In Reply to: Bad example posted by badman on November 12, 2010 at 09:37:26:
B&W bothered to get it right for mid frequencies, with as small a driver, The distances involved / frequency? Diffraction happens at edges.If you look at this mid pod it's hardly any better than the tweeter pod, the curve radius at the edges, for the frequencies involved. The radius of the curve on that mid pod will not help smooth the pod's diffraction behaviour. It will be just as poor as the tweeter pod's, not enough of a curve.
On B&W's mid pods, a far greater radius curve begins at the driver's edge, and are you saying they shouldn't have bothered?
And, why didn't AR just restrict the blanket to the tweeter on the AR9 and all the later models? They did it to damp out the Mid (and HF) waves travelling towards the sharp edges, so that they would be weak at the edge, and their diffraction there less audible.
Lastly, the ear is much more sensitive at mid frequencies.
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
Edits: 11/12/10 11/12/10 11/12/10 11/12/10
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Follow Ups
- the mid pod has effectively a 90 degree edge with very little rounding, so diffraction will not be smooth. - Timbo in Oz 10:59:15 11/12/10 (1)
- RE: the mid pod has effectively a 90 degree edge with very little rounding, so diffraction will not be smooth. - badman 15:23:55 11/12/10 (0)