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-
-
- Box Plot For Windows 3.0
-
- By Rick Carlson
- For Sparta Sound Co.
- COMPUSERVE 71041,3015
-
- SHAREWARE VERSION 1.0
-
-
- Box Plot is a Microsoft Windows based program that shows
- the frequency response and maximum Sound pressure level
- of a given Loudspeaker/Box Combination.
-
- This Version of Box Plot requires Microsoft Windows 3.0
- or later to run. A math coprocessor is not required but
- really helps speed things up if you want do alot of
- iterations on the box parameters.
- (Turn off Auto Plot on slow machines).
-
- If Terms like Qes, Fs, Vas are unfamiliar to you, then
- this program will be difficult for you to use. It is intended
- for the audio hobbyist or professional interested in building
- there own speaker enclosures, or modifying their present
- system.
-
- If you are interested in building your own speakers, I would
- suggest that you subscribe to Speaker Builder Magazine. It
- is a good source of information on this subject.
- (Unsolicited advertisement)
-
- ============================================================================
- History:
-
- Box Plot is based on a program called Boxresponse, which
- was published in Speaker Builder magazine a while back. Box
- Plot adds graphical output, MS Windows compatability,
- printing, file storage, and a couple of other new features to
- the original BASIC version of Boxresponse.
-
-
- Operation:
-
- This Program was designed to allow 'almost' real time
- update of the response plot as box parameters are changed.
- This is usefull when trying to shoehorn a speaker into a non
- optimum box. Many different combinations of box parameters
- can be tried in a short period of time. If Auto Plot is
- turned on, then clicking on the OK button of the BOX
- Parameters dialog box will replot the response curves.
-
- Speaker Parameters:
-
- Speaker parameters are entered into a dialog box. When
- done, click on the OK button to save the parameters. The
- Parameter names are the Thiele Small Parameters specified on
- most good spec sheets.
-
- Box Parameters:
-
- Box Parameters are entered in a dialog box. When the OK
- button is clicked the Box Parameters dialog box stays on the
- screen. To close the dialog box click on the Close button or
- use the system drop down menu (upper left of dialog box) to
- close the box. The reason the dialog box stays on screen is
- to make it easier to edit parameters and see the effect on
- frequency response.
-
- There are 6 types of boxes that can be modeled with Box Plot.
- Closed Box:
- Simple sealed Enclosure.
- Closed Box with first order equalizer:
- Sealed box with first order filter. The first order
- filter usually provides subsonic attenuation.
- Closed Box with second order filter:
- The second order filter is usually an active filter
- placed before the power amp. This filter can be used
- to extend the low end, or modify the response of an
- existing system.
- Vented Box:
- Box with tuned port.
- Vented Box with first order eq:
- First order Eq is more usefull here than is a sealed box.
- Vented Box with second order eq:
- Same as sealed box.
-
- Comments:
- The comments field is a text string, 255 chars long that
- can be used to annotate the graph.
-
- Vent Design:
- This box will show the vent length based on the present
- box/ speaker combination.
-
- Auto Plot:
- When the Auto Plot menu item is checked, anytime a speaker
- or box parameter is changed, the graph will be regenerated.
- This keeps the graph up to date with the latest parameters.
- This also may be annoying on slower machines so it can be
- turned off.
-
- File:
- New:
- This will reset all parameters to some predefined settings.
- The settings are based on nothing at all, just some numbers
- that wont do real wierd things. (The speaker parameters are
- from a well known manufacturer.)
-
- Save:
- Save as:
- This will save the speaker, box, and comments in the specified
- file. (Registered Versions)
-
- Open:
- Read a file on the disk. The default file extension is .SPK
- but has no real significance.
-
- Print:
- This will print the response curves as shown on the screen
- along with the speaker and box parameters. (Registered versions)
-
-
- In the Unregistered shareware version, files cannot be saved
- and the response curves cannot be printed. Please register
- to recieve the complete version, as well as updates and
- bug fixes, as they become available.
-
- To register Please send $25.00 to
- Rick Carlson
- 62 Fox Trail Rd
- Sparta, NJ. 07871
-
- Compuserve 71041,3015
-
- I will send out a disk with the complete version, and some
- more on line documentation.
- If you have suggestions, comments, bug reports or just feel
- like writing please do so.
- Let me know what other kinds of programs would be usefull to
- the audiophile.
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