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In Reply to: RE: a basic speaker question.. posted by E-Stat on July 30, 2016 at 13:44:26
nt
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The driver's piston diameter (typically about 1" less than driver size) should never be used for frequencies smaller than the wavelength or else the imaging will be compromised.
Huh? Start with a wavelength calculator as found here .
First example: New Advent with 9" piston crossed over at 1500 hz.
Wavelength is 9.04 inches. Ok.
Second example: Polk LSi9 with 4" piston crossed over at 2500 hz.
Wavelength is 5.4 inches. Ok.
JBL 4311 with 4" piston crossed over at 6000 hz.
Wavelength is 2.25 inches. Fail!
So that would indicate that pretty much all full range drivers cannot image properly?
I don't have any experience using FR speakers but a lot of experienced audiophiles seem to like them.
Directivity varies greatly by frequency. What I find less disturbing is those designs start exhibiting a gradual narrowing of dispersion as frequency goes up. There's no drastic contrast.
With the JBL's I mentioned, however, the 5" midrange is driven beyond its ideal range - so far ok - but then is transitioned immediately to a wide dispersion dome tweeter sitting right in the middle of its sweet spot.
Huge contrast!
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