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ashmostro

ashmostro

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Ok I understand this clarification, but I still disagree with the belief that there is a minimum input power that varies by driver beyond the sensitivity spec. If Driver A - I don't care how big, heavy, light, stiff, soft, etc. it is or even if it's a tweeter or a woofer - has a higher sensitivity than Driver B, it will be louder with the same input power, even if that power is just one watt. Because that's literally what the sensitivity spec is. There are no downstream forces at play that would counteract this measured reality because sensitivity IS the final downstream measurement (again, sensitivity is empirical, not calculated).

Drivers are indeed "designed for power levels" but that's based on their thermal capacity (the high end of the power spec, not the low end). Under-driving a speaker is totally fine so long as you are not clipping the input signal. There's no downside at all to that.

Again, to be super clear, I disagree that you can infer drivers with different power handling specs necessarily should be run at different power levels to sound good. As long as you are below the thermal power handling limits and you are sending a clean signal, there's no sound quality or quantity issue at all.
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ashmostro

ashmostro

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While movement in a driver doesn't have much friction, it still has suspension to fight through. Bigger woofer, more weight, more coils all need more suspension which means more resistance and ultimately more power to drive. Look up the part 1 and part 2 research papers titled "Loudspeakers in Vented Boxes" and they go over exactly this.
I am very familiar with Thiele's work, as one of the godfathers of loudspeaker engineering and the first half of the 'T-S' parameters.

This work details how a speaker *system* behaves in various enclosures and how its electrical and mechanical attributes interact with that enclosure. It's all foundational and excellent work and I take no issue with it at all.

I think what's being misunderstood here is that sensitivity is a measured outcome of all of the above. Once you have two 8" subwoofers in ideal enclosures and measure their sensitivity, whichever one is more sensitive is louder and less "resistant to motion". Bringing it back to the original point, the Audiofrog will always be louder than the Rockford in identical sealed boxes, at any power level. And its frequency response will also be optimal at any power level, until you hit the mechanical limits of the suspension.... and that's why the AF is still better. It has more linear Xmax so it's both more efficient and has more high-power potential. It's just a better sub for this application.
 

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