iBasso DX220 - Notch Filter; High Shelf Filter

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6. Notch Filter
The central frequency has obvious reduction. The frequency beside
the central frequency has similar effect. Gain setting is ineffective
with notch filter.
7. High Shelf Filter
There is a wide effect on the frequency that is higher than the
central frequency.
2 3 4 56 10 20 30 100 200 1k
⑩. Q=0.7071 ⑪. Q=20
4 5 6 78 9 10 20 30 40 50 100 200
300 1k
⑫. Q=0.7071 ⑬. Q=20
4 5 6 78 9 10 20 30 40 50 100 200
300 1k
2 3 4 56 10 20 30 100 200 1k