Originally Posted by blitzxgene
The digital stopband seems to control the amount of treble energy coming through more or less. Setting to -90 gives the system a smoother and warmer sound. The dithering setting is affects 16 bit music by attempting to pad it to 24 bit (or so I am led to believe). However, it removes a fair amount of detail from 16 bit music and I prefer to hear all the little things.
With dithering off and the passband set to the stock -130, music is analytical. With the dithering off and the passband at -90, music is warmer and more musical while still retaining great detail.
Yes, stopband allows signal energy to "escape". Lower stopband -> less energy in audio range -> lower dynamics.
Dithering effects are more difficult to apprehend correctly and good quality recording with very resolving headphone is required to hear dithering benefits. No dithering can seem
more detailed because all instruments and voices are more pronounced and in your face
. That is good, but you lose micro details, precise positioning and depth of the stage. The resulting "no dithering" sound is more left-right oriented with instrument and voices "fighting" each other because all their respective loudness seems the same (or very close).
So sure - DSP-1 switches are there for "tailoring" somewhat the PCM1704 sound to owner's likings. If you prefer "softer", less dynamic "equalized" sound - lowering the passband attenuation and turning of dithering is the way to go. But from my experience - KingWa's original DSP-1 settings were/are the ones that sound best (or at least the ones that I always return to).