B&C Speakers 21SW150 21” Woofer

January 15, 2008 by David Kay
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B&C Speakers of Italy have just released the latest (and largest) driver under their LF Nd range, the humongous 21SW150 21” woofer. The 21SW150 features a 1500 watt continuous power rating, a very large 6” copper voice coil and 60mm of maximum excursion. Sensitivity is rated at 95dB, and impedance is 4 Ohm. Given its huge size, the frequency response of the 21SW150 is rather strange, it isn’t a conventional subwoofer.

The 21SW150 is rated at 30Hz – 1kHz, but it begins to roll off sharply below 80Hz. Its response curve is similar to a typical 6.5” midrange driver, making the 21SW150 more suited to PA systems that require substantial SPL in the lower midbass range than those looking for extremely low frequency output. And if you’ve just got to have the biggest woofer in town, the Clarion SRW8000 32” and Audiobahn AWT34X 34" subwoofers are larger, but much more expensive.

B&C 21SW150 Price: $699.95

Source: US Speaker
Source: B&C Speakers
Comments (2)
Mike Edgar 1 year and 5 months ago

I don't know, it is still a 21" sub with 15mm of one way stroke. I would be willing to bet it would do OK on the bottom purely do to it's sheer displacement. It also has reasonably low Fs, I don't really understand the accompanying FR plot..... 21" cone would beam pretty bad as an upper bass/midrange, anyway, right?
NCP 10 months and 2 days ago

Hi David,
I was wondering if when reading the response curve for this driver if perhaps the seeming high roll off point is due to the fact that a lot of manufacturers show a combined box/raw driver curve that also shows the vent's output?

Every sub out there rolls off at around 100 cycles if you measure it in free air on a baffle.

I promise this driver gives VERY SOLID OUTPUT TO AROUND 30 HZ when used in a correctly aligned enclosure.
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