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In Reply to: RE: 6 - 7 octaves if you're into low fi... posted by Thorsten on July 11, 2012 at 13:30:22
I don't remember seeing measurements of a 12" or 15" woofer at 45° looking 'flat' above 1,500 Hz. Flexible cone or not, and whatever its shape is.
Yves
Follow Ups:
Hi,
> I don't remember seeing measurements of a 12" or 15" woofer at 45°
> looking 'flat' above 1,500 Hz. Flexible cone or not, and whatever
> its shape is.
Why would remotely desire flat response at 45 Degrees? I would desire significant SPL Rolloff, ideally all the way to the bass, but practically to as low as possible, which incidentally mandates a large acoustic structure (Baffle, Horn, Cone).
Ciao T
Sometimes I'd like to be the water
sometimes shallow, sometimes wild.
Born high in the mountains,
even the seas would be mine.
(Translated from the song "Aus der ferne" by City)
...he's moreso referencing the beamwidth transition from driver to driver in the crossover region. A radical shift in dispersion in the crossover region is not generally filed under "well blended".
You would think coincident driver arrangements would avoid lobing tilt issues though...
Cheers,
Presto
Hi,
> I think he's moreso referencing the beamwidth transition from driver
> to driver in the crossover region.
Alas, so am I.
Of course we need to match woofer's and tweeter's off axis response. However HF drivers exist with any dispersion pattern under the sun (and absent something suitable simply design a suitable waveguide), so it is up to the designer to match the HF directivity to that of the LF.
Now just because this directivity (Index) is high for the LF it does not follow that there will not be a smooth transtition.
> A radical shift in dispersion in the crossover region is not
> generally filed under "well blended".
Well, what can say? You are preaching to the first apostle perhaps?
> You would think coincident driver arrangements would avoid lobing
> tilt issues though...
They do. I am quite fond of Coaxials, back to the old Schulze/RFT TH315 (developed from the first ever coaxial be Dipl Img Exckmiller) I owned i n the 80's.
Ciao T
Sometimes I'd like to be the water
sometimes shallow, sometimes wild.
Born high in the mountains,
even the seas would be mine.
(Translated from the song "Aus der ferne" by City)
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