Most of those professional noise-canceling headsets were designed for powered systems. The noise canceling feature required a powered amplifier in the headsets. The impedance is going to be all wrong (high resistance). That's why the jack is so big. Impractical to convert without a special box.
The military version I used required 24 volts input in prop planes and 48 volts in the jets. My civilian headset required 12 volts. Anyway, those big things always seemed to hot and too heavy for for home use.
Bose and Sony make excellent noise canceling headsets that are battery powered and light weight. Naztech.com has some for $130 (no microphone).
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