Single box CD players with NO oversampling?

Frank Van Alstine claims that his "OmegaStar" DAC uses 4x oversampling. Does this mean he is in the same camp as ARC, Audio Note, 47 Labs etc (no oversampling)? this is very confusing. thanks

6chac - thanks for your response. Audio Note claims "1x-oversampling" (and NO digital filtering). Is their claim not correct ? thanks -

6chac - thanks for your response. Audio Note claims "1x-oversampling" (and NO digital filtering). Is their claim not correct ? thanks -

Jc, Zikesman - If you read the Audio Note web site carefully (the section on DACs), it says clearly that no DIGITAL filtering is used. But if you look at the comparison tables, it does make mention of ANALOG filters. It just does not describe the characteristics of the analog filter. My difficulty in understanding all of this is as follows: no oversampling means 44.1 kHz, and that means aliasing components down to 22.05kHz. Filtering this out EFFECTIVELY implies a BRICK WALL filter. Audio Note claims some proprietary filtering. If it's not brick wall, then it doesn't filter out (effectively)the aliasing conponents that are JUST ABOVE the audio band.

6chac - Regarding 4x oversampling: Maybe the companies that claim "No oversampling" really mean "no more than 4x oversampling".

6chac - Regarding 4x oversampling: Maybe the companies that claim "No oversampling" really mean "no more than 4x oversampling".

There's more: looking at the web sites implies that 47 Labs Progression does NO filtering AT ALL, while Zanden does no digital filtering but DOES DO Analog filtering.

Here is the 47 labs website: http://www.geocities.com/rjm003.geo/rjmaudio/diy_dac.html