Originally Posted by Asa Post
It is just at variance from what I have been told i.e. upsampling / resolution enhancement / apoodising take place for standard resolution inputs whether analogue or digital. I had recently had this confirmed by two different Meridian dealers pursuing two different lines of enquiry. Yesterday, I had this confirmed by a senior Meridian employee face-to-face.
Asa
I don't want this to overly prolong this but............

No questions asked, Apodizing is applied and is of benefit on all 16/44; 16:48; and 24/48 Digital Sources

As regards Analog sources, (and as as Ian says above), "High Res" or "Low Res" or "Resolution" is a term that is not typically applied to Analog Sources. Likewise, Apodizing or Upsampling is not something that can be applied to Analog sources, at least until they have first been converted to a Digital Data Stream

The Analog Card on the 808.2 or 3 and the 861 will take the Analog Source and immediately convert it to Digital 24/96 on the Input Card itself.

Once the Data Stream is in a 24/96 format, will that Stream have the Apodizing / Upsampling filter applied??? Rather than give you my interpretation, better to take Bob's own interpretation from the CES Q&A 2009

Originally Posted by Bob Stuart - CES 2009
Apodizing filters on hires material / sources (i.e. are they of value)?

While they do have some value, they are nowhere near as critical at 2x and higher as they are at 1x. This is due to the fact that the ringing frequency (caused by the filter transition) is definitely supersonic at 2x and above , normally above tweeter response and the pre-echo is shorter.


Now Asa, in no way am I trying to denigrate the way that the Meridian 808.x or 861 deals with Analog sources. They are converted to Digital 24/96 using Meridian's very transparent ADC Process. Then all Processing is carried out in the Digital domain at High Res, which is obviously a very good thing

All I'm saying is that the main benefit of Apodizing is generally recognized as being the minimization of pre-ringing caused by the steep "brick wall" filters used on 41khz and 48khz material. Because Meridian's 24/96 ADC process does not employ such brick wall filters, applying the Apodizing filter to the 24/96 converted Analog source will be of limited value at best

Just to re-emphasize, I do not regard this as a Negative in any way

Let me try and say this another way. I have about 400 discs with native 24/96 High Res material. I plan on passing this into an 808.3 or 861v6 thru their Digital Inputs.

For the EXACT same reasons as above, I do not believe that the Apodizing filter will Add or Subtract anything from this 24/96 material. It's quite possible (even likely??) that some other 808 or 861 changes will add value (I hope), but Apodizing itself will of limited value on this material

Last edited by Ronnie Hurley; 2010-03-01 03:04.
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