Fixed-point output show sharp spectral cut off in test test_param_file_tests[stv-SBA at 48 kbps, 32kHz in, 32kHz out, BINAURAL ROOM IR out, HR, OT, exo]

Following is the spectrum plot of the channel 1 of the fixed-point and the floating-point outputs between 4-4.5s It's observed that the fixed-point output cut off sharply above somewhere around 5.5kHz.

The same sharp cut off was observed with signal scales 0.3162, 1, and 3.162.

There was also a 5dB signal loss at around 1.5kHz.