bumpy
02-08-2016, 09:59
Pair of BD15 drivers in as new condition. These are fantastic 15" drivers which I have owned from new. They have had light use both in base cabinets and open baffle
These are the bass drivers used in some of the best speakers in the World including the BD Design Swings.
"A high efficiency speaker designer, Burt Doppenberg specified his own take on a high efficiency 15" woofer. It has a smooth curvilinear cone. The shape of a curvilinear cone tends to help the driver reproduce higher frequencies, which is desirable with a driver intended for wider bandwidth usage. More importantly it sports an underhung 16 Ohm motor with a modest 3.5mm Xmax and a ring neodymium magnet. This is not a pro woofer, nor a subwoofer. This is a hi-fi midwoofer, designed with the ability to operate higher in frequency and with a notable absence of breakup peaking and extremely low distortion. The underhung motor makes for extremely high fidelity within its limits, and the 16 Ohm impedance is a welcome characteristic, allowing this woofer to be used with OTLs, which often allow more power into higher impedances. Alternatively, a pair of them in parallel gives you a nominal 8 Ohm impedance characteristic with 102dB/W/m sensitivity. The ring neodymium motor also has the advantage of a conductive magnetic material; with some advantages over normal nonconductive ferrite material used in other drivers. This driver has a strong motor due to the use of higher energy, more expensive neodymium. The powerful motor allows allows it to be similarly sensitive to other woofers despite the higher impedance: it only takes about half the current to get going compared to other 15" bass units.
Fs 35.696 BL 29.207 eta 5.2111
Qms 8.7300 VAS 287.79 L 1kHz 1.3839
Qes 0.2412 Re 13.000 L 10kHz 0.7576
Qts 0.2347 Rms 1.8127 Z F1-F2 79.290
Cms 0.2817 dBSPL 99.369 ZMax 483.61
Mmd 56.400 SD 0.0855 X-Lin (p/p) 7,0000
Mms 70.557 P (RMS)150.00 Weigth 4,9000
BD15' frequency response measured with the driver mounted in a 1200 x 1200mm open panel and standing on the floor.
http://www.bd-design.nl/contents/media/l_bd15%20frequency%20response.jpg
Here are some examples of its use
http://www.bd-design.nl/contents/media/sigma_blauw.jpg
http://www.bd-design.nl/contents/media/martin1.jpg
https://s-media-cache-ak0.pinimg.com/564x/e5/cf/57/e5cf57e3b23f919843109ac48a2c2393.jpg
http://www.soundstage.com/avtour2008/oct10a/horn_speaker.jpg
These are the bass drivers used in some of the best speakers in the World including the BD Design Swings.
"A high efficiency speaker designer, Burt Doppenberg specified his own take on a high efficiency 15" woofer. It has a smooth curvilinear cone. The shape of a curvilinear cone tends to help the driver reproduce higher frequencies, which is desirable with a driver intended for wider bandwidth usage. More importantly it sports an underhung 16 Ohm motor with a modest 3.5mm Xmax and a ring neodymium magnet. This is not a pro woofer, nor a subwoofer. This is a hi-fi midwoofer, designed with the ability to operate higher in frequency and with a notable absence of breakup peaking and extremely low distortion. The underhung motor makes for extremely high fidelity within its limits, and the 16 Ohm impedance is a welcome characteristic, allowing this woofer to be used with OTLs, which often allow more power into higher impedances. Alternatively, a pair of them in parallel gives you a nominal 8 Ohm impedance characteristic with 102dB/W/m sensitivity. The ring neodymium motor also has the advantage of a conductive magnetic material; with some advantages over normal nonconductive ferrite material used in other drivers. This driver has a strong motor due to the use of higher energy, more expensive neodymium. The powerful motor allows allows it to be similarly sensitive to other woofers despite the higher impedance: it only takes about half the current to get going compared to other 15" bass units.
Fs 35.696 BL 29.207 eta 5.2111
Qms 8.7300 VAS 287.79 L 1kHz 1.3839
Qes 0.2412 Re 13.000 L 10kHz 0.7576
Qts 0.2347 Rms 1.8127 Z F1-F2 79.290
Cms 0.2817 dBSPL 99.369 ZMax 483.61
Mmd 56.400 SD 0.0855 X-Lin (p/p) 7,0000
Mms 70.557 P (RMS)150.00 Weigth 4,9000
BD15' frequency response measured with the driver mounted in a 1200 x 1200mm open panel and standing on the floor.
http://www.bd-design.nl/contents/media/l_bd15%20frequency%20response.jpg
Here are some examples of its use
http://www.bd-design.nl/contents/media/sigma_blauw.jpg
http://www.bd-design.nl/contents/media/martin1.jpg
https://s-media-cache-ak0.pinimg.com/564x/e5/cf/57/e5cf57e3b23f919843109ac48a2c2393.jpg
http://www.soundstage.com/avtour2008/oct10a/horn_speaker.jpg