Low-frequency shaking sound when the backlight is disabled

Very starnge.  It only happens for some MP3 song, and when the backlight turns off, I hear that very clearly some low-frequency (about 3-4 Hz) sound poping out.  Once I press a button and the backlight was on, pop vanish.

Yes, after changing the EQ for 'Rock' to 'Normal', the problem is resolved.  I don't even have to use "custom" for the equalizer.  This problem makes me very carefully listern for the background music/noise.

Tags: SanDisk Sansa

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