There's also the Yahoo group Quarter-Wave
(http://tech.groups.yahoo.com/group/quarter-wave/), where there is
discussion of loudspeaker design, and the related website Quarter
Wavelength Loudspeaker Design (http://www.quarter-wave.com/) where there
is Mathcad software for loudspeaker design. Mostly for transmission-line
designs. Seems to be good; but I haven't built any yet myself.

Gerard Lardner


On 09/05/2011 07:12, Bo-Erik Sandholm wrote:
>
>  A bit out of topic but if anyone else is into building their own speaker 
> cabinets.
> Let me point you to a document that is very good in explaining the design 
> choices in a cabinet for the bass frequencies.
>
> http://www.sonicdesign.se/optimum.html
>
> Regards
> Bo-Erik 
>
> -----Original Message-----
>> From: sursound-boun...@music.vt.edu [mailto:sursound-boun...@music.vt.edu] 
>> On Behalf Of Bo-Erik Sandholm
> Sent: den 4 maj 2011 13:48
> To: Surround Sound discussion group
> Subject: Re: [Sursound] Minim AD7 for sale - Speaker configs.
>
> >From 
>> http://en.wikipedia.org/wiki/Sound_localization#Evaluation_for_low_freq
>> uencies
> Evaluation for low frequencies
>
> For frequencies below 800 Hz, the dimensions of the head (ear distance 21.5 
> cm, corresponding to an interaural time delay of 625 µs), are smaller than 
> the half wavelength of the sound waves. So the auditory system can determine 
> phase delays between both ears without confusion. Interaural level 
> differences are very low in this frequency range, especially below about 200 
> Hz, so a precise evaluation of the input direction is nearly impossible on 
> the basis of level differences alone. As the frequency drops below 80 Hz it 
> becomes difficult or impossible to use either time difference or level 
> difference to determine a sound's lateral source, because the phase 
> difference between the ears becomes too small for a directional evaluation.
>
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