Emotiva Differential Reference XDA-3 - Page 25

Page 21
XDA-3 Differential Reference DAC
User-Selectable Oversampling Filters (DAC):
• Filter #1: Linear Phase Fast Roll-O.
• Filter #2: Linear Phase Slow Roll-O.
• Filter #3: Minimum Phase Fast Roll-O.
• Filter #4: Minimum Phase Slow Roll-O.
• Filter #5: Apodizing Fast Roll-O.
• Filter #6: Hybrid Fast Roll-O.
• Filter #7: Brick Wall.
The graphs on the next page show the typical impulse response and frequency response of the
various lter options. (The frequency response plots correspond to an input sample rate of 44.1k
or 48k. The roll-o frequencies will be higher at higher sample rates.)
Note that most of the lters deliver a at frequency response in the audible spectrum. The
major dierences between the frequency responses of the various lters occur outside the
audible frequency range, and at extremely low signal levels, and contribute little to the audible
dierences between the lters. The audible dierences between the lters are mainly due to the
amount and type of pre-ringing and post-ringing that result as musical transients are processed
by the dierent lters - and can be quite subtle. In many cases you will nd that specic high
quality recordings will sound “more natural” or “more real” when you select one particular lter
option.
Since the ideal lter option is both a matter of personal preference, and of the specic 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 lter; and
press it multiple times to cycle through the available lter options.