Hi,
I don’t have the graphs handy but I did a loopback between the inputs and outputs and used a program called Room EQ Wizard (REW) to create a calibration file. This effectively measures across the entire available frequency range available at the sampling rate you are using. Using ASIO at 48khz I got -1db at 20hz, -1.5 at 20khz. At 196khz I got -1.5db at 20hz and -1db at 20khz then a gradual roll-off to be about -3db at 50khz then a sharper roll-off above this frequency . I will leave it to you to decide whether you consider this to sufficient for your requirements.