![]() Therefore, big dips or fluctuations will show themselves in certain situations - for example: The ultrasonic image presents itself as "mirror frequencies" particularly of the high frequency content. Realize that the word "smooth" does not imply that the music is somehow "less grainy" or somehow more subjectively pleasant! It just means the suppression is more gentle rather than a "brick wall" or "cliff" as you can see with the curvature of the wideband white noise in the DFC graphs above.ĭuring music playback, the imaging doesn't necessarily look "smooth" at all. The "Smooth" filters will not remove all the imaging artifacts. To me this is a reasonable balance and sounds great :-). As discussed here and here, for filter tweakers, feel free to try "intermediate phase" filtering if you still want some pre-ring suppression using steep filters without as much phase shift. There are special instances when pre-ringing could affect the sound - like applying EQ (as per this example). Remember that I'm not saying that pre-ringing isn't ever present or completely inaudible. The Industry unfortunately neglected to tell audiophiles that with well mastered music, there is no "pre-ringing" during typical DAC playback! ![]() The phase shift will be more significant with a steeper filter like the "Precise" than the "Smooth" setting.Īs I discussed about a year back, IMO, the whole premise with minimum phase being somehow preferable by showing off impulse responses without "pre-ringing" is another one of these questionable claims sold to audiophiles when the Industry needed something "new" to use for marketing purposes somewhere around 2009. While the effect isn't massive, remember that this change is a given with minimum phase filtering. What's clear from the graph are the two minimum phase plots showing negative degree phase shifts as frequencies increase. Remember this is an actual measurement with a 48kHz sweep signal having gone through both the upsampling DSP, the Oppo DAC then analogue captured with the RME ADC 48kHz so please forgive the imperfection. Ideally, the two "Linear" filters should be perfectly flat. Quick and dirty using REW to check phase. The difference between linear and minimum phase can be demonstrated by the difference in phase response: It's in fact a steeper/faster filter than the Oppo's "Linear Phase Fast" setting. As expected, the "Precise" filters provide very good filtering with essentially no ultrasonic leakage.
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