On this month's Test Bench, Vance Dickason looks in detail at an High-Power 8” Pro Sound Woofer from Italian pro sound OEM driver manufacturer B&C Speakers. This month’s Test Bench sample is the 8NDL64, the most recent high-powered 8” woofer from B&C.
On Acoustic Patents, James Croft (Croft Acoustical) discusses two loudspeaker-related patents, primarily filed under the Office of Patent and Trademarks Classification 181 for acoustical devices and 381 for electrical signal processing systems and HO4R for international patents, as well as new patent applications that are published in the Patent Application Journal.
The first one is “Inverse Horn Loudspeakers”, Patent Number: 8,781,145 by Inventor: Philip R. Clements (Chandler, AZ), filed December 12, 2011 and granted July 15, 2014.
In the patent abstract it details that, in a low-frequency transducer system with a multicompression chamber, an inverse horn structure is employed in combination with a resonance-distortion filter chamber. The filter chamber effectively expands the effective enclosure volume at low frequencies and connected to one of the compression chambers filter parasitic resonances and distortion and allowing the system to more efficiently reproduce low frequencies while being able to use smaller diameter transducers and maintaining good system sensitivity. Compression chambers are organized for constant
or continuous compression on a section-by-section basis
throughout the inverse horn system
The second patent discussed is an “Apparatus for Reproduction of Sound”, Patent Number: 8,774,424, by inventor: Stuart Fletcher (Torguay, GB), filed November 18, 2009, and granted July 8, 2014.
The abstract details an apparatus for reproducing sound including at least three loudspeakers mounted in a substantially sealed enclosure. The three loudspeakers may be mounted to a wall of the enclosure so that they are all directed away from, and evenly spaced around, a common point. Two speakers may be driven with the respective out of phase signals comprising the difference between two stereo channels and another speaker with the sum of those channels.
Finally, on Industry Watch, Vance Dickason discusses the details on the recently unveiled home-theater version of the Dolby Atmos surround technology, including the information that Atmos will support as many as 24 floor speakers and 10 overhead speakers. Dolby also says that traditional stereo, 5.1-channel, and 7.1-channel content played through an Atmos-enabled home theater will be automatically adapted to use the new system’s full capabilities, including any overhead speakers.
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