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ported box for boat and size restraints


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advanex 
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Joined: April 08, 2012
Location: Tennessee, United States
Posted: April 24, 2012 at 1:15 PM / IP Logged  
My friend has a boat, and in one compartment, he has a 12" Alpine Type R in a sealed box (with many leaks and too small!)
I want to build him a ported box, but I have one issue.
The opening is 10" wide and 18" tall. I could probably fit 2' 6" to 3' long box through the opening. He wants SPL, so from what I read, ported is the way to go. Alpine recommends 1.7 cubic feet in a ported box.
Do I have enough room for a 1.7 cubic foot ported box? Can anyone show me a design that would fit this purpose?
Keep in mind that he opens the door to this opening when he plays music. This is the compartment behind the steering wheel.
I can get pictures if it will help.
Thank you.
advanex 
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Joined: April 08, 2012
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Posted: April 24, 2012 at 3:55 PM / IP Logged  
Here is a picture of the area I'm asking about. The red arrow is the door opening that I'm trying to get this box into. Under the dash area is pretty open and spacious behind that little door.
ported box for boat and size restraints - Last Post -- posted image.
DYohn 
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Joined: April 22, 2003
Location: Arizona, United States
Posted: April 24, 2012 at 7:07 PM / IP Logged  
How deep is the woofer?  If your enclosure is 9.5" deep and 17.5" tall, if you can make it 26" wide, using 3/4" marine plywood you'll end up with 1.8 cuft gross volume.  Add the driver and a couple simple cross braces and you're right at 1.7 cuft.  But will your woofer fit into something that's only 9.5" deep with 3/4" walls?
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advanex 
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Joined: April 08, 2012
Location: Tennessee, United States
Posted: April 24, 2012 at 7:36 PM / IP Logged  
Alpine specs say that the mounting depth is 6.375". How would I create the port and to what size?
advanex 
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Joined: April 08, 2012
Location: Tennessee, United States
Posted: April 24, 2012 at 8:09 PM / IP Logged  
http://support.alpine-usa.com/products/documents/OM_SWR_S06212011.pdf
Here's the spec sheet for the Alpine Type R sub. It may help determine what frequency and port size I need. Keep in mind that I'm still learning about ported enclosures and tuning them. I'm willing to read and learn.
I've built a Digital Designs box for my own ride, but it had all the dimensions already there.
I'm not sure how to calculate the proper port size once a box has been modified or re-created.
advanex 
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Joined: April 08, 2012
Location: Tennessee, United States
Posted: May 13, 2012 at 9:05 AM / IP Logged  
Well, I finished building it. He's amazed at how it sounds. Here's a couple of pics of it. It was a super tight fit in the boat, but it fit.
ported box for boat and size restraints - Last Post -- posted image.
advanex 
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Joined: April 08, 2012
Location: Tennessee, United States
Posted: May 14, 2012 at 5:01 PM / IP Logged  
Here's a pic of it in the boat. Sorry for the crappy quality.
ported box for boat and size restraints - Last Post -- posted image.

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