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In Reply to: RE: 15" Woofer for 2-way project posted by Inmate51 on November 06, 2014 at 08:19:33
"A 15" has very limited dispersion at 800 Hz."Yes, limited to 90° or so.
A two-way crossed at 800hz to a 90° horn will work well, but have a touch of FMD (gargle) if you play program material with deep bass (and anything with midrange at the same time).
The link goes to a 12" two-way with a sub, this would be what I would do(but with a PPSL for the sub).
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Note: I did the network design and provided the drivers for the tops in the auction. They measure about ±1dB from 100hz to 1.2Khz, and ±2dB out to 16Khz. John was locked in for the 2245 for the sub, otherwise he may have gone PPSL for the sub.
Edits: 11/13/14Follow Ups:
Thanks to all that provided feedback. The JBL looks interesting. Here is a comment from the literature on the pi speaker's website. "The JBL 2226 can be used for such an implementation. One look at the response curve of a JBL 2226 shows that it generates very little output above 1.6kHz, and the speaker sounds clean up through the midrange. So a tweeter circuit that is designed to bring it online between 1kHz and 2.0kHz blends very well with these woofers – even with no woofer crossover at all. However, it is also evident that there is a slight increase in output just below upper cutoff, and this is reduced by adding inductance to the system."
The increase in output is on axis only.
Putting an aperature plate in front of the driver (like the newer Eon series) makes it sound much better for a higher crossover point. Years ago I did this with a simple piece of cardboard in front of the driver with a rougn opening of about 80 square inches with the long axis in the vertical (to maximize horizontal dispersion).
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