SPEAKER ENCLOSURE CALCULATOR
                        VERSION 1.0 UNREGISTERED

                        Written by D.A. Harpster

     This little program will calculate a nice sounding enclosure for all
types of dynamic speakers.  The good thing about it is that you don't
need a PhD in acoustics to use it.  Plus, it's cheap.
     All you need to use this program are the specifications for your
speaker.  The specifications you will need are:

Box Resonance:  This is the variable which determines the curve of bass
     response.  Experimenting with numbers between .5 and 1.5 will produce
     normal sized enclosures.  Lower numbers will provide even responses
     throughout all frequencies, but higher numbers will emphasize the
     higher bass frequencies.

Resonance Magnification (Qts):  This is the ability of a speaker to
     reach its maximum sound output level.  A range from .4 to .6 is normal.

Compliance (Vas):  This shows the stiffness of the speaker's suspension.
     It is the volume of air which equals the stiffness of the speaker.
     Most of the time, larger speakers have higher compliances than 
     smaller speakers.

Resonance Frequency:  This is the natural frequency of a speaker when
     operating outside an enclosure.

Diameter of Duct:  This is the inside diameter of the tube which is placed
     in ported enclosures to increase bass efficiency.  This number is only
     used for ported enclosures.

Number of Ducts:  This is simply the number of ducts you desire in your
     ported enclosure.

NOTE:  If the program's results for duct length seem irregular, the 
       speaker may not be suited for a ported enclosure.

     I hope you like this program, however, it is NOT free.  If you find it
useful and would like to register it, you may do so by sending me $10.
In return, I will send you the latest registered version of the program.

     Feel free to copy this program and give it to friends, other Bulletin
Board Systems and Online Services.  Please make sure all of these
files are put into an archive:
SPEAKER.EXE - The actual unregistered program
SPEAKER.TXT - This file you are reading
SPEAKER.ICO - The Windows icon for the program

Your comments on this program are welcome.  Thanks for reading this document!

Douglas Harpster
Route 1  Box 83
Ewing, NE  68735-9505

E-Mail:  DHarpster@aol.com
CompuServe ID:  74652,1052
Fax: (402) 485-2803