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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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Propeller Head Plaza Technical and scientific discussion of amps, cables and other topics. |
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In Reply to: Re: Well... posted by Steve Eddy on June 23, 2003 at 00:46:01:
The web page for the AER driver lists almost no specs, so we'll have to make some up. Let's assume a BL product of 20 N/A and a suspension compliance of 1 mm/N. Although we don't know the real numbers, these are *very* conservative estimates.Below the fundamental resonance (which we will assume is the case, since we are sending a DC signal), the motion of the diaphragm is controlled by stiffness of the suspension.
So now we put in 10 mV of DC into the thing. The stated nominal impedance is 12 ohms, so let's assume a DC resistance of 10 ohms. From Ohm's Law (won't Dan Banquer be happy!) we now we have a current flow of 1 mA. This gives a displacement force of 20 mN. This gives a cone displacement equal to (drum roll, please) 20 microns.
I don't care who you are, or how "efficient" your driver is. A static displacement of 20 microns is meaningless. Assuming the diaphragm assembly weighs 10 grams (again, a *very* conservative estimate), this is 5 times less displacment force than if you mounted the driver horizontally (instead of vertically). It would be like tipping the driver forward about 10 degrees.
So Steve, stop being so pissy. Don't do a bunch of wild hand-waving and spouting mumbo-jumbo about "a whole new meaning" of efficient speakers. Just go through the math. You're obviously capable of doing so.
Charles Hansen
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Follow Ups
- OK, I'll walk you through the math... - Charles Hansen 15:43:32 06/24/03 (0)
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