Other end is Amp I presume.. ??

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                  • #10
                    From what I understand, there is no grounding of the RCAs at all. Just run the + wires to the wires running to the amp.

                    Somebody correct me if I am wrong here.
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                    • #11
                      I don't mean to rain on the parade here, but if I'm reading this correct, it says connect an aftermarket radio as you normally would. This indicates to me that the Nissan Amplifier is actually taking it's signal from speaker level signals. Your mobo is outputting line level signals. There may be a buffer circuit of some sort inside the amplifier and an automatic gain circuit that will allow the use of a line level signal, but I'm not too confident about it.

                      Also, assuming that you had a "regular" aftermarket amplifier, you would still need to connect both the signal and ground to + and -. If you don't, you'll probably get a lot of hum. It may work, it may not, but that ground (-) is the reference for the music signal.

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                      • #12
                        Did you get that 1/8" stereo -> Dual RCA jack yet?

                        I have one and I have a lot of line noise now.. I tried both with my laptop and a RIO mp3 player. Both had similar line noise.

                        If you splice wires into line level inputs, my guess is you'll get insane hum/line noise...

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                        • #13
                          So my only option is to get an aftermarket amp??
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