Hi-Rez Highway

Posted by Charles Hansen (M) on July 19, 2007 at 19:39:30

In Reply to: RE: The scoop on SA-11 filters ("Red Book" CD)... posted by FidPup on July 19, 2007 at 09:40:59

The most interesting thing is that Filter One is a non-phase-linear filter. Look at the ringing -- there is more on the left side of the square waves than the right side of the square waves.

This is more like the way an analog filter behaves. With an analog filter, *all* of the ringing will be on the left side (after the transition) and *none* will be on the right side (prior to the transition).

It's interesting the the consensus of the posters seems to be that Filter One sounds the best, because for decades everybody has been hyping digital filters as "inherently superior" because they are phase-linear. But at least in this case, apparently not.

• Preference for Setting #1 - tlyyra 03:40:40 07/20/07 (0)
  In Reply to: RE: Thanks for posting the interesting photos posted by Charles Hansen on July 19, 2007 at 19:39:30

  As Marantz puts it:

  With RBCDs:
  "This is an original filter using short FIR with asymmetric preecho and postecho in the impulse response. The analog characteristics exhibit slow roll-off. This creates a sound venue with richness, smoothness, and depth consistent with the image of analog record performances."

  With DSD/SACD:
  "This is a direct mode that does not perform any filtering on the DSD data. The original source data is reprocuded without any alteration."

  Since this is primarily bought as an SACD player, I wonder whether it might be the latter that actually matters: no mingling whatsover with the DSD data. The other settings apparently have an attenuating effect on some segments of the bandwidth.

  I've been doing my RBCD listening with setting #3, thinking that I hear a greater overall "cleanliness" or clarity across the spectrum with it. Not a huge difference though and this decision is not very studied.

  TL
  
  

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  Edits: 07/20/07

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