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Planar Speaker Asylum Welcome! Need support, you got it. Or share your ideas and experiences. |
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In Reply to: RE: "Back-EMF" posted by pictureguy on July 21, 2010 at 13:32:22:
The kinetic energy of the driver and air motion is converted to an electrical current by the motion of the motor wires in the magnetic field. This current is driven through the total resistance of the speaker circuit, which includes the motor wire resistance (voice coil impedance in speakers with voice coils, typically four to eight ohms), the cable and connector resistance, and the virtual resistance of the amp's output impedance. In typical setups these days, the motor wire resistance is much larger than all the other resistances put together. Current passing through resistance dissipates energy.
As long as the speaker was designed for this situation, then you are correct that we want the lowest possible amplifier output impedance (highest damping factor) and low cabling resistance. However, speakers with strong motors may need more resistance than their wires contribute to achieve optimum damping. In the golden age of audio, high-efficiency drivers were designed to work best with the higher output impedances found in tube amps of the day. These drivers were over-damped by amps with low output impedance.
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Follow Ups
- Damping is the dissipation of energy. - Al Sekela 07/21/1015:31:23 07/21/10 (1)
- RE: Damping is the dissipation of energy. - pictureguy 16:55:51 07/21/10 (0)
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