Joe Bloggs
Sponsor: HiByMember of the Trade: EFO Technologies Co, YanYin TechnologyHis Porta Corda walked the Green Mile
@Joe Bloggs (or anyone who knows) - you last mentioned that the R3 slow descent/sharp drop filters are linear type, so "Linear phase filters (i.e. the ones not labelled "short delay"): you believe preserving the phase relationships of instrumental sounds up to the highest frequencies is beneficial to correct soundstage reconstruction." Can you share the difference when the linear filter is "slow descent" vs "sharp drop"? Is sharp drop the "default" filter on most DAPs?
The rationale for using each filter may be as follows:
Sharp rolloff: your high frequency hearing doesn't go up to the Nyquist frequency (22050Hz in the case of 44.1kHz sample rate) so you choose to use a sharp rolloff filter. This way you get flat response up to the limits of your hearing and no audible ringing (only inaudible ringing at 20000-22050Hz)
Slow (or super slow) rolloff: your high frequency hearing does go up to and above 20000Hz so much that you do hear ringing at those frequencies; besides, modern pop music is mastered too brightly for your tastes. You kill two birds with one stone, the slow rolloff filter: it makes ringing less noticeable and the highest frequencies less prominent.
I believe that the choice only applies in the case of 44.1kHz or 48kHz playback and there's no reason not to use a slow rolloff filter (that starts at higher ultrasonic frequencies instead of 20kHz) for hi-res content, to eliminate ringing and preserve FR across the audible spectrum at the same time.
Stay updated on HiBy at their facebook, website or email (icons below).
Stay updated on HiBy at their sponsor profile on Head-Fi.
|