SPL/SQL Interchangable Ports?

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alexv3305

Member - Posts: 3

Joined: March 31, 2006

Location: United States

Posted: March 31, 2006 at 11:16 AM / IP Logged

Ok I figured out how to use WinISD, but someone double check my calculations. Would this work for two Kicker L5 15 inchers in a ported box?

Board thickness = 0.98 in or 1 in

Height = 18 in^3

Width = 41 in^3

Depth = 25.51 in^3

Total Volume = 8.536 ft^3

***Interchangable Ports***

SPL Port

~Tuning Freq = 45hz~

Port Dimensions = (16" x 5") Length = 4.54"

--------------------------------------------------

SQL Port

~Tuning Freq = 30hz~

Port Dimensions = (16" x 5") Length = 19.83"

Just let me know if this would work...

stevdart

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Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: March 31, 2006 at 4:02 PM / IP Logged

Looks like you're on the right track with the tuning freqs you described (although I'm honestly not going to look up that woofer and work all this up!...I didn't even hear a "please"). Be sure you've allowed for the difference in the air volume between those two ports...or are these ports designed on the outside of the box? That might be the ticket for interchangeability.

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

alexv3305

Member - Posts: 3

Joined: March 31, 2006

Location: United States

Posted: March 31, 2006 at 6:34 PM / IP Logged

the box is going to be designed to have interchangable ports so i can compete in spl and go for sql although kickers suck for sq. i jus want to know if it will work good.

......"please"......lol

thanks,

alex

alexv3305

Member - Posts: 3

Joined: March 31, 2006

Location: United States

Posted: March 31, 2006 at 6:35 PM / IP Logged

stevdart wrote:

Be sure you've allowed for the difference in the air volume between those two ports...or are these ports designed on the outside of the box? That might be the ticket for interchangeability.

what do u mean allowed enough room for the difference in air volume between the two ports?

explain please...

boardinbum

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Joined: February 07, 2005

Location: United States

Posted: March 31, 2006 at 7:04 PM / IP Logged

The SPL port looks good. With your SQL port, I would almost tune it even a little lower.

arrow12

Silver - Posts: 527

Joined: October 06, 2005

Location: United States

Posted: March 31, 2006 at 7:46 PM / IP Logged

You are going to have to change the length of the ports. This takes up a different amount of volume in the box. I think this is what stevdart meant, but please correct me if I am wrong stevdart.

That's my opinion. Take it, leave it, or correct me.

stevdart

Platinum - Posts: 5,816

Joined: January 24, 2004

Location: Pennsylvania, United States

Posted: March 31, 2006 at 10:34 PM / IP Logged

You are right on, arrow12. A port structure 16 X 5 X 20 takes up much more displacement from an enclosure than 16 X 5 X 4.5. The box size remains the same but the airspace is different with the two port sizes, so that difference has to be accounted for when figuring tuning freq per air volume, which determines the port length. If the box were designed with a 4.5 inch port designed permanently inside, but with a configuration that allowed an add-on port structure to be mounted, you could make the switch easier. And most importantly, the airspace wouldn't diminish so greatly with the larger port structure inside.

Here's an idea of what I mean:

SPL/SQL Interchangable Ports? - Last Post -- 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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SPL/SQL Interchangable Ports?

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