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Subwoofer problem with Laptop CarPC

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  • Subwoofer problem with Laptop CarPC

    I just finished hooking everything up into my car, running wires, and such. When I went to flick the switch for my subs to turn on, The subwoofers dont beat with the Music, its just a constant loud hitting sound...I have A 3.5mm to 2 RCA output cable that splits into two ways, adapters into four wires to 4CH Speaker Amp, than one wire into two wires to my subwoofer amp.. Anyone know whats going on? Thanks

  • #2
    Id say that the gains on your amp are messed up. They need to match the preouts on your hu.

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    • #3
      Could be the RCA from the 1st amp to the 2nd... If you have a short in this cable then it will "pop" your speakers... sort of like your talking about... probably wouldnt be constant tho... try running a different RCA - if that doesnt work then try a seperate input ( ipod with a line out converter etc ) to just the 2nd amp and see if it works.

      I would be guessing your using the "pass through" on your 1st 4 channel amp to pass the signal to the 2nd? there may be something wrong with the pass through... try running the RCAs straight to the sub amp instead of through the 4 channel...

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      • #4
        sounds to me like rca cables are grounded
        a diagram or some more details would be very helpful

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        • #5
          Definatley sounds like a ground issue to me. Check your cables and your grounds.
          Dick
          08 Dodge Ram QC

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          • #6
            Ok got time to fiddle with the setup today..I plugged the cable into my Ipod than my subwoofer amp and It worked perfectly.. Than back into the laptop, When plugged into the laptop on low low volume it hits normal, than when i start turning the volume up, the woofers go crazy..

            Here is the diagram of my setup.




            Any help would be appreciated, thanks!

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            • #7
              I don't think you can take a 2-channel signal and split it to more than two without a preamp. This will cause ditortion eh especially what comes out of the laptop. Try using just 2-ch's then see if you can get it to a higher volume with out distorting and take it from there..
              • If you don't get it the first time around, go get seconds..

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              • #8
                yeah splitting 2 channels to that amount is definately not good - you will get major interference - if your sound card has more channels then use them - if not i would recommend getting a new soundcard or a line booster / preamp...

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                • #9
                  Take your 2 channel RCA's and run to first amp. Amp should have RCA outputs, run RCA's from first amp to second amp selecting low pass or high pass as applicable.

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                  • #10
                    Splitters can be used regardless of what other users have said. There will not be any real loss of signal to notice any kind of difference since it is such a high impedance output. You will however notice an improvement of sound when using an upgraded soundcard over onboard that has a low signal to noise ratio and uses lower quality components.

                    Do you have solid grounds on both amps and the computer? You might also have a bad rca cable. Have you tried a different cable?
                    System always under construction


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                    • #11
                      How would I ground a Laptop? I dont really understand lol..

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                      • #12
                        The power supply that powers the computer. Make sure you have the amsp and such grounded to BARE metal (no paint) and use a star washer for good measure.
                        System always under construction


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                        • #13
                          Your subs go crazy when the volume is turned up? Doesn't sound like a ground issue or bad cable to me, sounds more like a settings or connection problem on the amp. Your grounds are at least adequate to allow the laptop and amp to turn on, and your signaling is such that your other amp is at least working, and your sub amp is obviously getting something....so let's solve the more pressing concerns first. Gain setting was mentioned before. Improperly set, and the subs will go to max excursion on loud bass hits when the volume is turned up, but seem normal at low volumes...sounds like what you're experiencing...remember that gain is how you match one component to another, not a volume setting...and don't take gain setting on one amp in your system and think it tells you anything about how another setting on another amp should look. Also be sure that subs are crossed over correctly (either from the sound card or using the amp's built in crossovers..and be certain you're using the proper outputs on the laptop, and that the laptop audio is set up correctly for the desired signaling). You also need to be certain that if you are using more than one sub, they are connected, series or parallel, in a configuration your amp can handle.

                          Fourth, you need to be certain that your subs are wired in phase with each other. Out-of-phase subs in the same box work against each other and can be overdriven very easily without putting out much bass at all...instead of working together, they work against each other and produce little to no sound pressure change (situation is worse if they are sharing the same sealed enclosure, it's like revving a motor in neutral). Verify this with a small battery ("AA", 9v, etc.) connected briefly to each set of wire leads going to the subs...disconnect each sub from the amp and with the "+" side of the battery applied to the wire you're using as positive, and the "-" of the battery applied to what you have marked as the negative wire lead, verify that for each wire lead for the subs you connect in this manner, you get the speakers to move in the same direction, forward or back (once you hold the wire leads to each end of the batter, you should see the sub move out or in...make sure that movement is the same for each sub in the system...if it isn't, flip the wire leads either at one of the subs or on the amp, and re-mark your wires so that they are consistent). If you only have one wire to the sub box, verify that a battery across this wire causes both subs to move in a like direction.



                          In that diagram, I assume there is another set of two splitters at the "y" in the cable out from the laptop? I'm having a hard time getting a read on how your signalling for he amps is set up, stereo or mono to either/both.
                          I have too much time and too little aggravation in my life, so I built a carPC. ;)

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                          • #14
                            [QUOTE=durwood;1061391]Splitters can be used regardless of what other users have said. There will not be any real loss of signal to notice any kind of difference since it is such a high impedance output. You will however notice an improvement of sound when using an upgraded soundcard over onboard that has a low signal to noise ratio and uses lower quality components.QUOTE]

                            Using splitters is not the problem here. It is how it is wired. He has split the right channel and is feeding one amp of the right channel and split the left channel and feeding his sub amp on that channel.

                            My guess is he is passing a full range signal to his subs causing them to go crazy as volume increases. Make sure your x-over switch on your audiobahn A8000T is set to LPF. Using the amps RCA outs to feed second amp is the way to go. It will shorten his cable runs and he should be able to use the high pass filter on his second 4 channel amp to run his door speakers.

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                            • #15
                              Lol!, well I decide to go into my Audio properties, and I just simply mute the Microphone, and tada, no more problems.. I guessthe Microphone was interfering with signals from the audio out on the laptop, they are close togather after all..But hey Im back to normal.. Thanks guys for helpin me out.. Im soon going to get a external sound card, becuz im a Sound quality freak...And i will probably eventually run into problems once I decide to set up Freephone, becuz that will require a mic.. But for now, Im good.. Lol thanks


                              BTW, Thanks Hithere, learned some new stuff from your post..

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