How comes most people agree that some brands like FiiO have a signature sound, a bit warmish in the case of FiiO for example of which I own a few?
It must be found exclusively in the built-in amps then? But many swear it's the DAC when it comes to DACs without extra OPAs.
I'm a noob with small portable DAC/amps but have plenty of experience with desktop DACs where I have found that the line stage makes the "sound", not the DAC chips. OPAs bad, discrete class A better and a good tube buffer (preferably with old or NOS tubes) the best.