What does the size of a port mean?!

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rmjjensen

Member - Posts: 7

Joined: April 23, 2002

Location: United States

Posted: January 10, 2003 at 2:03 PM / IP Logged

Ok. I just finished building my dual bandpass box for my car. It's ported through my rear deck and allows for no bass to enter the trunk area so I get no rattle.

When I started this I was slightly scared because I do know some basics of subwoofer designs. I've built a handfull or sealed boxes and this was my first box that used ports. Well, the sound I'm achieving from my box is a real deep, rumbling bass. And I hate it. I was wondering what I can with the port in the box? Basically:

A large port will create deep bass, while a small one punches? What's the difference.

Thanks! (And I'm running 2 Audiobahn Alum 12Q each in their own bandpass box, with a JBL BP1200.1 Amp)

1999 Infiniti G20:

Kenwood DPX-5010

4 JBL GT-1081 Subs

wvsquirrel

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Joined: July 27, 2002

Location: Florida, United States

Posted: January 10, 2003 at 9:19 PM / IP Logged

Most subs will have a recommended port size associated with them (specs from the factory) for the best sound. You can "tune" the ports by increasing or decreasing the port length and width until the desired sound/frequency is achieved. Most ports have a heavy cardboard tube attached to them for tuning the length.

Squirrel

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rmjjensen

Member - Posts: 7

Joined: April 23, 2002

Location: United States

Posted: January 11, 2003 at 8:51 AM / IP Logged

yeah I might just have to play with it. I can't get anything from www.audiobahninc.com. All they have is subwoofer specifications. They get pretty advanced though where I can plug them into a program, along with my box, and I should get a requency response graph. This is what a want to do. Is there a program out there that I can download and try it out? Thanks!

1999 Infiniti G20:

Kenwood DPX-5010

4 JBL GT-1081 Subs

CharlzO

Member - Posts: 45

Joined: June 02, 2002

Location: United States

Posted: January 18, 2003 at 8:58 PM / IP Logged

One thing you might not have seen yet, is that the ALUM's aren't designed to run in a ported box. They recommend about a 1 Cubic foot, sealed box, with I think 20" fill (insulation in the box) for best sound. I ran a pair of them at one point in my Avenger, and tried a pair of 4" ports, one per chamber in the box. To be honest, sounded horrible. I sealed them back up from inside the box with some spare blocks and a heavy epoxy, and it sounded a jillion times better again. Just words of my experience.

Derrik

Member - Posts: 46

Joined: November 02, 2002

Location: United States

Posted: January 19, 2003 at 12:22 AM / IP Logged

here's some help for you. you got to get the tuned frequency right for the box in order for it to sound good.

http://www.jlaudio.com/tutorials/ports/index.html

rmjjensen

Member - Posts: 7

Joined: April 23, 2002

Location: United States

Posted: January 19, 2003 at 8:28 AM / IP Logged

CharlzO -> Yeah I might just go with a nice sealed box ...it would take up far less room and I think would have an overall better sounding.

Derrik -> That JL site is awesome! Thanks a lot!!

1999 Infiniti G20:

Kenwood DPX-5010

4 JBL GT-1081 Subs

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What does the size of a port mean?!

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