Qudelix 5K User Manual page 12

UNBALANCED (Single-Ended) 3.5mm
Works with Single ES9218p
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Max. 2V RMS output
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3-Wire Output from Source Device
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2 ch DAC/AMP for Stereo Audio
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1-pin Ground
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Common Ground
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Ground Pin goes to both Speaker-L and Speaker-R
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Ground ripple(noise) affects both L & R channel
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Both AMP_NOISE and GROUND_NOISE affects the Sound Quality
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VL = L + AMP_NOISE + GROUND_NOISE
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VR = R + AMP_NOISE + GROUND_NOISE
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L
Ground
R
VL
VR