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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: Maybe,. but what puzzles me is ..... posted by andyr on September 18, 2006 at 21:18:39:
Inductance represents energy storage in a magnetic field.Maggies are not very inductive and mostly resistive, considered as passive loads, but they are on Mylar panels in a listening room. The panels are light but have some mass. The air in the room also has mass, and the room defines acoustic boundaries which cause resonant modes. The speaker frame also has mass and some compliance, so there are at least three sets of resonances at work: the magnetic fields around the speaker wires, the panel and frame resonances, and the room air resonances.
All three represent stored energy that creates back-emf. The back-emf is greatly delayed in time from the original audio signal, and greatly filtered, but does present the amplifier with a tricky load.
This is why tube amps are ultimately unsuitable for Maggies, no matter how big they are. They simply cannot control this stew of resonances.
Maggies need the lowest output impedance obtainable.
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Follow Ups
- Back-emf comes from stored energy. - Al Sekela 20:41:11 09/21/06 (1)
- Thanks, Al ... makes sense!! - andyr 01:27:56 09/22/06 (0)
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