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In Reply to: RE: Can It Be a Horn If It Doesn't Look Like One? posted by Bill Fitzmaurice on November 05, 2024 at 07:27:22
Awful frequency response. But at least EV proudly published it?!
Follow Ups:
That's a measurement at the limit of resolution then, not one smoothed to say 1/3 oct or more like many / most nowadays.
What one can see or to me, if i had to pick one, it would the the sp12 radax. That one (the measurement there) appears to have the least discontinuity and measurement "grass" both of which are counter indicators of a speaker that can make a strong phantom image in stereo.
The response flatness is a separate issue you would hear strongly as in very bright but it's simple shape and it's impedance curve would make it easy to fix even passively nowadays.
In general, the smaller coax drivers that have a horn at the center under the dust cap and use the cone body itself as part of the horn, can have the least discontinuity at the horn to cone radiation and that cone can then itself drive a "front" horn (if the horn angle is at or greater than the cone angle and the smallest possible discontinuity at the transition. At the opposite, there are some larger cone drivers that have a large horn attached at the center which have the discontinuity lower in frequency where the acoustic relationship makes them closer together and less significant
Using these drivers usually requires working out a network (in a passive speaker) to make the crossover and combined response flat or what ever.
In some drivers an adapted crossover shape can allow for a much smaller phase shift through crossover than normal as the hf signal emerges from the high pass filter before the woofer but is behind the woofer and so where everything is right, with a higher order filter, you can get less than 90 degrees per order phase shift, even zero like a single driver.
Frequency response isn't everything. High sensitivity and low distortion are the hallmarks of horns. Besides, the ragged response above 1.2kHz isn't from the woofer, it's from the high frequency unit.
I was interested because I almost bought a EV Regency III. If I bought any of these EV's, I'd be interested in changing out the horn/CD's on'em.
i would love to hear this now
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