From: "Bruno L. Albrecht" <brunolalb@gmail.com>
To: Microcontroller discussion list - Public. <piclist@mit.edu>
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Date: Fri, 20 Mar 2020 02:26:20 -0700
Subject: Re: [OT]: Optimal speaker enclosures.
Thread-Topic: [OT]: Optimal speaker enclosures.
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Have you checked DML speakers? I built a pair for myself, powered by an
Aliexpress Class D amplifier and they're simply impressive.
https://www.youtube.com/watch?v=3DzdkyGDqU7xA

Use the stiffest Styropor you can get your hands on

On Thu, 19 Mar 2020 at 23:45, Bob Blick <bobblick@outlook.com> wrote:

> Hi Justin,
>
> I'm not an expert on loudspeakers, but I do have some experience with
> different kinds of cabinets. You are describing an infinite baffle cabine=
t.
> Another type of cabinet that has total isolation from front to rear is a
> sealed cabinet, also called acoustic suspension.
>
> There are lots of different types of cabinets. Another popular type is a
> bass-reflex cabinet, which is ported.
>
> Depending on your speaker's characteristics, it will work better or worse
> in different types of cabinets. The three most important parameters are
> fs(resonant frequency), Qts(the "Q" of the speaker), and Vas(a measure of
> compliance). Generally speaking, infinite baffle enclosures need a low-Qt=
s
> speaker.
>
> Those three parameters are part of what are generally referred to as
> Thiele-Small parameters. Thiele says that if you are making a ported
> cabinet, and your speaker has a Qts of .38, you would make the volume of
> the cabinet the same as Vas, and tune the port to fs. If your speaker has=
 a
> higher Qts you make the enclosure bigger, if Qts is smaller, make the
> cabinet smaller. Thankfully there is software for figuring this out.
>
> BTW, another popular thing people are doing in vehicles these days is
> called "aperiodic membrane". It does require a low to medium Qts speaker
> and more power, but it delivers good fidelity.
>
> Cheerful regards, Bob
>
> ________________________________________
> From: piclist-bounces@mit.edu <piclist-bounces@mit.edu> on behalf of
> Justin Richards <justin.richards@gmail.com>
> Sent: Thursday, March 19, 2020 2:52 PM
> To: Microcontroller discussion list - Public.
> Subject: [OT]: Optimal speaker enclosures.
>
> Noticing there is a resident expert I have a question I have often
> pondered-
>
> Would the optimum theoretical enclosure be a speaker mounted in a wall wi=
th
> infinite dimension such that the front of the speaker can not see the rea=
r.
>
> 1. Optimum as in fidelity and not efficiency.
> 2. "See" as in the sound from the front can not travel to the rear.
> 3. A wall of infinite dimension looking like an infinit xy plane .
>
> I have concluded that an infinte xy plane would be optimal after installi=
ng
> speakers in the rear wall of a ute with little care or funding at the tim=
e
> and discover I was blown away by the performance.
>
> Since that time I have tried installs in sedans with more money and care
> and always disappointed.
>
> Cheers Justin
> --
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>


--=20
  Eng. Bruno Landau Albrecht
  e-mail/G-Talk: brunolalb@gmail.com
  http://hardwaresw.blogspot.com.br/
--=20
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