bumpy
18-07-2016, 10:42
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.
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 (presumably) 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 to the nonconductive ferrite material used in most other drivers. This driver has a very 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, since the impedance is doubled.
Price is £400
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 (presumably) 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 to the nonconductive ferrite material used in most other drivers. This driver has a very 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, since the impedance is doubled.
Price is £400