In Reply to: What to make of the Audio Science Review of the Magnepan LRS ? posted by peppy m. on March 20, 2021 at 08:51:22:
Amir produces some interesting work. His analysis of the LRS's is not one one of them.The sound propagation pattern of a point source is an expanding circle, a cone shape if you will. It reflects off the ceiling and floor as well as the walls, has no (useful, only destructive internal interference) rearward propagation. The SPL decays as the inverse square of the distance.
The sound propagation of a line source is radial about the vertical axis of the transducer and has no floor or ceiling reflection to speak of. The SPL decays linearly from the source. This does not even include dipole propagation.
Using measurement methods developed to quantify the performance of point source speakers to measure a line source, not to mention a dipole is ludicris. It is like using a ruler to measure liquid.
Daniel von Recklinghausen, the renowned audio engineer at EAD and KLH is famous for this old chestnut: "If it sounds good and measures bad, - you've measured the wrong thing."
Edits: 03/21/21 03/21/21 03/21/21
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Follow Ups
- RE: What to make of the Audio Science Review of the Magnepan LRS ? - SteveJewels 07:59:01 03/21/21 (6)
- agree: the assumptions of the inverse problem are probably not held - DrChaos 22:48:06 03/21/21 (0)
- Just to clarify- for any practical-sized line source, there will be...- - MWE 08:27:02 03/21/21 (4)
- RE: Just to clarify- for any practical-sized line source, there will be...- - SteveJewels 08:55:01 03/21/21 (3)
- It's basic acoustic physics. Dispersion widens with... - MWE 10:27:11 03/21/21 (2)
- RE: It's basic acoustic physics. Dispersion widens with... - SteveJewels 17:53:10 03/21/21 (1)
- Instead of saying "larger wavelength", let's say... - MWE 18:37:33 03/21/21 (0)