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1987-10-05
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104 lines
*******************************
** LOUDSP.EXE Ver 2.06 **
** (C) 1987 C. R. Hoffman **
*******************************
WELCOME TO THE LOUDSPEAKER DESIGN DISK! This program has been developed
from various sources, including Speaker Builder Magazine, The Loudspeaker
Design Cookbook, and Weem's How To Design, Build And Test Complete Speaker
Systems. Obtaining any or all of them is highly suggested to increase your
understanding of the many interactions that occur in speaker design.
Here are some suggestions to help you on your way:
1. Always run impedance curves of the drivers. If they are not flat,
(they never are!) then consider using simple networks to flatten
them. This should usually be done with the woofer in a two way
system, and with both the woofer and midrange in a three way system.
Often a midrange will require two networks. The first will cancel
out the rise in impedance due to the inductance of the voice coil.
The second will cancel out the resonant peak at the low end.
REMEMBER: THE CROSSOVER WILL ONLY WORK PROPERLY IF THE SPEAKERS
IMPEDANCE IS FLAT AROUND THE CROSSOVER FREQUENCY.
2. Considering the above, it is usually wise to build a two way system
if it can do the job, as the three way design is quite complicated
if it is done right.
3. The traditional crossover formulas do not work! They yield highly
unpredictable results, which must then corrected by trial and error
until the system sounds right. Use the crossover designs from
the Loudspeaker Design Cookbook, or from the 1985 issues of
Speaker Builder Magazine. The second order Linkwitz/Riley designs
seem to produce the best results for the least complexity.
4. The cabinet design program is LOUDSP. It is provided as a Turbo
Basic (Borland) .EXE file. The use of the program is fairly
obvious, and it will support the 8087 coprocesser if one is
present. Error trapping is provided. Always remember that data
files are stored on the default disk. Whatever is current in the
program is what is stored. IT ALWAYS REMEMBERS THE LAST DESIGN
PARAMETERS ENTERED IN EACH SECTION AND CARRIES THEM TO THE NEXT!!
(This is true of the major design sections only, not port design.)
Section #1 of the main menu requires the use of test equipment to
measure driver parameters. If you do not have the background or
equipment, you may be able to find a local technician to perform
the measurements.
5. Remember to load GRAPHICS.COM from your DOS disk before running
LOUDSP.EXE if you intend to print graphs on an IBM compatible
printer. Use the SHIFT/PrtSc keys. If your system seems to have
trouble running the program, it may be that the program is
confused about whether an 8087 is present. Check your switch
settings, and possibly add one of these lines to your autoexec
file: SET 87=T or SET 87=F depending on the case. If you
have a Hercules or compatable graphic adaptor, use the program
HGCIBM. Please comply with its startup message. The program is
quite well error trapped, and immune to most input errors. Note
that one .DRI file must be present on the default disk for any
read or write operation to occur. If necessary, add a dummy file
if you remove all the .DRI files.
6. The usual procedure to follow is this:
a. Decide what type and size of system to build.
b. Experiment with LOUDSP and the included driver files.
c. If you wish to use different drivers, obtain parameters.
d. Run LOUDSP again for the final drivers.
e. Design box and, if necessary, the port.
f. Select a suitable tweeter.
g. Design crossover.
h. Build the system.
Often you may find a driver you like, and simply design the best
enclosure for it. LOUDSP is easist to use if you have driver
parameters available. Several driver files are included on the
disk to start you out. It is NOT advised that you simply make up
parameters to give you the design you want, as the chances of
finding a driver to match them are less than zero! Whenever you
aquire new driver parameters, be sure to store them on the disk
for future use. Remember, whatever numbers are being used by the
program at that time are the parameters it will store when the
store option is called. I.E. the default values of FS, Qts, and
Vas are stored.
7. If all else fails and you need some help, or if you find a bug in
the program, you can leave me a message on Compuserve:
Conrad R. Hoffman
73260,2255
8. These programs are offered with no guarantees as to their suitability
for any purpose. The writer assumes no liability for any loss or
damage resulting from their use or misuse.
9. You may copy and distribute the .ARC file as desired. Please make
NO modifications to the program, as this makes it impossible for me
to support the program or provide assistance to people.
10. You may not sell these programs for profit under any conditions.
11. No user fee is presently requested for this program. Yup, Freeware!