iBasso DX220 - High Pass Filter; All Pass Filter

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2. High Pass Filter
The frequency smaller than the central frequency will be affected.
Gain setting is ineffective with high pass filter.
3. All Pass Filte
There is no effect beside the central frequency. Gain setting is
ineffective with all pass filter.
③. Q=0.7071 ④. Q=20
2 3 4 56 10 20 30 100 200 1k
4 5 6 78 9 10 20 30 40 50 100 200 300 1k
⑤.
2 3 4 56 10 20 30 100 200 1k