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Why do planars have poor bass extension?

I've been wondering about this. Is it because the excursion is limited because of the tension of the diaphragm & low BL limits its excursion?

On a related note, what techniques do companies like Magnepan use to get more bass out of their low-frequency drivers? Do they put bigger magnets in the grid than would be feasible for the midrange? Heavier diaphragms?

Finally if anyone knows a good reference for learning about the TS parameters of planars and if/how such calculations differ from dynamic speakers, that would be awesome!

Thanks all!
sideshowgabe

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sideshowgabe OP
2 posts
 
Thanks all! I'm particularly interested in the canceling effects inherent in the dipolar radiation pattern – could anyone point me to some more in-depth literature along the lines of Drew_eckhardt's response -

"Due to the energy lost into the acoustic short circuit between front and back surfaces in a domestically friendly 14.5" wide planer speaker or deep W/H frame you need 4X the displacement compared to a monopole and 12dB more raw output compared to the same speaker at 160Hz (so total excursion is 64X what it is at 160Hz)."

References are greatly appreciated!
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