[sdiy] semi ot: loud speaker for synths

[Don Tillman]

   > Date: Tue, 25 Nov 2003 12:17:08 +0100
   > From: "Czech Martin" <Martin.Czech at micronas.com>
   > 
   >  I do not believe into this "sub bas has no direction"
   >  nonsense. The intensity on the ear towards the speaker is always
   >  higher then on the other ear, the closer you are the more
   >  pronounced.

The wavelength of the low E on a bass guitar (42 Hz) is 26 feet.   
Your ears are about 6 inches apart.

Direction doesn't really mean much at that scale.

   >  Also, correlation has to be watched for a single subwoofer,
   >  otherwise it might cancel in the summing amp already

Whenever you have multiple speakers you get cancelling effects.  It's
expected and accepted.  For instance, if you play a 500Hz mono sine
wave into both speakers of a stereo pair and then walk around the room
you'll hear nodes every foot or so.  Nobody complains about that.

   > -I can not see what the membrane diameter has to do with the
   >  useable displacement. (This is not the maximum displ.).  But I
   >  can see that a large membrane (remember the 80cm Fostex
   >  chassis?) has problems with stability and partial
   >  resonances. Given that the coils, magnets and crimping have the
   >  same quality, a 4*10 can work better as a 1x18, because the
   >  seperate membranes are better controlled

Sure.  Yet the 1x18 will probably have far better characteristics with
respect to enclosure size, efficiency, weight, low end response, etc.
(Otherwise larger speakers wouldn't sell.)

  -- Don

-- 
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com