dual 10 with solo 15 box design

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Forum Name: Fiberglass, Fabrication, and Interiors
Forum Discription: Fiberglass Kick Panels, Subwoofer Enclosures, Plexiglas, Fabrics, Materials, Finishes, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=130540
Printed Date: May 03, 2025 at 1:15 AM

Topic: dual 10 with solo 15 box design

Posted By: fishku7
Subject: dual 10 with solo 15 box design
Date Posted: February 07, 2012 at 10:36 AM

I wanted to get an opinion on how I should go about putting two 10" Boston Acoustic G1's and a single 15" Selenium Tornado into my 2000 Oldsmobile Alero. I have looked all over to even find a picture of someone who has done this but haven't found anything. I planned to seal the 15" and port the 10"s. Trunk space was limited before I acquired the 15" sub with two 10" in a ported box. Now I was hoping to build a box to house all three subs plus mount three amplifiers (400W-cab speakers, 1000W-two 10", and a 2500W-one 15") without sacrificing the entire trunk.
I know this will pull too much power so I'm already planning on getting a new alternator, a second battery, and miles of cable.
This seems like a bigger job even though I have built three boxes of my own. Attached is the CATIA model I made for reference.
Any tips or "DON'T DO THAT!'s" are appreciated, thanks.
posted_image

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Le Fish

Replies:

Posted By: DYohn
Date Posted: February 07, 2012 at 5:49 PM

What are your planned crossover frequencies and what port tuning are you using?

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Posted By: jmelton86
Date Posted: February 08, 2012 at 10:09 AM

Don't do that!

LoL

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2013 Kia Rio -90a alternator
DDX470HD GTO14001 GTO1014D (x3)
Big3 in 1/0G
1/0G to GTO14001

Posted By: fishku7
Date Posted: February 09, 2012 at 8:38 AM

The ports are each 3" in diameter and 12" long. That should give me a tuning frequency of 25-30Hz if I'm not mistaken (sub rated for 24-350). Should I shorten up that port to cover a frequency of 100-200Hz and cut down the box volume? And I want the 10" subs to deliver the higher end bass and the 15" to cover the low end bass. The problem that I currently have with the high end bass is that it creates an annoying vibration and buzz in my car and I have been too cheap to dynomat.

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Le Fish

Posted By: mclovin2012
Date Posted: February 09, 2012 at 10:57 PM

Gotta be very careful with subs in different sizes like that. May run into cancellation problems. I would think it'd be an even bigger problem if you're porting. Frequencies will be too close together. With 8s it might not be as bad, but the math is too much for my brain at midnight...

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Mike

Posted By: fishku7
Date Posted: February 15, 2012 at 7:59 AM

A new idea that came from a friend.

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Le Fish