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Thread: Subwoofers vs. Hard drive

  1. #1
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    Post Subwoofers vs. Hard drive

    Has anyone had problems with subwoofers near a hard drive in the trunk of a car? I've noticed that skipping and freezing is getting worse and worse lately. It only tends to happen when large bass notes hit.

    Does anyone know any ways to work around this problem? Or is the hard drive being progressively damaged? The HDD is a Western Digital 20gb model. I have two MTX 12" subs.

    Would mounting the hard drive farther away from the subwoofers lessen the blow of the vibration? Thanks

    [ 08-07-2001: Message edited by: BoominVolvo ]
    BoominVolvo
    http://olymp3.mp3car.com

  2. #2
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    How far away are they now?

    Scott--
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  3. #3
    Variable Bitrate
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    i have mine mobo and harddrive mounted INSIDE my subbox.
    its in there for aprox 3 months now.
    haven't had any bad experience yet.
    time for the sig:

    '00 VW golf TDI upped to 130 HP - 18" RS 6 wheels - liliput 7" tft in indash housing - epia 10K - SB audigy - caliber 1 fahrad CAP - RF punch amp - hollywood 1.6K mono amp - boston acoustics pro - RF 10" DVD sub

  4. #4
    LimpBagel
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    Umm I would think inside the box is a BIT close. You are most likely killing your hard drive.

  5. #5
    Variable Bitrate
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    Wink

    my mate has the same setup for over a year now.
    he has his drive (same maxtor drive) hung up in springs inside his subbox.

    same story, no problems.
    for your info: both subs are 10" subs.
    time for the sig:

    '00 VW golf TDI upped to 130 HP - 18" RS 6 wheels - liliput 7" tft in indash housing - epia 10K - SB audigy - caliber 1 fahrad CAP - RF punch amp - hollywood 1.6K mono amp - boston acoustics pro - RF 10" DVD sub

  6. #6
    Retired Admin Aaron Cake's Avatar
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    Cool

    First, search the forum. There have been long discussions on this in the past, with mixed results.

    I tend to think that there's no point in subjecting hardware to excessive stress, so you should move the stuff away from the subs. Your freezing problem just sounds like something is loose, and being jarred when the bass hits. Check memory, cards, etc. And run a surface scan of the HD to check for bad sectors.
    Player: Pentium 166MMX, Amptron 598LMR MB w/onboard Sound, Video, LAN, 10.2 Gig Fujitsu Laptop HD, Arise 865 DC-DC Converter, Lexan Case, Custom Software w/Voice Interface, MS Access Based Playlists
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  7. #7
    Constant Bitrate
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    If you can run your system inside a sub box .. you have problems.

    Firstly .. the subwoofers must not be very large .. as the magnets WILL distort IDE communications when in close proximity.

    Secondly .. subwoofers require a highly specific airspace (typically within 10%) and unless you have taken the total computer volume in consideration when custom building your sub box .. you have most certainly changed your box specs.

    Thirdly .. excessive vibrations will definately shorten the MTF of a harddrive (let alone other components) .. unless you are running mil. spec. _everything_ .. something is bound to fail.

    Quatrenarily .. unless the box is ported .. you are lilely to have air leaks which will adversely affect your sound. If the box is sealed .. you are subjecting your system to higher temperatures than are within spec.

    Lastly .. whatever happened to a good, clean install ?
    -James-

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  8. #8
    Maximum Bitrate PoBoy's Avatar
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    I tend to think that there's no point in subjecting hardware to excessive stress, so you should move the stuff away from the subs.
    My 2 15" destroyed my first comp basically. I threw it out and built a new one. Now, its as far away from my subs as possible. But its still not safe if I crank it. Rule of thumb, if you can feel any sort of vibration on your seat, hair, or your eyes are just popping out as your ears go numb, your HD is in big trouble. Its not the big bangs that really do the damage (they just make things loose), its the constant little ones that you would not normally hear when you are listing at normal volume levels. When cranked, its like driving down a "washboard dirt road." Those constant little vibrations are the ones that will cause your hard drive to soon become destroyed. Aaron is prob right about those big base hits. They are causeing something to get loose. Get some hot glue on your connections to keep them in place.

    How to get around the problem besides moving away from the subs?? GET past that "louder is better" phase and turn it down a notch. Go for quality highs with some solid base. Something that will make Metalica S&M sound smooth. That or stock up on cheap HDs and be prepared to buy a hearing aid at age 25.

    PoBoy
    I'm a ghost...email me if you have any questions on my old setup

    My way outdated website: http://www.poboytech.net

    FYI: I sold my 96 4Runner and bought a 1985

  9. #9
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    Originally posted by PoBoy:
    <STRONG>be prepared to buy a hearing aid at age 25.</STRONG>
    HUH??? WHAT?? I DIDN'T HEAR YOU! hehe... Really though, inside a sub box is too much. You have to deal with resonance as well as magnetic fields... Both are bound to make it go snafu..

    jamesb seems to have done the best at breaking down the bad points. I'm sure the bad outweigh the good "point" of being able to find an out of the way place to install the comp. Use a little imagination and get creative.

    Back to PoBoy.. Yes yes, SPL is not everything, and you will go deaf. I've been through the whole "Lets see what I can blow off my car with bass" phase... Blew the rear view mirror right off the blasted thing, and the rear window seals started getting iffy. But past that is SQ. Let's think here. Do we want something destructive, or do we want to hear what music SHOULD be like.

    So what's my system? 1100watts of pure thumpin RMS power (That's around 2200watts peak)! that goes to 4 mids, 4 tweets, and a single 12" DVC sub that's sucking 500watts RMS of the total power. Always match your systems RMS needs.

    Scott--

    [ 08-09-2001: Message edited by: DarkWolf ]
    -=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-
    97 Firebird Formula Convertable - Project R/T
    Project R/T SoundDomain Page
    -=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-=~=-

  10. #10
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    If I remember correctly, hard drives are much less tolerant to vibrations than they are to shock loads. As an example, I looked up a WD Caviar WD300AB:

    Environmental Specifications

    Shock
    Operating 65G, 2 ms (read); 20G, 2 ms (write)
    Non-Operating 250G, 2 ms
    Note: Half-sine wave, measured without shock isolation and without non-recoverable errors.

    Vibration
    Operating Linear: 5-500 Hz, 0.25G (0 to peak)
    Random: 10-300 Hz, 0.004 g2/Hz
    Non-Operating 5-20 Hz, 0.195 inches (double amplitude)
    20-500 Hz, 4.0G (0 to peak)
    Sweep Rate 0.5 octave/minute minimum

    I would associate a road bump to a shock load, where a sub (operating from ~25 Hz to 80 Hz) a vibration.

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