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Charts 1 and 1A show the frequency response of the S1 with varying loads. The amount of switching carrier noise in mono mode prevented getting a good measurable response without the Audio Precision AUX-0025 external filter, so the filter was used in both cases to provide comparable responses for stereo and mono operation. There is a bit more noticeable deviation of high-frequency response in mono mode, but of more interest is the rise in the low-frequency response. Apparently, the designers felt this would give more weight to the S1’s low-end sound.