improving my subwoofer enclosure

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jmalbright

Member - Posts: 47

Joined: February 10, 2008

Location: Texas, United States

Posted: April 25, 2008 at 7:46 AM / IP Logged

stevdart wrote:

40 inch long port at 5 or 6 inches diameter?? Ewwww...that's a lot of port. Should that box have been better sealed instead? Did I look at this (sounds almost familiar, in an almost familiar kind of way)?

My EBP was right around 60 so I probably could have gone sealed. However, the manufacturer recommends a vented enclosure for the subwoofer I had. Also, I have had all sealed subs in the past and I was looking for a little more output than what sealed offered, so I really want to go vented.

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jmalbright

Member - Posts: 47

Joined: February 10, 2008

Location: Texas, United States

Posted: April 25, 2008 at 7:50 AM / IP Logged

DYohn wrote:

1. In general, no, although subwoofers tend to be more predictable with the port opening on the same baffle as the driver.

2. PVC pipe is what I usually use.

Excellent.

A couple more port related questions:

1) What exactly is the "end correction" on WinIsd?

2) Considering that my subwoofer will be in my trunk, is the port velocity that critical as long as I keep it within reasonable values?

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DYohn

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Joined: April 22, 2003

Location: Arizona, United States

Posted: April 25, 2008 at 9:17 AM / IP Logged

I like using numbers. Makes it so easy to ask and answer questions!

1) End correction is so the program can take into account the effects of the entrance and/or exit of your port being flush, flared, etc.

2) Not nearly as critical, no. Also, if the high velocity frequency is very low (like ~24Hz or lower) you generally won't hear it anyway.

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stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: April 25, 2008 at 8:45 PM / IP Logged

re: end correction in WinISD Pro:

Look for this diagram and the accompanying information in the Help files.

improving my subwoofer enclosure - Page 3 -- posted image.

Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.

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improving my subwoofer enclosure

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