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Free crossover and box design software for Macs
Free crossover and box design software for Macs
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Old 13th April 2019, 05:20 AM   #1
ralphgonz is offline ralphgonz  United States
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Default Free crossover and box design software for Macs

I wrote these programs using Microsoft QuickBasic in the 1980's and 1990's, and am resurrecting them because there is so little modern Mac speaker design software available. The user interface (particularly that of LMP Pro) is embarrassingly poor even for the time period, but the programs are still useful.

You can run them on modern Macs by simply installing System761.zip, which bundles the BasiliskII emulator: Mac OS 9 for OS X/macOS

Once you've installed and started System761, drop the LMP.hqx and TB.hqx archive files onto the System761.app icon in your Applications folder. This automatically copies them to the desktop of the emulated computer. Now in the emulation open Mac68K HD > utilities > Stuffit Expander 5.5, and drop the archives onto Stuffit Expander.

LMP Professional is for crossover design. In some ways it is simplistic: you model your drivers by selecting the cutoff frequencies, slope, and Q that best approximate their response curves. Nonetheless there is basic support for modeling diffraction loss (response step) and interdriver time delay. You define the crossover either by providing component values for standard topologies or by entering the transfer function manually, and LMP plots the summed frequency and phase response. The program accompanied a 3-part 1987 article for Speaker Builder Magazine, An Introduction to Frequency Response and LMP, available here. Did I mention the user interface sucks?

TopBox was a collaboration with Joe D'Appolito, and has held up very well since it's inception in the 1990's. It supports 8 different closed, vented, and bandpass alignments and produces magnitude, max SPL, max input, and impedance plots. TopBox can automatically compute optimal box volume and tuning for a given driver.
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File Type: png lmp-design.png (17.4 KB, 62 views)
File Type: png lmp-graph.png (12.8 KB, 59 views)
File Type: png tb.png (29.2 KB, 61 views)

Last edited by ralphgonz; 14th April 2019 at 03:39 PM.
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Old 14th April 2019, 03:48 AM   #2
ralphgonz is offline ralphgonz  United States
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For technical types, LMP Pro lets you define the crossover in terms of the factored or unfactored transfer function, as well as via conventional component values. Here is an example for the midrange driver in a 3-way system.
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File Type: png lmp-factored-midrange.png (19.1 KB, 49 views)
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Old 14th April 2019, 10:15 PM   #3
bea is offline bea  Germany
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Another option is to install Wine for Mac (WineHQ - Run Windows applications on Linux, BSD, Solaris and macOS) which also requires Apple's X11 implementation. It will allow to run many windows applications, among them LSPCAD, an old 16bit shareware which i find quite useful.
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Old 15th April 2019, 12:11 PM   #4
DrBoar is offline DrBoar  Sweden
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This is nostalgia. I had TopBox running on my Powermac 7200, I recall it had problem with OS 8. I do did like the program
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