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137.4 dB, what subs hit harder?


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Flakman 
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Posted: September 27, 2006 at 10:38 AM / IP Logged  
lukeyn wrote:

I am wondering if there needs to be a certain clearence distance between the rear of the port and the box ?

With a tube port, you want 3" of clearance all the way around the end of the port inside the box.

The Flakman
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John | Manteca, CA
the12volt 
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Posted: September 27, 2006 at 10:43 AM / IP Logged  
Flakman wrote:
lukeyn wrote:
I am wondering if there needs to be a certain clearence distance between the rear of the port and the box ?

With a tube port, you want 3" of clearance all the way around the end of the port inside the box.

This is only true if the diameter of the port is 3" or smaller. The rule of thumb for distance/clearance from the end of the port is the same or greater than the diameter of the port.

137.4 dB, what subs hit harder? - Page 5 - Last Post -- posted image. the12volt • Support the12volt.com
Flakman 
Copper - Posts: 365
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Posted: September 27, 2006 at 10:56 AM / IP Logged  

Thanks, 12volt. I stand corrected...or sit as the case may be. 137.4 dB, what subs hit harder? - Page 5 - Last Post -- posted image.

I will adjust my answer.

For the port you are using, 3" of clearance all the way around the end of the port inside the box is what you need.

The Flakman
I feel strange. I have deja vu and amnesia at the same time.
John | Manteca, CA
lukeyn 
Member - Posts: 47
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Posted: September 28, 2006 at 4:45 PM / IP Logged  

what are the negative effects of not having this clearence ???

haemphyst 
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Posted: September 28, 2006 at 4:49 PM / IP Logged  
It will be the same as having too small a port, but too long... this will shift the tuning frequency, and could (just like ANY mis-tuned vented enclosure) cause damage to your woofer, if the mismatch is severe enough.
It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."
lukeyn 
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Posted: September 29, 2006 at 3:55 PM / IP Logged  

thanks

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