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-
- *******************************
- ** 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!