AD1761 output attenuation

Hello everyone, thank you very much for understanding the novice Xiaobai's problem. The trouble here is to connect two DAC outputs, which are about 20db different from the frequency response characteristic curve of the original signal, and connect one DAC output, and the frequency response characteristic curve is different from the original signal. About 16db, why is it, and how to configure it so that the frequency response curve of the output and the input signal is consistent. I have been experimenting for a long time and still have not figured out this problem. The hardware road is also configured according to the manual, and no mixer is added. Why is the frequency response of the signal so different from the original signal?

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