Okay I did these measurements a while back. Here's graphs of the FR of the various DSP options. Green is DIRECT MODE in all charts. Click on chart to make it larger.
Measurements performed on a Universal Hidition Viento using an IEC-60711 style coupler. GRAS RA0045 clone. Known resonance peak targeted around 8KHz.
DSEE HX
slight change in upper treble response.
DC Phase Linearizer
Bass A-B Standard measure the same and adds a small bass bump.
Type A and Type B LOW and HIGH also measure the same and does a sub-bass roll-off.
Vinyl Processor
It moves up and down in FR from the baseline throughout the audible range.
Measurements performed on a Universal Hidition Viento using an IEC-60711 style coupler. GRAS RA0045 clone. Known resonance peak targeted around 8KHz.
DSEE HX
slight change in upper treble response.
DC Phase Linearizer
Bass A-B Standard measure the same and adds a small bass bump.
Type A and Type B LOW and HIGH also measure the same and does a sub-bass roll-off.
Vinyl Processor
It moves up and down in FR from the baseline throughout the audible range.