You might not need your input opamp. Texas Instruments has a page full of low noise audio opamps.For example, which opamp?
It is the wires in and feeding the amplifier, not the headset that picks up hum. A wire carrying a low level signal needs a shielded audio cable to block hum pickup.There is no hum when connecting this headset to other industrial equipment. It's not about the cable.
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by Jake Hertz