Different how? There shouldn't be any difference in the shape of the response unless a gain setting is pushing the signal into clipping. The SPL at which the response is drawn will change if the input gain is altered without repeating SPL calibration.Everything worked out, thank you!!! But there is another point: how to adjust the signal level: the input channel amplifier and adjust the monitor amplifier or vice versa, adjust the monitor amplifier, and adjust the input amplification of the channel. The measurement results in these cases are different!