It's 5-pin balanced connector with shared ground that is used in Stax amps. Every amp is designed for a specific load(impedance). I would doubt that impedance of electrostatic headphones is in the single digits(aka ideal for iPod)
WOW, Thanks all, The Stax connector is the same as 5-pin stereo-balanced connector with "slight" difference:-) I've seen some balanced headphone amps with the same 5-pin connector
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