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Alpine 7893 and up Time Correction values

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Old Aug 26, 2002 | 12:49 PM
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Lions3's Avatar
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Post Alpine 7893 and up Time Correction values

For my 95 TA convertible, I did the math and found the time correction values to be 6.1 milliseconds for the front speakers, and 8.7 milliseconds for the rears. If you have 6x9's in the back (for hatch models), the correction values will be different. I can give approximate values if they are needed. Once these values are set, there is a vast difference in sound imaging and staging. It really does sound better.
Old Aug 26, 2002 | 01:04 PM
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Sweet man, I was waiting for you to post these #'s . But would each speakers time correction be different?
Old Aug 26, 2002 | 02:09 PM
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Since the formulas are all based on the distances between each speaker and the intended listening position, the two front speakers would have the same values and the two rear speakers would have the same values. If you take measurements sitting in the drivers seat, they would all be the same as the measurements you would get sitting in the front passenger seat. You really only need to measure out and do the math for two of the listening positions, because the time delay for both front channels would be the same as would the rears.

The only time you would have 4 unique time correction values would be if your front left speaker was in the kick panel, your front right was in the dash, your rear left in the trunk and your rear right on the floor. That would be because each speaker is set at different distances to all the other speakers.

I hope this made sense, but if it doesn't, just trust me that the fronts would have the same value and the rears would have the same value

[This message has been edited by Lions3 (edited August 26, 2002).]
Old Aug 27, 2002 | 08:45 AM
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The time delay on the rears would be less than the fronts wouldnt it? What you are doing is effectively moving the speakers away from you, you want the farthest speaker to have the lowest time delay, then space out the closest speaker to you (the front left)

Also, I set mine up so both sides were the same, but if you wanted better sound in the driver seat the right-left delays WOULD be different so they hit your ears at the same time.
You'd need to delay the FL speaker, and delay the FR speaker a little less. Unless I'm missing something here.

Old Aug 27, 2002 | 01:33 PM
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The manual gives you two ways of setting up the time correction. The first is for one listening position, which would give you different delay values for each speaker. The second is setup so that you find a happy medium so that all of the listening positions are roughly the same. I chose the latter.
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