I'll use a psu based on LM317/LM337, that ensure less noise

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Thanks for reply. The real problem is if all hum and noise can canceled. This problem don't present using a 12V lead acid battery whit rail splitter and buffer. I think to use this regulated power supply:http://www.circuitdiagram.org/images/9v-dual-power-supply-circuit.gif

Hi for all. About A47 headphone amplifier, the best solution is a regulated (or unregulated?) power supply 0-24V with rail splitter and buffer, or a dual power supply (or unregulated?) -15V/0V/+15V without anything else?