Downfiring formula, is this correct?

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luckydevil

Silver - Posts: 365

Joined: July 04, 2005

Location: United States

Posted: July 31, 2006 at 7:38 PM / IP Logged

I'm using the formulas here to calculate the "Percentage of Sag."

I'm doing the calculations for an Oz Me12.4 (Fs 34Hz, Xmax 25mm).

PS = 24,849 / (25*1156)

= 24,849 / 28,900

= .86

Now it says... "As a general rule of thumb, any time the sag exceeds 5% of the driver's Xmax, it's not recommended for a down-firing subwoofer application."

Now am I correct in thinking that the PS should be .95 (95%) or more (closer to 100%) for the driver to be properly used in a downfiring configuration?

That last part on the Parts Express page was kind of vague.

Thanks guys.

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austincustoms

Copper - Posts: 232

Joined: November 15, 2005

Location: United States

Posted: July 31, 2006 at 7:57 PM / IP Logged

I don't get that formula, but what subs are you trying to use?

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: July 31, 2006 at 11:06 PM / IP Logged

Using that formula gets you the % sag in real numbers. Your woofer is 0.86%, so it is a perfect candidate for up or down mounting.

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luckydevil

Silver - Posts: 365

Joined: July 04, 2005

Location: United States

Posted: August 01, 2006 at 12:04 AM / IP Logged

Good stuff. Thanks DYohn!

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Downfiring formula, is this correct?

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