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ports size

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Old 03-26-2007, 12:40 AM
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ports size

why do the spl set up use bigger ports

the sq set ups are 3"-4" ports and the spl set ups are 6"
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Old 03-26-2007, 01:39 AM
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because you get less port turbulence with a larger port.
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Old 03-26-2007, 10:16 AM
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While many SQ-type sub systems might not need larger ports...they certainly don't hurt SQ. For SQ, I try to use the largest port possible until it becomes impractical.

Of course there is an upper limit to port size...but the upper limit is pretty big...especially when you consider that SQ-type sub systems usually tune pretty low. Hence the upper limit in terms of SQ is usually a non issue.

For more info on the upper limit of port size, please read Dan Wiggins white paper on the issue. I read it so long ago, I don't know where to find it...sorry.

For all out SPL, output heavily depends and relies on the port. Maximizing port size, cone area, and power are key.
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Old 03-26-2007, 10:30 AM
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it is something i will read if i can fined it
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Old 03-26-2007, 10:51 AM
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Originally Posted by zzzzzzz
it is something i will read if i can fined it
It's doesn't seem to be on the Adire site anymore. Best bet would be to email Dan Wiggins to ask him for the tech paper. It's a very good read.

But to summarize...please see below.

Originally Posted by DanWiggins
FWIW, I usually shoot for peak velocities around 20-25 m/sec (around 0.05-0.07 mach) when designing for low-loss (high SPL) systems. For more typical applications, I'll allow up to 35 m/sec (around 0.1 mach), if the shortening of the vent length is advantageous (from a sonic standpoint - pipe resonances, leakage, etc).

Dan Wiggins
Adire Audio
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Old 03-26-2007, 11:21 AM
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Not sure if it's the exact same article that gleepoy means, but I found this:
Vent Sizing

You can go back to archives and try another year, maybe you can find something.

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Old 03-26-2007, 11:32 AM
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Originally Posted by df.dima
Not sure if it's the exact same article that gleepoy means, but I found this:
Vent Sizing

You can go back to archives and try another year, maybe you can find something.

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Good job...that's the one!
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