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1.Built-in two channel 2nd order high pass filter
2.Two independent DC voltage volume controller:
- Main volume control: Left/Right channel is synchronize controlled, totally 32 steps, control range 0~-80dB
- Low pass channel output levelTotally 32 steps, control range: 0~-80dB
3.Built-in stereo mixed mono 2nd order low pass filter for subwoofer
4.Included loudness compensate and ALC
5.Crossover frequency is decided by external passive components
6.Volume control and amplitude limiting by DC voltage, does not need MCU.
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