Fullrange Speakers Horn Speakers     Theory   Horn Drivers   Horn Size and Shape   Horn Design   Exponential Calculator   Tractrix Calculator   Fostex Simulations   Lowther Simulations   Resources and References DIY Projects Other Stuff Fullrangedriver.com
		Tractrix Contour Calculator by James Melhuish thanks to Ketil Parow for psuedo code This applet calculates a table of figures for a Tractrix horn showing distance from throat, radius, effective square side length, cross sectional area, and contour width (for your given horn width in a parallel sided horn). All dimensions are in centimeters (cm) and are precise to one tenth cm (one mm). Throat area (cm2) — decimal (for example: 70, or 70.35) Flare frequency (lower frequency cutoff) (Hz) — must be a positive integer (for example: 40, or 56) Size factor (1 for mid or high frequency front horns, bass horns: 2 for center of room, 4 for against a back wall, 8 for corner placement). Desired width of horn cabinet (cm) — decimal Click Calculate and wait! (it's a little slow) You need Java 1.0 or 1.1 or 1.2 installed to run this applet You can copy this table of figures to the clipboard and paste it into Excel or 123 or other spreadsheet program in order to print or manipulate the data. Notes: You will find that the length of a horn, especially a bass horn, quickly gets long and the mouth gets very large as you lower the fc. If designing a bass horn, you might want to shorten it so the horn is a more manageable size. One acceptable method is to use a quarter wavelength of the fc as the minimum length. For further information, consult Ketil Parow's Big Fun Horn article. Top