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In Reply to: RE: All Done by Magnets! posted by cawson@onetel.com on May 29, 2023 at 05:47:24
Current doesn't affect excursion. Voltage swing does. With a given voltage swing the cone/coil of a higher sensitivity driver will move further than a lower sensitivity driver. By the same token a lower sensitivity driver requires higher voltage swing to realize the same excursion as a higher sensitivity driver. It's as simple as that. Bringing coil acceleration into the picture just clouds the issue, as it's a different question entirely.
Follow Ups:
Bill- You're splitting hairs. An increase in either voltage or current will increase the power being sent to the speakers, but this is academic.
Truth is that the more powerful the magnet and the closer the coil is to the magnetic force, the greater the sensitivity of the driver. So, it's all done by magnets as my tongue-in-cheek revised Title implies.
Splitting hairs is what transducer engineers and loudspeaker designers do. It's how we make our living. Current is moot. What causes a cone to move is voltage. Unless you have a transconductance amplifier you can't increase current to realize more output, you increase voltage. Magnet size affects sensitivity, but so does coil gap, Mms, Qts, Cms, Le and more. So yes, it can be done with magnets, but by no means is it all done with magnets. For every driver with a given size magnet there's a lower sensitivity driver with a larger magnet and a higher sensitivity driver with a smaller magnet.
> Splitting hairs is what transducer engineers and loudspeaker designers doI don't think the OP wanted hairs split
> Magnet size affects sensitivity, but so does coil gap, Mms, Qts, Cms, Le and more.
Exactly what I was saying, but in words that may make more sense to a non-speaker designer
Let's leave it, we both know what makes a sensitive driver and hopefully the OP has had his question answered!
Edits: 05/30/23
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