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TAS5733L: During the test of TAS5733L/TAS5751M, we found that the high frequency signal part of TAS5733L/TAS5751M has a certain attenuation.

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Part Number: TAS5733L
Other Parts Discussed in Thread: TAS5751M,
During the test of TAS5733L/TAS5751M, we found that the high frequency signal part of TAS5733L/TAS5751M has a certain attenuation.
That is, after 10KHz, the output amplitude of the signal decreases gradually.           
Testing on TI's official development board TAS5751MEV, using PPC3 tool, testing Mono output, turning Equalizer off, using 4ohm false load:           
1.0dB 200Hz single-ended Vrms = 1.55V           
2.0dB 1KHz single-ended Vrms = 1.56V           
3.0dB 10KHz single-ended Vrms = 1.58V           
4.0dB 15KHz single-ended Vrms = 1.49V           
5.0dB 17KHz single-ended Vrms = 1.41V           
6.0dB 20KHz single-ended Vrms = 1.32V
As shown in the following figure:
That is to say, similar phenomena can be seen on TI's official development board.
What is the reason for this phenomenon? Is there a way to keep the high frequency output from decaying?
The schematic diagram of TAS5751M EVM development board:
TAS5751M EVM development board physical diagram: