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Thread: Time Delay

  1. #1

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    Default Time Delay

    I could some help getting mine right.
    HU- Alpine CDA-9813
    Amp- Alpine MRVF 357 5ch 40x4- 120x1 sub
    Front Speakers Polk DB6750 - 6 3/4 componants
    Rear Speakers Polk DB460 - 4x6 coaxial
    Sub Polk -MM2104 10in sealed encloser
    This is in a 1998 ext-cab Pickup all speakers in factory locations.
    RF- 60in.
    LF- 42in.
    RR-48in.
    LR- 30in.
    These distances are from speaker to center of driver seat where my head is located:o..

    Any help would be great, Thanx
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  2. #2

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    Quote Originally Posted by billz428 View Post
    RF- 60in.
    LF- 42in.
    RR-48in.
    LR- 30in.
    These distances are from speaker to center of driver seat where my head is located:o..
    Well, according to my HU manual, the equation for timing setting is:
    A = (B - C) / 34
    A: Delay time (ms)
    B: Distance from listening position to furthest speaker (cm)
    C: Distance from listening position to the speaker to be adjusted (cm)

    Essentially your farthest speaker would be offset at 0.0ms and everything else is 'pushed back' from you listening position. If you have a sub that is farther than your RF speaker, that should be 0.0. You will have to convert the distance to centimeters also or else this function will not work. I dont know the one for inches.

    I'm too busy at work right now to do the math for you too. :p
    /////ALPINE INA-W900 HU
    /////ALPINE PXA-H100 DSP
    polkaudio SR5250
    JL Audio HD600/4
    polkaudio SR124DVC
    JL Audio HD750/1

    "In this house, we obey the Laws of Thermodynamics!"

  3. #3

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    Cool!!
    1in=2.54cm TD is Time Delay

    RF-60in=152.4 TD=0.0
    LF-42=106.68 TD=1.34
    RR-48=121.92 TD=.89
    RL-30=76.2 TD=2.24

    Well, according to my HU manual, the equation for timing setting is:
    A = (B - C) / 34
    A: Delay time (ms)
    B: Distance from listening position to furthest speaker (cm)
    C: Distance from listening position to the speaker to be adjusted (cm)
    When you get a chance please check my math:o.

    Thanx for your help.
    Last edited by billz428; 07-10-2008 at 01:44 PM. Reason: misspelling

  4. #4

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    For the "easy way" to set up the time alignment, sit in the driver's seat, select a mono source (AM radio) with talk radio, enter the T/A function...slowly add delay incrimentally to the left front channel until the spoken voice clearly sounds like it's coming from dead center in the dash (or dead center in front of your listening position if you prefer, but some feels this mucks with staging).

    BTW- I had a 9813. Nice head unit.
    -------------------------------------------------------

  5. #5

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    Quote Originally Posted by billz428 View Post
    When you get a chance please check my math:o.
    Looks right to me. You will find that Greg is also correct. This calculation is just a solid starting point. After I set mine using the math, I moved them + or - a few increments to adjust them how they sounded best.

    Your head is almost never exactly where you measured all the time.;)
    /////ALPINE INA-W900 HU
    /////ALPINE PXA-H100 DSP
    polkaudio SR5250
    JL Audio HD600/4
    polkaudio SR124DVC
    JL Audio HD750/1

    "In this house, we obey the Laws of Thermodynamics!"

  6. #6

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    Thanx Guys.

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    Check out Alpine's i-personalize on their website. Plug in all the measurements and itll give you some very good starting points.
    polkaudio sound quality competitor since 2005
    MECA SQ Rookie of the Year 06 ~ MECA State Champ 06,07,08,11 ~ MECA World Finals 2nd place 06,07,08,09
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    polkaudio SR6500 --- polkaudio MM1040 x2 -- Pioneer P99 -- Rockford Fosgate P1000X5D

  8. #8

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    Thanx Macleod, made it way easy.

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