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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: Yet another problem room.. posted by mmlrot1 on March 6, 2012 at 06:15:11:
OK, it's one of Graz's. He uses neodynium magnets to get that efficiency. Unfortunately, neodynium is extremely expensive right now, because the Chinese drove all the other rare earth mines out of business and once they had a monopoly, put export limitations on it to force rare-earth-dependent businesses to move their production to China. New mines are about to come online, but for the next few years anyway it will stay pricey -- I've seen figures like $3000 for a high-eff 2" Apogee-style woofer. So most manufacturers are using it only on smaller drives, e.g., small quasi-ribbon driers like the BG's. There, you need high efficiency, because there isn't much heat radiating surface so you want to limit current, and it's also desirable to keep magnets out of the path of the high frequency audio to minimize diffraction and cavity resonances.
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- RE: Yet another problem room.. - josh358 15:01:36 03/06/12 (0)
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