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Thread: Subwoofer problem with Laptop CarPC

  1. #11
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    How would I ground a Laptop? I dont really understand lol..

  2. #12
    Car Audio Moderator durwood's Avatar
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    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.

  3. #13
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    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. ;)

  4. #14
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    [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.

  5. #15
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    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..

  6. #16
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    Glad you got it figured out!

  7. #17
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    Well ok im back with a problem.. Does road runner have some kind of Auto Mic unmute command/feature.. Whenever I mute the Mic in windows.. I open Roadrunner and it unmutes the Mic... Its quite annoying, becuz if I do it, when it comes back into Hibernate, it becomes unmuted again... Thought i had it solved, but apparently not..

  8. #18
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    Quote Originally Posted by Iceplayagt14 View Post
    Well ok im back with a problem.. Does road runner have some kind of Auto Mic unmute command/feature.. Whenever I mute the Mic in windows.. I open Roadrunner and it unmutes the Mic... Its quite annoying, becuz if I do it, when it comes back into Hibernate, it becomes unmuted again... Thought i had it solved, but apparently not..
    Usually (i think), RR mutes/unmutes the mic for satellite input...otherwise, in my prior RR setups, RR doesn't do anything with the mic input. Check setting under "SAT" in RR configurator, there should be a check box or some such...I don't know what other events would trigger this behavior, besides maybe Winamp being opened and set to listen to the mic input somehow.

    That's one of my problems with using the mic input at all, the way RR is set up to mute/unmute is a toggle command that can get "mixed up" depending on what you do inside or outside RR with the mute checkbox in the Windows mixer.
    I have too much time and too little aggravation in my life, so I built a carPC. ;)

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