Date:         Tue, 3 Jun 2008 09:34:19 -0700
Reply-To:     David Kao <dtkao0205@YAHOO.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Kao <dtkao0205@YAHOO.COM>
Subject:      Re: a speaker recommendation
In-Reply-To:  <48446bb5.1bf0220a.160f.37e4@mx.google.com>
Content-Type: text/plain; charset=iso-8859-1

An enclosure in the back of a sub is required for it to work properly.
It eliminates the wave radiated toward the back of the sub to interfere
the wave radiated forward. The size of the enclosure will affect the sub's
resonant frequency. When it's too small it raises the resonant frequency.
The best resonant frequency of a sub is around 40 - 45 hz (unless I remember
it wrong). Normally it will require a very large enclosure to bring the
res. frequency down. Most subs use air suspended cone so that the enclosure
needed is substantially smaller. But it will need to be fully air tight, no
leak.  You can buy a small sub and mount it under the driver seat. But
the enclosure there will be too small and not air tight. It most likely
will not work well.

David



--- taeke <taeke.t@GMAIL.COM> wrote:

> The smaller the space the less efficient th subwoofer.  Regardless if its 12 in or 6 in driver.
>
> -----Original Message-----
> From: "Monsieur Lafaire aka obeechi" <obeechi@RUNBOX.COM>
> To: vanagon@GERRY.VANAGON.COM
> Sent: 6/2/2008 2:23 PM
> Subject: Re: a speaker recommendation
>
> Oh, so you need 1/2 cubic foot of air around or under the 10 inch woofers. For what it's worth,
> my battery isn't under the front seats (unless I put small deep cycles there). So maybe I'll
> have to put the bass in the hatch inside movable boxes... or maybe mount them in boxes installed
> just to the side of the engine lid.
>
> ----- Start Original Message -----
> Sent: Sun, 1 Jun 2008 15:12:47 -0700
> From: "Jake de Villiers" <crescentbeachguitar@gmail.com>
> To: "Monsieur Lafaire aka obeechi" <obeechi@runbox.com>
> Subject: Re: a speaker recommendation
>
> >
> > I don't think there's enough air volume under the seats to support a 10"
> speaker.  Maybe a 7" driver?  Would there be 1/2 a cubic foot of air
> volume inside the 3/4 " MDF box?
>
> I'd have to get out the book.   :)
>
> On Sun, Jun 1, 2008 at 2:57 AM, Monsieur Lafaire aka obeechi <obeechi@runbox.com>
> wrote:
>
>   Has anyone put 10 inch subwoofers under the front seats?
>
>   From: Steven Johnson <sjohnso2000@YAHOO.COM>
>
> [truncated by sender]