On 31 Oct 2005 20:47:41 -0800, "
wrote:
I'm studying industrial design at Wentworth Institute of Technology
in Boston. I have been given the following assignment: to design a
speaker enclosure to house a 4" woofer and a 2" diameter tweeter.
The tweeter is an Onkyo 3/8" (269-708) standard one-way driver.
The driver parameters are as follows:
Fs=4200 Hz
P-diameter = 0.375"
Sd=0.713sq.cm
Re=3.5 Ohms
Le-= 0.013Mh
Z=4 Ohms
Pe=20 watts
no=0.306%
1-W SPL=87dB
2.83-V SPL=90.59dB.
Woofer properties:
Goldwood, GS204/4S (290-370) standard one-way driver.
Driver parameters:
Fs = 138 Hz
Qms = 7.19
Vas= 0.991 Liters
Cms= 0.336 mm/N
Mms= 3.964 g
Rms= 0.478 kg/s
Xmax= 1.5mm
Xmech= 2.25mm
P-dia= 3in
Sd= 45.6 sq.cm
P-Vd= 0.00684 Liters
Qes= 2.2
Re= 3.333 Ohms
Le= 0.184 mH
Z= 4 ohms
BL= 2.282 N/A
Pe= 40 watts
Qts= 1.69
No= 0.114%
1-W SPL = 82.72 dB
2.83-V Spl = 86 dB
Box parameters:
Type" Closed Box
Vb= 4.248 Liters
QL=20
Fill = Heavy
My assignment is to design two bookshelf / desktop speakers that not
only produce quality sound but are visually appealing. Our professor
suggests we use ½" or ¾" MDF fiber board because it is dense and
good for sound applications. We are allowed to explore other materials
if we desire. This assignment is pretty open as far as materials and
box design. I'm not asking for someone to do all the work for me
with this assignment but rather provide me with some tips or possible
places I can find some information about speaker boxes. Anything you
can provide me would be most appreciated. Thanks!
Jesse Stein
If this is not the correct newsgroup to post this to if someone could
direct me to a more appropriate group I would really appreciate it.
Try the following links.
http://www.speakermania.com/
http://www.madisound.com/cgi-bin/discuss.cgi?
http://www.diysubwoofers.org/talkshop/
http://f16.parsimony.net/forum27133/index.htm
http://www.pesupport.com/cgi-bin/config.pl
http://www.spiceisle.com/audiodiy/
http://www.diyaudio.com/
http://www.speakerbuilding.com/
http://www.us-epanorama.net/audiospeakers.html
http://www.hi-fi.com/speaker/
http://www.sound.au.com/tsp.htm
http://www.geocities.com/SiliconVall...peakernet.html
http://www.melhuish.org/audio/links.htm
http://www.scrounge.org/speak/speak.htm
http://www.globalnode.com/users/stevenr/xover3.htm
http://www.audioasylum.com/audio/speakers/bbs.html
http://members.tripod.com/XSSpl/Audio/Sound.htm
http://www.speakerworks.net/
http://www.madisound.com/
http://www.speakercity.com/
http://www.epanorama.net/measuring.html
http://www.epanorama.net/measuring.html#audio
http://www.trueaudio.com/linksp1.htm
http://www.audioholics.com/Message_Forums.htm
http://www.i-depth.com:80/P/k/kj0501...speakmess.html
http://www.AudioAsylum.com/audio/speakers/bbs.html
Some of these links are old but their should be something there
that'll get you started.
I've used a program called win ISD to calculate box volumes and dimns
that is fairly accurate and is free to be had at their site.
www.linearteam.org/winisd.html
There are better programs but this one gets the job done.
If your going with a woofer as small as 4 inchs 1/2 inch mdf will do
though I always use 3/4 or thicker for my projects.
The key thing for getting good sound out of such a small driver is to
be sure to limit the low pass frequencies to keep response tight.( I
wouldn't try and drive anything below 40hz into it, it would most
likely cause distortion and will certainly rob it of most of it's
efficiency.)
Keep the design simple, go with a sealed box, you really won't see
much benefit from porting with such a small driver.( You might
consider a dual woofer setup wired out of phase if you can get two
more of those Goldwood's.(It's called an isobarik or push/pull design
and works wonders when used with smaller drivers. Most designs use a
simple tube configuration which can be designed for an esthetically
pleasing appearance.)
Here are a couple of up-to-date links for software.
http://melhuish.org/audio/software.html
http://www.audiogrid.com/audio/