l7 15 ported enclosure

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bman365

Member - Posts: 9

Joined: October 26, 2007

Location: North Carolina, United States

Posted: January 17, 2008 at 6:06 PM / IP Logged

I haven't stretched the fabric yet, so I don't know how much air space I will have but I'm shooting for around 4-4.5 ft^3 for one L7. So with a 4 ft^3 box, how big should the port be to tune it to 33hz. I want the width of the port opening to be 14.75 in.

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bman365

Member - Posts: 9

Joined: October 26, 2007

Location: North Carolina, United States

Posted: January 17, 2008 at 6:09 PM / IP Logged

Forgot to add that I want it to be a rectangle type port.

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jmelton86

Gold - Posts: 1,228

Joined: February 07, 2007

Location: South Carolina, United States

Posted: January 17, 2008 at 6:16 PM / IP Logged

https://www.the12volt.com/caraudio/boxcalcs.asp#por

2013 Kia Rio -90a alternator

DDX470HD GTO14001 GTO1014D (x3)

Big3 in 1/0G

1/0G to GTO14001

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bman365

Member - Posts: 9

Joined: October 26, 2007

Location: North Carolina, United States

Posted: January 17, 2008 at 7:19 PM / IP Logged

thats for round ports only..

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bman365

Member - Posts: 9

Joined: October 26, 2007

Location: North Carolina, United States

Posted: January 18, 2008 at 1:26 PM / IP Logged

What causes port noise? Too thin of a opening? I want my opening around 3.5"x14.75"..I wont get port noise with that will i

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jmelton86

Gold - Posts: 1,228

Joined: February 07, 2007

Location: South Carolina, United States

Posted: January 21, 2008 at 6:59 PM / IP Logged

From what I understand, too small of ports have bad noise. This is why you see huge ports often. Maybe someone can reiterate.

Do a search on the subject an you'll find calculators for round/square port conversion.

2013 Kia Rio -90a alternator

DDX470HD GTO14001 GTO1014D (x3)

Big3 in 1/0G

1/0G to GTO14001

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ice32

Copper - Posts: 116

Joined: June 12, 2007

Location: Australia

Posted: January 21, 2008 at 9:14 PM / IP Logged

Circle port length to slot port calc

use that in combination with the link that jmelton gave you and you should get the tuning freq u want for a square/rectangle port

I'm not sure but from what I've read apparently port noise is from lack of port area

P.s

This might be a bit more of what you want.

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l7 15 ported enclosure

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