Sennheiser HE 1 User Manual page 23

Putting the HE 1 into operation | Using the tube headphone amplifier connected to a Mac/PC
Open the Control Panel and select "Sound".
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The "Sound" window opens.
Select "HE 1" as the default audio output device.
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Click on "Properties" and, in the "Advanced" tab, select the maximum
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sample rate from the "Default Format" drop-down list. Select "32 bit,
192000 Hz (studio quality)" for the best possible sound quality.
Click on "OK" to apply the settings.
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