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9887 time correction confusion...
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<blockquote data-quote="bikinpunk" data-source="post: 3710392" data-attributes="member: 568114"><p>#1. measure distance of all speakers.</p><p></p><p>#2. Pick the furthest speaker. This will be your reference point.</p><p></p><p>#3. Take the difference of each speaker from the furthest speaker.</p><p></p><p>The furthest speaker (usually subwoofer) will be 0.00ms on the t/a, so basically you do no time correction for the furthest speaker. The closest speaker to you should have the most t/a since that's the largest difference.</p><p></p><p>This is based on temperature since speed of sound is based on temperature, fyi. But, just assume some temperature for the sake of measurements.</p><p></p><p>For example, the subwoofer is 66 inches and is the furthest speaker. The following is from an excel sheet I made. 2nd number is distance in inches, and 3rd number is time correction in milliseconds (ms).</p><p></p><p>Subwoofer: 66 0</p><p></p><p>Drivers Tweeter: 35 2.295628013</p><p></p><p>Passengers Tweeter: 49 1.258892782</p><p></p><p>Drivers Midrange: 37.5 2.110496722</p><p></p><p>Passengers Midrange: 51 1.110787748</p><p></p><p>Drivers Midbass: 41.25 1.832799785</p><p></p><p>Passenger's Midbass: 55 0.814577682</p><p></p><p>So, you see that the driver's side tweeter (which is the closest speaker to you) has the most t/a @ 2.29ms. The subwoofer has 0 t/a.</p><p></p><p>One thing to keep in mind is reflection. If you have a speaker firing at the windshield you'll want to add some extra distance to account for that the best you can. Also, the excel sheet I use is just to give you an idea of where to start. You should play with the t/a a bit and listen to what you think sounds the best.</p><p></p><p>Also, I actually added about 8ms to every t/a value I calculated so that the sub has plenty of time to get "up front" and doesn't sound like it's coming from behind as much.</p><p></p><p><a href="http://i18.photobucket.com/albums/b138/bikinpunk/timealignmentpicture.jpg" target="_blank"><img src="http://i18.photobucket.com/albums/b138/bikinpunk/th_timealignmentpicture.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p></p><p>If you want a copy of the excel file I'll be happy to e-mail you one.</p></blockquote><p></p>
[QUOTE="bikinpunk, post: 3710392, member: 568114"] #1. measure distance of all speakers. #2. Pick the furthest speaker. This will be your reference point. #3. Take the difference of each speaker from the furthest speaker. The furthest speaker (usually subwoofer) will be 0.00ms on the t/a, so basically you do no time correction for the furthest speaker. The closest speaker to you should have the most t/a since that's the largest difference. This is based on temperature since speed of sound is based on temperature, fyi. But, just assume some temperature for the sake of measurements. For example, the subwoofer is 66 inches and is the furthest speaker. The following is from an excel sheet I made. 2nd number is distance in inches, and 3rd number is time correction in milliseconds (ms). Subwoofer: 66 0 Drivers Tweeter: 35 2.295628013 Passengers Tweeter: 49 1.258892782 Drivers Midrange: 37.5 2.110496722 Passengers Midrange: 51 1.110787748 Drivers Midbass: 41.25 1.832799785 Passenger's Midbass: 55 0.814577682 So, you see that the driver's side tweeter (which is the closest speaker to you) has the most t/a @ 2.29ms. The subwoofer has 0 t/a. One thing to keep in mind is reflection. If you have a speaker firing at the windshield you'll want to add some extra distance to account for that the best you can. Also, the excel sheet I use is just to give you an idea of where to start. You should play with the t/a a bit and listen to what you think sounds the best. Also, I actually added about 8ms to every t/a value I calculated so that the sub has plenty of time to get "up front" and doesn't sound like it's coming from behind as much. [URL="http://i18.photobucket.com/albums/b138/bikinpunk/timealignmentpicture.jpg"][IMG]http://i18.photobucket.com/albums/b138/bikinpunk/th_timealignmentpicture.jpg[/IMG][/URL] If you want a copy of the excel file I'll be happy to e-mail you one. [/QUOTE]
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9887 time correction confusion...
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