BHFProfessional wrote on Thu, 14 October 2004 00:59 |
I see a lot of people using single and dual 18" boxes. It's like the industry standard or something, for pro sound companies to have a large inventory of dual-18" enclosures. But what I'd like to know is, why aren't 21" woofers like this one (see picture) in wider use?
P-Audio SD-21
This has a 6" Voice Coil (!) and extends down to 30 Hz. It also handles 1000w per driver RMS, 2000w max. A dual-12" cabinet could handle 4000 watts with just one unit.
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21" woofers are limited in selection. Beyma, Precision
Devices, and, P Audio, are the only companies (To my
knowledge) that make 21" tranducers.
The Beyma is designed for a Reflex Cab {QTS 0.43}
The Precision Devices is designed for a Horn-Loaded Cab. {QTS 0.19}
The P Audio is designed for a Horn-Loaded Cab. {QTS 0.22}
So, IMHO if the QTS was around 0.3 - 0.35, you would see
Dual 21's popping up. For the extension, of a dual 18 cab,
will require a very large box, for the Beyma, and, for a
21" horn, the cabinet size will be too large, using the P
Audio, and, Precision Devices.
Best Regards,