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Thread: can a carputer compete with a head unit for sound quality?

  1. #381
    Low Bitrate Ub312g0d's Avatar
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    I would have figured a good quality inverter with additional filtering wouldn't be too bad noise wise. Of course they're is always the option of building a custom power supply for whatever device, be it a dedicated DAC, rackmount hardware, or other product. Its not difficult at all and is widely documented on how to properly step up DC voltage while keeping noise at a minimum. look at diy car amp power circuits for this.

  2. #382
    FLAC
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    Would it be as simple as using a pure sine wave power inverter or could that still create noise?
    Just wondering.

  3. #383
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    a good quality inverter?

    an inverter that's high enough quality is EXPENSIVE and just simply not necessary, not to mention the risks you take by running an inverter in the car and introducing noise simply isn't worth it....

    install everything, start it all up, and have noise due to the inverter....then what?

    if you eliminate the inverter from the start, then it's not a problem

    an inverter is an old school solution to the problem, there are MUCH better ways out there now.
    Jan Bennett
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  4. #384
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    Are you running the Apline 701 with or with out the controller?

  5. #385
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    you MUST run it with A controller.
    Jan Bennett
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  6. #386
    Super Moderator. If my typing sucks it's probably because I'm driving.... turbocad6's Avatar
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    ...unless you have a compatible alpine head unit....

  7. #387
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    Thats what I thought! As from memory thats where you turn the volume up or down?

  8. #388
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    Quote Originally Posted by AndrewK
    Thats what I thought! As from memory thats where you turn the volume up or down?
    You can turn the volume up and down on the controller or the compatible headunit.

    Hey Jan, do you always use the volume knob on the controller or do you ever just set it and use the volume on the PC?
    I'm finding that if I set the volume on the controller (fairly high to get enough volume) and then use the PC to control the volume the quieter passages have a noise floor that is pretty noticable. If zero bits are passed for about 3 seconds the 700 shuts off the output and the background noise disappears. It's becomming a bit of an issue. I know it wouldn't be if I just used the 700 controller knob like I'm sure you did when competing.

    Anyway, does anyone know if the SPDIF output from a different sound card would make a difference?
    Maybe I just need to go through the system and readjust all the signal levels? I think they are all set correctly though. Any suggestions?
    1999 Black Pontiac Trans Am
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    How To Relocate Climate Controls on the 97-02 F-body Cars
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  9. #389
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    Quote Originally Posted by JasonWW
    Hey Jan, do you always use the volume knob on the controller or do you ever just set it and use the volume on the PC?
    I use the controller exclusively.

    Controlling volume on a touch screen is not very easy to do at all.

    I'm finding that if I set the volume on the controller (fairly high to get enough volume) and then use the PC to control the volume the quieter passages have a noise floor that is pretty noticable. If zero bits are passed for about 3 seconds the 700 shuts off the output and the background noise disappears. It's becomming a bit of an issue. I know it wouldn't be if I just used the 700 controller knob like I'm sure you did when competing.
    it's there, and it's very simple to use.

    Controlling volume on the PC is a PITA IMO.

    Maybe I just need to go through the system and readjust all the signal levels? I think they are all set correctly though. Any suggestions?
    have yous et your gains correctly on your amps?
    Jan Bennett
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  10. #390
    FLAC
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    Quote Originally Posted by Red GTi VR6
    Controlling volume on a touch screen is not very easy to do at all.
    I don't use the H700 controllers' volume because I have buttons in the steering wheel I prefer to use and they control the PC.
    Quote Originally Posted by Red GTi VR6
    have you set your gains correctly on your amps?
    I think so. There's not many devices in the signal chain unlike my older sound systems. There are the volume controls in the PC, such as WAVE, MASTER and SPDIF. There is the volume of the H700 which is 0-35 and then there is the amplifier gain.
    If I set the PC volumes to max and the H700 to 35 my speakers output levels are at about their limit. So if I turn the amp gain down any, I will not have enough volume, but at 35 the background noise is noticable so I tend to keep it at about 30. The backgorund noise is harder to hear, but I don't have full volume ability which isn't so bad most of the time.
    I suppose if I turn the amp gain up a little I will be able to get full volume again (with the H700 set at 30) but the background noise should increase along with it. So I'm back where I started.
    I wonder if I can turn the PC volume down just a little and turn the amp gain up leaving the H700 at 30. I THINK the noise floor will be the same as I don't see why it wouldn't be.

    This whole SPDIF format is still pretty confusing as far as the details. Maybe my noise floor can be lowered with a better sound card? That's what I'm thinking. Assuming the H700 has clean output at 35, I can leave it there so as to keep my amp gains as low as possible while still being able to get full volume from the speakers.

    How does your system do on some of those test tracks that has the sound slowly get softer while your volume is maxed? Is your noise floor noticable?
    1999 Black Pontiac Trans Am
    CarPC's in F-bodies
    How To Relocate Climate Controls on the 97-02 F-body Cars
    (AMD Sempron 3000+, Opus 150)
    Car PC system is out, Alpine system is in.

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