1) FILTER：
The AH90 uses 6 types of AKM's built-in high-performance PCM filters:
SHARP Sharp Roll-off (Default)
SLOW Slow Roll-off
SD SHARP Short Delay Sharp Roll-off
SD SLOW Short Delay Slow Roll-off
SUPER SLOW Super Slow Roll-off (NOS-like)
LOW-D SHORT Low Dispersion Short Delay Filter
2) AMP GAIN:
The amplifier features two gain options.
LOW Low Gain, Output Voltage = DAC Voltage (Default)
HIGH High Gain, +6dB
3) OUTPUT:
Output configuration
AUTO (Default)
HP ONLY Headphone only
LINE ONLY Line-out only
When set to AUTO, once any headphone is plugged in, it will automatically disconnect the
internal output, and turn on the output when no headphones are plugged in. And the volume is
automatically lowered to 30 when switching automatically to avoid excessive volume.
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