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The phase shift measurements were conducted with a USB oscilloscope for the frequency range of 10,000 to 40,000 Hz, using 10,000 Hz intervals, for both cases, with and without the high-pass filter.
| Frequency interval [Hz] | High-pass filter deactivated [deg.] | High-pass filter activated [deg.] |
|---|---|---|
| 10,000 | 14.40 | −114.76 |
| 20,000 | 34.62 | −36.00 |
| 30,000 | 55.64 | 11.65 |
| 40,000 | 77.56 | 47.52 |
