The "ZEN" topology will enable very easy the adjust of the wanted idle current by variation from only one resistor in the associated CCS. According your headphone impedance (mostly above 8 ohms) you must choice the right value.
By the image from URL
http://cygnus.ipal.org/mirror/www.passlabs.com/images/zen_amp2.jpg
it is R1
By the image from URL
http://cygnus.ipal.org/mirror/www.passlabs.com/images/zen_amp2.jpg
it is R1
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