Dash Speaker Enclosure Design - FloridaSPL


Go Back   FloridaSPL > Knowledge Base > FloridaSPL.com Knowledge Base
Thread Tools Display Modes
Prev Previous Post   Next Post Next

Old 01-03-2009, 08:49 AM   #1
You Like That Don't You?
FloridaSPL Addict
CalusaCustomConcepts's Avatar
Join Date: Feb 2006
Location: Zephyrhills
Posts: 6,646
Send a message via AIM to CalusaCustomConcepts
Default Dash Speaker Enclosure Design

So you've got yourself one of those fancy horseless carriages with the unique distinction of an audiophile’s wet dream; it’s got dash speakers. The problem is, they’re tiny. They could be 3.5, 4, or if you’re lucky….4x6 inches! Whoo hoo! Hold up Custer. Those Little Bighorns in your dash are going to cause you as much trouble as Crazy Horse if you’re not careful.

You see, the larger the cone area on your speakers, the lower the resonant frequency is. Since you’re relying on these preemie babies to cover the transition in the audible range from your lows (which are typically crossed over somewhere between 80 and 100 Hz) to your midrange (if you’re lucky you’ll get a clean response all the way down to 80) then those pitiful electroacoustical transducers in your Model T are going to have their work cut out for them. Since the back waves of the speakers are firing into the cavernous void of airbags, evaporators, and speedo cables they’re essentially running infinite baffle. Baffling I know, but at that rate when the first beat of Marky Mark and the Funky Bunch rips through your quasi-air dielectric bi-wired individually paralleled insulated Litz constructed Speaker cables, your wee drivers are going to hop like Dogfish Head 120 Minute IPA.

What’s the solution you say? Two words: sealed enclosures. I know, I know, the door speakers in your wife’s Fiat X-19 sound great, and that’s not exactly Grant’s catacomb. What gives Buzz? Ok, ok, I’ve got two more words: antiphase radiation. No, it’s not some 1950’s propaganda concept designed to convince you that nuclear fallout is good for your teeth. It’s what’s happening in that mysterious place abaft your dinky diaphragms. Every time you jam your Esteban instructional discs, your speakers are creating sound through the front and back of the cones. If the back waves meet your ears at the same time as the front waves, then most of the sound is cancelled out. (This is why your Funky Pups sound like EVs when you play them out of the box.)

Those door speakers may be playing into a vibrational, diffractional, reflectional, partition, but at least they’re not playing down through the top of your dash and into the listening area like those cramped co-axials under your windscreen. Those back waves are wreaking havoc on your speakers’ ability to reproduce accurate sound, much less down to the critical frequencies that you need to transition out of your subs’ range.

You’re thinking, “You’re asking me to remove my dash and Build a complex fiberglass enclosure behind my speakers? You’re a lunatic!” Well, you may be right. I may be crazy. But it just may be a lunatic you’re looking…..sorry. I got distracted. NO! I’m going to show you what to do:

So you’ve got your high-fidelity factory dash speaker……

Go ahead. Check out your hair in that dust cap…..

Once you remove the speaker, you could find anything in there……

If you find any rodents, food, children, or trash, throw it away. If you find money or beer, send it to FloridaSPL.com here: https://www.floridaspl.com/forums/payments.php

You’re going to need some supplies to get working…..

Most important; beer. After that, you will need some sound deadening sheets like Damplifier, Dynamat, etc., a closed cell foam product like Overkill pro, a knife to cut them with, a surface to cut them on, and some spray adhesive.

You start by placing strips of the sound deadening sheets inside with the goal being to create a bowl or cup shape in the hole.

Keep in mind that your speakers have to fit in the dash when you’re done. So use common sense when building your enclosure. Make sure your speaker’s magnet and terminal connections will fit when you’re done.
Building this enclosure as air-tight as possible is the objective.

I built the bowl shape with lots of strips and then I sealed the top edge with these little rectangles you see here.

If you only have the self adhesive mats, you’re done. Install your speakers and enjoy the sonic benefits. But if you’re going all-out with the closed cell foam, keep reading.
Buzz Thompson

Last edited by CalusaCustomConcepts; 01-03-2009 at 01:30 PM..
CalusaCustomConcepts is offline   Reply With Quote


Quick Reply

Register Now

In order to be able to post messages on the FloridaSPL forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.

If you're using Yahoo, check your spam box for the registration e-mail from FloridaSPL.

Email Address:
Where you live


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
need help with two DD 9515 enclosure design audiowaves1 SPL & SQ 12 01-12-2009 09:20 AM
7" in-dash touchscreen Tview brand new kingss Audio For Sale / Wanted 4 05-20-2008 11:08 PM
Clarion In-Dash 7" Touchscreen DVD Player Big_Dawg Audio For Sale / Wanted 13 08-12-2007 11:28 PM
Power Acoustik In-dash DVD Player KIAKID Audio For Sale / Wanted 9 06-14-2007 06:57 PM
Power Acoustiks In-Dash DVD Player. KIAKID Audio For Sale / Wanted 1 05-24-2007 11:49 AM

All times are GMT -5. The time now is 07:08 PM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.