Are you sure it isn’t your DAC being overdriven by the dynamic-range of a 32 bit signal? Managing your gain structure is important …
Theoretical maximum of LPCM encoding:
6 (dB) x (number of bits) + 1.75dBv = Dynamic-Range of LPCM…
6 x 24 + 1.75 = 145.75 dBv
6 x 32 + 1.75 = 193.75 dbv
Not realistic for even the best DACs… So managing gain structure is critical in eliminating digital overload clipping of any given DAC architecture.
Also if your DAC is not capable of 32 bit reproduction, it may be truncating the 32 bit signal to 24 bit and introducing some distortion due to round-off error…
