DIY Tapped Pipe Subwoofer (Tapped Horn) - Now With Drawing - BassLaunch

Описание: This was an experimental project to see if a tapped horn could be built with no expansion taper. The name of the project is BassLaunch. The line has a straight profile, and wraps around itself in the shape of the letter "G" when viewed from the left side of the box. Four 4" aluminum-cone drivers provide the surface area of a single 8" driver, but in a compact straight-line format that fits easily into the line. The four drivers also produce a self-interference pattern at high frequencies that reduces distortion coming from the drivers and also reduces excitation of pipe resonances outside the system bandwidth. (This also limits the upper bandwidth of the design to 250 Hz.) This unit has a tuned line frequency of 45 Hz and provides a F3 of 40 Hz, low enough for bass guitar. Simulation was done in Hornresp. The cross-sectional area of the line is the other major variable you can play with (apart from line length which determines the tuning frequency) and the ratio of line area to driver area determines the damping of the design and impacts the flatness of the bass response. Here the ratio is a little over half. Some nice bass and nice air movement are produced. Another important detail is that the reactance of the air mass in the line lowers the effective Fs of the drivers. In this unit, the Fs of the drivers is 65 Hz but flat bass extension to 40 Hz is achieved. Nearfield measurements at the terminus show the response is very flat - less than +/-1 dB over the operating bandwidth.

New: Drawing of the innards: http://www.taterworks.com/www/uploads...