This is a lightly used Beyma 15LW30 neodymium woofer. I purchased a pair of them from US Speakers a couple of years ago, and this one was in a box hooked up to my wife's electronic drum kit in our basement. We need to downsize the speaker box st something that takes up la lot ess space. This woofer was never been abused or overdriven; the drum kit was never turned up above modest practice levels.
The 15LW30 is no longer available in the US. A Google search shows them still available from a couple of Eurpoean vendors for 220 to 262 Euros apiece. Here's one of them:
http://www.n-joymusic.nl/beyma-15lw30-p-3915.html
Interesting characteristics of this woofer are long excursion (7 mm x-max); unusually smooth midrange and good top end extension (no nasty peaks, and -3 dB at about 2.8 kHz on-axis); parameters that work very well for a bass cab (Fs = 32 Hz; Qes = .28; Qts = .29; Vas = 325 liters); fairly high efficiency (97.4 dB based on T/S parameters, and rated at 99 dB); fairly high thermal power handling (500 watts AES, 1000 watts program; in practice power handling will be excursion-limited); and finally, it only weighs about 10 pounds.
The obvious competition is the Eminence Kappalite 3015. The 3015 is about 1 dB more efficient, while the 15LW30 goes deeper and is smoother above 1 kHz. Both have comparable top-end extension, though of course both will be beaming badly in the top end. The claimed linear excursion of the 15LW30 is greater (7 mm vs 5.9 mm), and in both cases I think the linear excursion spec is based on harmonic distortion measurements rather than physical voice-coil overhang. I don't mean to take anything away from the Eminence, as it should be noted that the Beyma is also a considerably more expensive driver.
If you'd like to see Beyma's spec sheet on this driver, first go to this link:
http://profesional.beyma.com/
Click on "productos" in the upper left-hand blue box.
Then over on the right-hand side, click on "Descatalogados".
Scroll down and click on "15LW30".
This woofer's T/S parameters make it unusually flexible, and it models quite well in cabinets between 2.5 and 6 cubic feet. In a 4.5 cubic foot box tuned to 48Hz, this woofer will reproduce the 55 Hz first harmonic of a low A at full power, only -1 dB! If you don't need that sort of extension, then you can use a smaller cabinet.
My asking price is $100 plus shipping.
I would be glad to do a rough cabinet design for the buyer (internal volume and port dimensions). It is possible that I could build a cabinet for the buyer, but we'd have to negotiate that separately.
Thanks for taking a look.
Duke LeJeune
AudioKinesis
Preston, Idaho.
audiokinesis at yahoo dot com
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