woofer too big, or trunk too small?

Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=94734
Printed Date: May 19, 2024 at 3:19 AM

Topic: woofer too big, or trunk too small?

Posted By: pendulum
Subject: woofer too big, or trunk too small?
Date Posted: June 12, 2007 at 10:05 PM

Well, the answer's simple. My trunk's too small for my new Lighting S4.15.VC2. How would I go about designing a box to run this woofer inverted? I tried to just delete all physical dimensions from the woofer in WinISD to trick it into not calculating the woofers displacement but that resulted in some craziness. So, am I hosed or can I design a box to fit and still sound good?

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1999 Toyota Camry
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Pioneer DEH-P3700MP
Lightning Audio Strike S4.15.VC2
Lightning Audio Strike S4.500.1
Majestic 6.5"

Replies:

Posted By: speakermakers
Date Posted: June 13, 2007 at 12:21 AM

I am missing what the main problem is. Are you trying to build a box that will fit in your trunk?

Posted By: haemphyst
Date Posted: June 13, 2007 at 12:26 AM

Build the box to the same volume that the software tells you to, then simply glue or screw a (few) block(s) of wood to the wall, equivalent to the woofer's displacement. Done and done.

You're making it harder than you have to! posted_image

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Posted By: stevdart
Date Posted: June 14, 2007 at 5:57 AM

WinISD does NOT calculate driver displacement, even if you fill in the driver dimensions. This from the HELP FAQ file:

Q. Does WinISD add brace/driver/port displacements to calculated box volume?
No. WinISD doesn't do guessing, and therefore shows net volume for your box. It would be hard to predict, how you are going to mount your driver. Or the port. Or how much and which kind of bracing you are going to use inside your box. For example, you could mount port completely external to the box, which case "usual" guess would be completely wrong. Bottom line is, that you must calculate and add any displacements by yourself to calculated box volume.

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Build the box so that it performs well in the worst case scenario and, in return, it will reward you at all times.