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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: OK, let's try a different angle. It's an AC circuit, right?. posted by Geoffkait on May 29, 2025 at 08:16:20:
Hi
IF you were to measure a sealed box woofer that had the normal flat frequency response, or one in a vented box, or one in free air, you see the impedance curve is not anything like flat, like the SPL.
IT is that impedance that governs how much current is flowing and how much force the VC is producing.
What you can see clearly it the current flowing is nothing like "flat" magnitude BUT the input Voltage IS flat (same V at any frequency) and in the middle of it's range so is the sound pressure. The Voltage is the signal.
It is the Voltage (being flat vs frequency) that produces the flat SPL vs frequency while the current varies wildly vs frequency. Examine the impedance curve shape being upside down, now you have the shape of the current being applied.
The reasons are described earlier in the Back EMF explanation.
However, for an electrostatic speaker it is the Voltage it self and not current that is proportional to force on the radiator.
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Follow Ups
- RE: OK, let's try a different angle. It's an AC circuit, right?. - tomservo 06:19:00 05/30/25 (3)
- RE: OK, let's try a different angle. It's an AC circuit, right?. - Geoffkait 06:32:49 05/30/25 (2)
- RE: OK, let's try a different angle. It's an AC circuit, right?. - tomservo 07:09:50 05/30/25 (1)
- RE: OK, let's try a different angle. It's an AC circuit, right?. - Geoffkait 09:19:11 05/30/25 (0)
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