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    The Woofer Box and Circuit Designer is an advanced subwoofer design tool using MS Excel. It has a complex box model that can show either sealed or vented box results. However, it also has a filter section that allows you the ability to model a very wide range of filter response shapes. The intent of this program is to give you the tools you need to design a subwoofer using a wide variety of available plate amps, many if which posses varying degrees of equalization or adjustment, as well as other crossovers, digital processors, and equalizers as well.

    The features of the filter section include a five band parametric equalizer, two stage second order high pass filter (to model boost, and possibly a lower infrasonic filter as well, or a 4th order High Pass filter), a selectable low pass filter that offers  a number of response shapes up to Eighth Order L-R. And new to this version is a Linkwitz Transform section. This section also has feature to allow you to import a room response curve or an external filter response shape if you should desire. (continued at bottom)

 

Current Version 3.0    Date: August 2005
Copyright  -  Jeff Bagby  2004 - 2005

To Download Box and Circuit Woofer Designer
(A Self Extracting Archive for Windows containing an Excel Spreadsheet)

Excel File Size 633 k     -    Download Size 178 K

 

    Graphs are provided that show frequency response, phase, impedance, maximum output, filter response, cone excursion, vent velocity, group delay, and Impulse Response. All calculations and graphs include the effects from the filters settings selected.

    Finally, buttons are available to output final frequency response and phase to an frd file and impedance to a zma file (text files readable by other software). You can also save the circuit response as an frd file as well, to use in other software if desired. You may also save woofer and box parameters to a session file to build a library or designs, and you can save filter settings to a separate file. This allows you save a particular plate amp’s response and use it many different woofers as you design.

    New to version 3.0 includes the ability to change the frequency range to whatever range is desired. This range will then be used for all calculations, graphs, and save files (frd and zma). Also new is the ability to save any graph whatever size and shape desired as a small gif file. This will be very handy for posting plots to websites or emailing them to others. Finally, a correction was made to the saved frd data, as it was found to not be correctly saving the phase information in version 2.0  (You will notice a slight change in the name of the file, as it is not for subwoofers exclusively anymore)

    Note: The file requires Excel 2000 or higher with Service Pack 1 and 2 installed and must have the Analysis Toolpak installed in the add-ins. Some foreign versions of Excel have not been able to run this program