Hadn't seen this design mentioned on DIYaudio yet, so thought I'd post it.
Cardioid subwoofer response is usually achieved with DSP processing of the signal fed to one woofer in the cardioid woofer array. In this case, the designer has figured out how to do the processing acoustically so no need for DSP or the second power amplifier. PSP = Plywood Signal Processing
All three tuning frequencies for the array are evenly distributed in the operating band providing a nice smooth impedance curve.
More details can be found in the September issue of Live Sound International.
I attached a copy of the patent application.
A couple links to get you going...
d&b's B4: from ugly duckling to sub-bass swan
d&b audiotechnik - B4-SUB
Cardioid subwoofer response is usually achieved with DSP processing of the signal fed to one woofer in the cardioid woofer array. In this case, the designer has figured out how to do the processing acoustically so no need for DSP or the second power amplifier. PSP = Plywood Signal Processing
All three tuning frequencies for the array are evenly distributed in the operating band providing a nice smooth impedance curve.
More details can be found in the September issue of Live Sound International.
I attached a copy of the patent application.
A couple links to get you going...
d&b's B4: from ugly duckling to sub-bass swan
d&b audiotechnik - B4-SUB
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