Home Speaker Asylum

General speaker questions for audio and home theater.

RE: Excellent point

Auditory thresholds are usually somewhat fuzzy in the time domain, and reflection detection thresholds do indeed vary with level and frequency and direction, and the subjective effect of said reflections likewise varies. But if the question is a practical one like "how far do my Maggies need to be out from the wall for the magic to happen?", then that answer is going to translate into a path-length-induced time delay that is the same at all frequencies. What I'm doing isn't exactly the same as the Maggie situation, but it's pretty close. So that's why I'm not talking about the effects of different delays at different frequencies.

Just for the record, in addition to Toole and Geddes and Greisinger, my sources include "Spatial Hearing" by Jens Blauert and an assortment of AES articles by various authors. But Toole and Geddes are the ones who the most into practical applications relevant to loudspeaker systems in home listening rooms.

Now if the question is "what matters most - getting the reflections to arrive from the ideal direction, or getting a bit more time delay?", the answer cannot be found in the published literature. It has to be determined experimentally. James Romeyn's findings on this topic surprised me, as based on my understanding of Toole I'd have told him not to waste his time trying the upfiring geometry, but in practice it outperformed other geometries that resulted in a more ideal reflection direction but less time delay.

Duke

Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.


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  • RE: Excellent point - Duke 11:06:58 10/29/16 (2)

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