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Thread: Lost my audio signal to Sub Amp

  1. #1
    Newbie jpmack's Avatar
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    Lost my audio signal to Sub Amp

    I am running the ZOTAC NM10-A-E Intel Atom D510 which has Realtek ALC662 5.1 channel HD audio on board. My current setup has 2 amps, 1 amp to the sub, 1 amp to the four component(doors) speakers.

    The onboard audio has (3) 3.5 audio jacks onboard(pink/green/blue). My understanding is that these three jacks offer a total of 6 Channels(5.1), two channels per jack:

    1. The top jack(blue) is rear left and rear right.
    2. The middle jack(green) is front left and front right.
    3. The bottom jack(pink) is center and and subwofer.

    Am I correct on that part?

    Below I have attached a drawing of my setup:


    Does this look correct?


    My issues:

    1. With the sub hooked into the pink port i get no audio from the sub! I did at on time have sub audio from this jack. I double checked the cables, amp and sub and all still work. I did this by hooking the sub/amp to a different jack and got audio. Any ideas here? Is this settings somewhere in the software that are messed up?

    2. When I have the rear speakers hooked into the blue jack i get audio but don't get all the audio (if that makes sense). What i am trying to say is that i will get some audio(music) but no vocals. The only vocals i get is through the center(green) jack.

    Hope someone can help me, i've been spinning my head for the last week trying to figure this out!
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  2. #2
    FLAC freeflashstuff's Avatar
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    Have you played with any of the sound card's software settings yet? Most of them will try to auto-configure the 5.1 settings in an effort to "help you"...


    Sent from my iPhone using Tapatalk
    I have bad luck with vehicles...

  3. #3
    Newbie jpmack's Avatar
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    I've played around with the Realtek Audio Manager that was in the control panel for the past week, haven't had any luck!

    Not exactly sure what I am doing!

  4. #4
    Variable Bitrate djvillar's Avatar
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    What OS are you running?

    For Win7 you have to go to the speaker config and check "fill" to use the rear speakers when not playing something with 5.1. The "fill" option duplicates sound form the front speaker to the rears. Also go to the realtek config and switch the sub/amp signal and see whether you get sound.

  5. #5
    Newbie jpmack's Avatar
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    Quote Originally Posted by djvillar View Post
    What OS are you running?
    I am running Win7 32 bit.

    For Win7 you have to go to the speaker config and check "fill" to use the rear speakers when not playing something with 5.1. The "fill" option duplicates sound form the front speaker to the rears. Also go to the realtek config and switch the sub/amp signal and see whether you get sound.
    Well i did as you suggested and it kinda worked. In windows Speaker properties I selected the "Speaker Fill" and no have my sub back, and get a little bit of sound from the rear speakers but it is no where near the sound coming from the front speakers. If I take of the "Speaker Fill" I will loose sound at the sub and the rear speakers. Switching the sub/amp signal did nothing.

  6. #6
    Variable Bitrate djvillar's Avatar
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    okay, now go into the window speaker config and boost the rears or bring down the fronts. That would be my first guess. But you have the fronts working and the sub, and the rear, just low db right?,.. Yeah just bump it up or bring everything else down...

    Let me know if this works. I'm using Win7 too and am curious how it turns out. I've never put in the rear stage yet. I have a 5.1 setup, Infinity kappa components in the front and center, 6.5" kicker compvt sub's (2x) in the door (custom enclosure), and am going to put some 6x9 infinity kappa's 3 way in the back.

    I love my ride to and from work every morning. Its just the time in between that sucks.

  7. #7
    MySQL Error soundman98's Avatar
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    some understanding on why this is such a hassle:

    most of the audio sources most use in-car are stereo-- meaning there is only 2 channels of audio..

    pc's in general read that data, and send it where they think is correct-- in most computers, many people just want that audio to play on the 'green' port--or the front speakers..

    car audio is a different beast.. most need/want a duplicate audio signal to feed the rear speakers, and also want the sub port to work-- all off that single 2ch source..

    the easiest way to do this is to use y-adapters off the front speaker output, and use the onboard crossovers, and gain controls on the amps to adjust the sound..

    this method will guarantee that everything will work consistently, no matter what pc settings you have(though you will loose fade, and sub gain control).. i have never had very good luck getting along with realtek drivers, or software, so i prefer to avoid it completely to avoid loosing hair..

  8. #8
    Variable Bitrate djvillar's Avatar
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    If you want pure front and back duplicates, go to the Realtek controller. Then go to the channel tab. You can set each channel by color to whatever you want... go to the blues which I think is the rear, set them to duplicate front. And you still have fade control via windows. Now if you play a movie or dvd you will wan to set it back to "rears" with duplicate.

  9. #9
    Newbie jpmack's Avatar
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    i guess i will do a little more digging around with the realtek software.

    Does anybody know what is causing a hissing sound from the speakers? It is most noticeable when i have the volume all the way down.

  10. #10
    MySQL Error soundman98's Avatar
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    possibly the amp gains too high

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