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Old 9th February 2010, 07:00 AM   #1
slomatt is offline slomatt  United States
diyAudio Member
Join Date: May 2005
Location: San Francisco, CA
Default Tapered dipole line source array

About 10 years ago I built a pair of tapered dipole line source arrays (TDLSAs?) using 48 Pioneer 269-469 4" full range drivers. This was an experiment in line arrays and high efficiency speakers, and ultimately I disassembled them because they were too big to keep around.

I recently ran across some photos of these on my computer and figured I'd post them up in case anybody was interested. There's a writeup on my website that contains some theory and calculations.

Dipole Line Source Arrays (DLSA) (BlankWhitePage)

The full set of pictures can be found at:

Blank Photos :: Dipole Line Source Arrays

Pieces for 1/4 of the array
Click the image to open in full size.

Cutting 48 holes takes a long time, and creates a TON of sawdust.
Click the image to open in full size.

Unfortunately this is the only picture I have of the completed arrays, and this is without the top 4 drivers on each side since they would not fit under a standard 8' ceiling. I tried wiring them both with equal power to all drivers and also as a tapered array with more power to the middle drivers. The tapered array lost some of the line-source effect, but sounded a bit better possibly because of decreased comb filtering.
Click the image to open in full size.

- Matt
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