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Rockbox mail archiveSubject: RE: Battery life as related to output volumeRE: Battery life as related to output volume
From: Fred Maxwell <rockbox_at_anti-spam.org>
Date: Sun, 14 Mar 2004 13:53:46 -0500 Jörg wrote: > Headphones need only little power to punch your eardrums, the difference > is not significant. I measured 77 mA with zero volume, 80 mA at full blast > (you would not want to have wear that), with a low-impedance headphone > (sortof the worst case). While impedance is a key factor, the other key to power consumption by headphones is their efficiency. If you have one headphone that's rated 92db/mw and another that's rated 101db/mw, the 92db/mw will take eight times the power to reach the same volume level. For every 3db decrease in efficiency, the power doubles. If you want to increase battery life, pay close attention to the efficiency of the headphones that you use. Also, with the undersized capacitors in the outputs of many of the Archos units, it's best to select a high-impedance headphone for optimal bass response. Regards, Fred Maxwell _______________________________________________ http://cool.haxx.se/mailman/listinfo/rockbox Received on 2004-03-14 Page template was last modified "Tue Sep 7 00:00:02 2021" The Rockbox Crew -- Privacy Policy |