Sorry my last post was the wrong way round. Your chopping frequency appears to be in the sonic region when it should be ultrasonic. A lower supply voltage or a higher motor voltage make it lower as the on time needs to be longer and off time is fixed. Also higher current will make the frequency lower. I only use 1.25A with the same type of motors.
I use A4988 with ROSC shorted. Shorting ROSC does make the idle noisier but it should make running a bit quieter if anything. I don't think I have tried A4982 but I can't see any reason why it would be noisier than A4988 in low current micro stepping mode. Are you comparing it with A4988 with ROSC not shorted perhaps?
The Y axis is always noisier than X because the base and carriage act as sounding boards.
I use A4988 with ROSC shorted. Shorting ROSC does make the idle noisier but it should make running a bit quieter if anything. I don't think I have tried A4982 but I can't see any reason why it would be noisier than A4988 in low current micro stepping mode. Are you comparing it with A4988 with ROSC not shorted perhaps?
The Y axis is always noisier than X because the base and carriage act as sounding boards.