Emotiva Differential Reference XDA-3 User Manual page 25

XDA-3
User-Selectable Oversampling Filters (DAC):
• Filter #1: Linear Phase Fast Roll-Off.
• Filter #2: Linear Phase Slow Roll-Off.
• Filter #3: Minimum Phase Fast Roll-Off.
• Filter #4: Minimum Phase Slow Roll-Off.
• Filter #5: Apodizing Fast Roll-Off.
• Filter #6: Hybrid Fast Roll-Off.
• Filter #7: Brick Wall.
The graphs on the next page show the typical impulse response and frequency response of the
various filter options. (The frequency response plots correspond to an input sample rate of 44.1k
or 48k. The roll-off frequencies will be higher at higher sample rates.)
Note that most of the filters deliver a flat frequency response in the audible spectrum. The
major differences between the frequency responses of the various filters occur outside the
audible frequency range, and at extremely low signal levels, and contribute little to the audible
differences between the filters. The audible differences between the filters are mainly due to the
amount and type of pre-ringing and post-ringing that result as musical transients are processed
by the different filters - and can be quite subtle. In many cases you will find that specific high
quality recordings will sound "more natural" or "more real" when you select one particular filter
option.
Since the ideal filter option is both a matter of personal preference, and of the specific content
you are listening to, we have provided a button that allows you to cycle through the various
options right on the remote control. Press the Filters Button once to display the current filter; and
press it multiple times to cycle through the available filter options.
Differential Reference
Page 21
DAC