Regarding the sound card, from the description it looks like the "crappy" sound card also employs a high-pass filter.
Is there a reason for it? What kind of circuit design in the DAC could cause low frequencies/significant distortion to require a high-pass at these frequency ranges?
Is there a reason for it? What kind of circuit design in the DAC could cause low frequencies/significant distortion to require a high-pass at these frequency ranges?
Genuine curiosity here.