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RE: Ping tomservo regarding US patent US4845759A

Posted by Rafaro on January 11, 2023 at 15:02:52:
Yes Bill but the sources in this design are Within the three wavelength max freq and horns uniting as they do may fullfill the criteria of Tom's patent. Just curious as to his opinion on this. The augmentation of SPL in Tom's patent and nearfield only 3dB per distance loss seems related to constructive interference of a more planar wave exit pattern. As far as Griffin's paper line arrays for home use been there done that. It has limited usefulness mainly limiting ceiling floor reflections. That is good but side reflections are still a major problem requiring room acoustic treatment. Having done professional recording mixing and mastering showed me the importance of room acoustic treatment...well worth the money! For home use the nearfield only 3dB per distance loss is irrelevant as opposed to live sound where it is very useful. The different arrival times intrinsic to long column arrays (necessary for nearfield critical distance) blurs the mid high freq resolution. The solution is a limited number of highly efficient horn line array cabs avoiding the long lines of inefficient direct radiation cabs. I notice you have designed similar DIY versions yourself!