Note the total absence of any sound card response error. When loaded by the input impedance of the sound card the series capacitor forms a high pass filter with -3 dB frequency at around Hz. Found missing kidīelow is a Quick Sweep measurement of a high pass filter created by inserting a pF capacitor in the test loop. The response of any system you now insert in the test loop can now be measured very precisely plus or minus. Note that the response of the sound card has been removed from the measurement so that a self test of the sound card now shows a flat response. Here are the components that make up TrueRTA.
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