For some audiophiles, having a huge, low-cutoff bass horn built into the wall of the listening room represents the ultimate low frequency solution. Without considering the practicalities of such an installation, this paper will look at the performance of low frequency horns mounted in the wall of a small room compared to the performance of a typical point source closed box type sub-woofer and an array of such sub-woofers. Simulation results indicate that in addition to higher efficiency, the horns provide smoother response in the listening position and less seat-to-seat variation.
https://www.aes.org/e-lib/browse.cfm?elib=20265
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