From a modal perspective it may, but consider that perhaps at these lower frequencies the baffle has fallen into the nearfield and the acoustic impedance has changed.
That driver has a relatively small xmax, and a high Fs, and was really designed to be a pro audio midrange or guitar. Not sure why it would be selected for use as a home audio woofer.
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I'm using it as a midbass driver from approximately 80Hz-1kHz. Others have used it with success in similar applications (the diysoundgroup HTM-12 is one example). It has much more volume displacement capability than typical home audio woofers (~250cc). A 6-7 inch woofer would need ~20mm one-way xmax for the same displacement.
I see resonances at approx. 300, 600, and 1200Hz in the factory curve as well as the one at HiFiCompass. Interestingly, I'm not seeing the 300 or 600Hz resonances in my own measurements.
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But there are a lot of unexpected wiggles. There is a dampng resonance just under 600 Hz. Close enuff.
dave
dave
I'd imagine that some of the wiggles are due to reflections in the room. I intent to do measurements outside sometime soon, so I guess I'll find out then.
I'm aware. Impedance measurements are affected by sound in the room because loudspeakers act as microphones too. Clap during the measurement and you will see it in the impedance and phase graph.
But a typical impedance measuremnt happens so fast that room does not have time to affect things.
I have done 1,000s (probably 10x that) and rarely see trains like in your woofers. They are usually in big drivers with audiable resonances. And can be heard even if they do not show up in measurements.
dave
I have done 1,000s (probably 10x that) and rarely see trains like in your woofers. They are usually in big drivers with audiable resonances. And can be heard even if they do not show up in measurements.
dave
I was going to ask if this result is repeatable. Sorry if it's been said already but this talk of outside influences, not to mention that on occasion computer based measurements just come out wrong for no obvious reason.