Superlux HA3D - Manual (Page 5)

Front Panel
1. Stereo/Mono Switch
Sums stereo and 2 channels audio Program to mono for mono, or single muff headphone monitoring.
2. Headphone Gain
Controls Volume of each headphone output.
3 . Headphone Peak LED
Illuminates 3 dB before clipping to indicate onset of headphone distortion.
4. POWER LED
Bi-color LED illuminates green when the unit is powered and changes to red when approximately 4 hours of battery life
remain.
5. POWER Switch
Powers the unit from either Internal batteries, or External DC. Seamless switchover from each power source.
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