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Thread: bye bye noise

  1. #11
    FLAC greatwhite's Avatar
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    Quote Originally Posted by FPeter View Post
    metal to metal? the case of the amp should not be grounded! this is a very base thing in car hifi topics! in rare cases this can destroy the amp, loudspeakers and the source too! and make fire in the car...
    Ah, no. I think you misunderstood.

    Niether is case grounded.........
    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
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  2. #12
    Variable Bitrate FPeter's Avatar
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    Quote Originally Posted by greatwhite View Post
    Ah, no. I think you misunderstood.

    Niether is case grounded.........
    oh ok...

    but the generator, groundloop noise is one, but several people has others, like HDD,ODD,USB,PS/2,etc I/O-related noise...
    "case": Skoda Superb Elegance 1.8T
    Asrock G41MH-GE, E2180 2GHz dualcore, 1024MB DDR2/800, Samsung F1 750GB/7200RPM/32MB, M4-ATX, Lilliput FA1011 HDMI touchscreen, ASUS Xonar DG PCI, homemade Quectel L10 USB GPS

  3. #13
    FLAC greatwhite's Avatar
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    Quote Originally Posted by FPeter View Post
    oh ok...

    but the generator, groundloop noise is one, but several people has others, like HDD,ODD,USB,PS/2,etc I/O-related noise...
    Yup, had that stuff too, until I cleaned up my install to it's final form. HDD accessing noise was the worst, thought I'd go nuts chasing it down.

    As I said, I'm not saying your hardware won't work, I'm sure it does by going spidf. And, as also mentioned, staying digital as far as possible is another good reason.

    I'm just saying it's not the only way to deal with "noise".............

    Cheers
    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
    Leonardo Da Vinci

  4. #14
    Variable Bitrate eric_barcus's Avatar
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    id agree with great white on the "less" than professinal install, do some further isolation to figure out where your sould issues are comming from, use a differnt audio source, mp3player cd ect, use a dif amp use "straight runs" from the amp to a speaker to see if you have an exposed wire somewhere, when you isolate smartly by taking out one piece at a time you can usually figure it out
    BTW CLEAN install great white

    still a great product thou, small too

  5. #15
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    Heres a good example of how wires should be installed.

    http://forum.sounddomain.com/ubbthre.../1#Post1368137
    [98%]

  6. #16
    Maximum Bitrate bes51659's Avatar
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    what noise is worth chasing?

    Very nice, audiology! Sound insulation to avoid ratle is important and a neglected area.

    And as I've noticed that the fan in the PC box (voompc) makes a lot of noise!

    As you've did, white, with a separate frame for your system and a single ground is the ideel solution but not always possible, and may only be part of the solution.

    I have my PC and my poweramp set up like that (below),
    [media]http://web.comhem.se/mulle1/installationboot_3.jpg[/media]
    , but I still have the problem with the HQCT located elsewhere (below)

    [media]http://web.comhem.se/mulle1/installationboot_2.jpg[/media]

    (I've just installed in car, and did not realize where the problem lye before)

    So I can insulate the HQCT and ground it and power it via cable at the PC to avoid ground loop. Or I can use SPDif as a noise proof link. In fact I might even use such a link for the microphone!

    So I would like to get two pairs, analogue to spdif and back for the HQCT and mic, and one spdif to analogue for the PC to poweramp.
    1) The analogue to spdif should have a preamp for mic.
    2) And if the spdif to analogue had a few steps of amplification +6, +12, +18 dB it would be nice.
    3) They have to be really small, mounted on the coax.

    PC's have spdif out generally and so does USB soundboards. No need to do that again.

    These 5 units would be worth maybe 100$ to me. Wishlist complete :-)

  7. #17
    Variable Bitrate FPeter's Avatar
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    Quote Originally Posted by bes51659 View Post
    ...
    yepp, that link is great!

    there are some small thing about spdif:

    separate spdif lines cant be connected directly because they are independent digital datas with their own clocks, and if you link them together, kills each other. a selector device should be used. and most of the soundcards unable to play directly the spdif in sound to spdif out like the line or mic to analog out. a software should be used that records and plays it in realtime (winamp line-in plugin, windsp, or other). only a few sound chipset handles itself, like creative emu10K1/2 on live, audigy cards, and as i know the advanced xfi cards (not lowprofiles)

    now i use an sb live SB0100 card with kxProject driver, and it has 4 separate stereo spdif out, and 2-3 ins

    the smallest size of the DAC is limited because power supply, digital and analog should be separated to aviod noise, and now i work on a remote modul to switch on/off the DACs
    "case": Skoda Superb Elegance 1.8T
    Asrock G41MH-GE, E2180 2GHz dualcore, 1024MB DDR2/800, Samsung F1 750GB/7200RPM/32MB, M4-ATX, Lilliput FA1011 HDMI touchscreen, ASUS Xonar DG PCI, homemade Quectel L10 USB GPS

  8. #18
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    Quote Originally Posted by audiology View Post
    Heres a good example of how wires should be installed...
    looks ok, but the first thing that caught my eye was the 12v being ziptied to the l. speaker wire. no bueno.

    much better examples

  9. #19
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    Quote Originally Posted by bes51659 View Post
    And as I've noticed that the fan in the PC box (voompc) makes a lot of noise!
    I agree,my voompc-2 fans are too loud 32db I think. I replaced both fans with a 14db replacement fan at a cost of $30, I'm very happy with the results. CFM is about 75% of the original.

    I'm keeping my eye on this thread as I'm always looking for improvement. lol.

  10. #20
    FLAC greatwhite's Avatar
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    Quote Originally Posted by audiology View Post
    Heres a good example of how wires should be installed.

    http://forum.sounddomain.com/ubbthre.../1#Post1368137
    I wonder if that guy knows he cut a major structural panel out of the vehicle just so he could get speakers in that spot?

    I like good sound too, but not enough to compromise the structure of the vehicle.............

    Looks like a nice wiring job though. Crimp and solder, only way to go............
    For once you have tasted flight you will walk the earth with your eyes turned skywards, for there you have been and there you will long to return.
    Leonardo Da Vinci

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