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Speaker Asylum General speaker questions for audio and home theater. |
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Speaker Asylum General speaker questions for audio and home theater. |
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In Reply to: and on that note... posted by WildWest on August 31, 2004 at 21:23:43:
The driver that move the "fastest" (or maybe more correctly, accerlerate "fastest") for a given input signal is the driver with the highest sensitivity and the widest bandwith (HF extension).For a given signal and driver, increase the motor strength and the driver becomes "faster". For high frequencies ultimately the drivers lowpass nature will be the limiting factor on how "fast" the driver moves due to the input signal.
Now, put a transformer before a driver and that will diminish the rise time of the driver, obviously reducing the BW at the same time.
So a driver with lower sensitivity will accelerate less than a driver with high sensitivity if the BW is the same and the input signal is the same. But this is no problem as long as the "slower" driver has low enough THD. You simply give the slower driver an amplified signal ofthe same typ as the high sensitivity driver receives, and VIOLA, the "speed" is the same.
So, a 0.1g dome of 90dB sensitivity and BW of 60k will be "faster" than a 0.005g ribbon with a limiting transformer and its BW of 30k.
This is simple physics, and your mental model of how things work is totally irrelevant.
Another factor on how "fast" the driver is, is about damping. IOW the moving element should not only accelerate fast to a input signal, but should also stop "fast" when the signal stops. The impulse respons and waterfall plot/CSD is the methods to make this visible. I have not seen any evidence on that ribbons is inherently better than domes in this regard. Mass is only relatively interesting since the damping affects this very much. Add mass and the driver gets underdamped with more ringing, add damping and things get back to normal.
The only thing that is interesting is BW, decay and distortion... well directivity and power respons also. "Fast" is something you need to use in context, not merely by itself. "Fastness" in this discussion is about force in relation to mass and damping in relation to mass.
If I did miss something here, please point it out, but I think I summed it up well.
Happy listening!
/Peter
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Follow Ups
- Re: and on that note... - Peter 01:59:46 09/01/04 (2)
- Re: and on that note... - WildWest 07:15:53 09/01/04 (1)
- Re: and on that note... - Peter 09:59:48 09/01/04 (0)
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