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car audio question, that may be dumb (You Have Been Warned)

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  • car audio question, that may be dumb (You Have Been Warned)

    is it possible to have two sets of input going to speakers in a car?

    I wanted to hook up the computer, to an amp and then send the output of the amp to the speakers, but i also wanted to keep the functionality of my stock head unit too. So i was thinking of just splicing the amp wires (to the speakers) so both could be connected at the same time.

    I know i would have to mute the computer sound if i wanted to listen to the radio in the car , and vice versa (mute the radio, if i wanted to listen to the carpc), but is this possible?
    I wish i knew how to do fiberglass work...

  • #2
    you could get a couple 4pdt relays and wire them so you can toggle between both inputs. you could also find a a/v switcher
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    • #3
      You could switch it with a dpdt switch. However the audio signals are both analogue so it is likely that it will not matter if you just splice it. The problem with this idea is if you get a signal peak for both the carputer and the headunit at the same time. The signals are summative so 2-5 V from the headunit and 2-5 V from the carputer = 4-10 V recieved at the amp. If you plan to have the carputer on anyways it may be better to just connect the headunit into the microphone input of the carputer. If i remember correctly, by default windows automaticallty passess the microphone inputs through to the speakers. This solution will interfear with the performance of voice command software.



      (if you are listening to my advise you are listening to a drunk. You have been warned!)

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      • #4
        haha...drunky!

        the one problem with the dpdt switch is that you'd have to run the cable all the way to the switch then all the way to the amps. if you use a relay you can mount it close to the amp and just run a single wire from the relay to the toggle switch.
        New System in progress:
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        Phaze TD1500 ~> Dynaudio MD130
        Phaze TD1500 ~> Seas g18rnx/p
        Zapco Ref 500.1 ~ 12" tc-9
        Behringer DCX2496 ~ Envision Electronics psu
        Transflective Xenarc

        My Car Pc Install
        My Boat Pc worklog

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        • #5
          Normally i'd be under the impression that having two amplifiers connected to the same circuit would be a very bad thing to do.

          Do I have it right? You want to connect the outputs of the stock radio AND the outputs of an external amplifier to the speakers?

          Can someone else say if i'm wrong or not? I would think that having one amplifier backfeeding into another amplifier would probably blow something up.

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          • #6
            Just use an a/v switch like scott said.

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            • #7
              Okay, just to be sure, this guy is talking about combining the AMPLIFIED SIGNAL WIRES from the OUTPUT of his AMPLIFIER and HEADUNIT.

              These are not line-level signals. Putting them through an 'A/V' switch is not an idea i'd reccomend.

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              • #8
                I was under the impression he wanted switch between the sound card output and the hu output.

                Edit: Ok, I reread it and your right so the a/v switch is a no go.

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                • #9
                  Don't do this. As Jahntassa has pointed out, you're dealing with amplified signals and that's a lot more power that just the line levels coming out of a sound card.

                  If you did want to do it, you'd need a heavy duty relay to switch the amplified signals to the speakers.

                  I do have a question, though. If you already have an amplified head unit, why do you also have an amplifier? Does the head unit not run into the amplifier? If it doesn't, then what is the amplifier amplifying?
                  Originally posted by ghettocruzer
                  I was gung ho on building a PC [until] just recently. However, between my new phone having internet and GPS and all...and this kit...Im starting to have trouble justfiying it haha.
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                  • #10
                    Why don't you just run the head unit signal into soundcard? If you only have high lever outputs you could get a level reducer.
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                    • #11
                      yeah, either that, or if you want to be able to use the radio independantly of the pc at times, the logical thing to do is to drop the factory head down to line level, then feed that into the amp as well, so the whole system is from the one amp, the switching is just done before the amp, input a or input b,... no problems..
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                      • #12
                        Originally posted by turbocad6 View Post
                        yeah, either that, or if you want to be able to use the radio independantly of the pc at times, the logical thing to do is to drop the factory head down to line level, then feed that into the amp as well, so the whole system is from the one amp, the switching is just done before the amp, input a or input b,... no problems..
                        i guess i read his post wrong...woops.. anyways. I would modify your approach to how we described. switch before the amp, not after
                        New System in progress:
                        M10k
                        Phaze TD1500 ~> Dynaudio MD130
                        Phaze TD1500 ~> Seas g18rnx/p
                        Zapco Ref 500.1 ~ 12" tc-9
                        Behringer DCX2496 ~ Envision Electronics psu
                        Transflective Xenarc

                        My Car Pc Install
                        My Boat Pc worklog

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                        • #13
                          Originally posted by scott_fx View Post
                          i guess i read his post wrong...woops.. anyways. I would modify your approach to how we described. switch before the amp, not after
                          I read it wrong at first too

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                          • #14
                            Your choices are:
                            1) Get rid of the amplifier and get an Aux In Adapter for your head unit.
                            2) Get rid of the head unit and just use the amplifier
                            3) Hook up the head unit(line out) and computer (line out) to the amplifier with an AV switch
                            4) Get an Aux In Adapter for your head unit. Then hook up computer->headunit->amplifier
                            5) Leave the head unit hooked up the front speakers, and use the computer and amplifier with the rear speakers (lol..just kidding)

                            Peace.
                            ** Denotes an "in car" post
                            In-Car posts made from passenger seat - Be safe, Don't Post and Drive.

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                            • #15
                              thanks guys...
                              i guess its back to the drawing board
                              I wish i knew how to do fiberglass work...

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