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In Reply to: RE: Do all wideband drivers have rising response? posted by PaulF70 on February 15, 2015 at 20:38:44
You can't really get anything useful from this without allowing for directivity and consequently some kind of room-acoustics assumption.
The effect you describe is a consequence of using cones of real-world stiffness - it is a cone resonance phenomenon.
Follow Ups:
Paul, is this a correct translation of your statements?
1) We should really consider only in-room FR/power response - on-axis response is irrelevant.
2) Yes, all wideband high-eff cone drivers do exhibit a rising frequency response.
Thanks.
I would not go that far - speakers and how they react in a room seem to have many variations. There is a good body of psychoacoustic research about the effects of direct sound, early sound, late and/or reverberant sound, etc. Both first-arrival (on-axis) and late arrival (reverberant) spectra are important in their own way. I'm just saying that these issues are especially important with a large-diameter "tweeter"!
Most, but not all, wideband paper cone drivers, and most high efficiency midranges for that matter, do seem to have that rising response, especially if they are high efficiency. Phillips produced some excellent work IIRC in the seventies on how cone resonances behave with frequency, and that work supports the notion that the rising response is usually a characteristic. A few drivers look better than most, so not all, but most.
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