Extend Aeroport?

[solidcrowd 10+ year member]

My enclosure is tuned to 32hz right now. It's a 2.5cuft enclosure after sub and port displacement. I would like to try and tune to 28hz to see how low my Mag can get.

I cannot extend the port because it will hit the back wall. The enclosure depth is 15 and my port is 11" long (4" flared). I was wondering if I can build a MDF ring/baffle (like they do for door speakers) that would allow me to mount the port on and increase the space between the wall and end of port. Will the port's displacement be affected or enclosure volume?

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[bhsdriller 10+ year member]

If you're just testing extend the port on the outside of the box, keep the port length the same on the inside. Won't change anything on the inside and you can make it as long as you want (within reason)

 

[solidcrowd 10+ year member]

Well the port's already cut to 11in. I would have to order another one from parts express. That's why I'm making sure this MDF ring idea will work before I spend $20 on another port.

ex. So If I build a 1" baffle and make the port 12" long instead of 11" long...Will I get a lower tunning?

 

[bubbagumper6 5,000+ posts]

Well the port's already cut to 11in. I would have to order another one from parts express. That's why I'm making sure this MDF ring idea will work before I spend $20 on another port.
ex. So If I build a 1" baffle and make the port 12" long instead of 11" long...Will I get a lower tunning?

Is it flared on the outside? The only problem I'm seeing is your going to have two flares face to face so the port will have a larger diameter at that point...could have some weird effects.

 

[solidcrowd 10+ year member]

Both ends are flared. The port as of now is attached to the box. Basically All I will be doing making a double baffle (if you will) for the port, instead of the whole front piece.

 

[Bumpin' Goalie 10+ year member]

If you replace the 11" with a 12", it'll lower tuning. And your baffle idea could work. It would also not affect the port displacement since the baffle would be exterior.

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[solidcrowd 10+ year member]

to get 29hz. I'll have to change it from 11" to 14" So new topic....would a 5" baffle look stupid lol

 

[solidcrowd 10+ year member]

and is there a big difference from 29hz to 32hz. I know going from 32hz to 37hz sounded like sh*t lol

 

[bubbagumper6 5,000+ posts]

You still didn't address my concern...your port is going to be flared going in, then it's going to flare out then flare back in at your joint, then finally flare out inside the box. Fairly sure that's cause for concern, you want the port to be uniform diameter internally then flared only at the ends...

 

[solidcrowd 10+ year member]

I'm not sure I know what you mean. I have this port

The flared part in the back is a smaller flare than the front flare. The front flare has 4 screw holes which attach it to the opening, like a terminal cup. The MDF ring I'm planning on making is going to be the same diameter as the existing hole in the box now, just raised. Sorry if I don't understand

 

[Phoenix Risen 10+ year member]

your thinking is a little off bubba, he is wanting to run 1 port, not joints in it other than the ones at the flares and tubes, he is just wanting to move the mount for the port 1-5 inches off of the front of the box with a solid baffle,

and you will notice a difference in a drop from 32 to 29 will it be insane probably not, but it could be worth trying, if it turns out to not be worth it you could aways change it back