I built a sine sweep utility to test some plug-ins for aliasing and distortion and noticed a “buglet”. The amplitude of sine waves with a frequency less than about 100 Hz is less than full-amplitude. The amplitude ramps up from 20 Hz to about 100 Hz and then is dead even. There is a about a 6 db ramp from the amplitude at 20 Hz to when it reaches full amplitude.
I am not sure what the exact frequency is where it reaches full amplitude.
@taylor: is this a known thing.
Is it expected?