96K audio output brighter than lower bitrates?

Discussion in 'Mac Pro' started by Escher2112, Jun 3, 2014.

  1. Escher2112 macrumors member

    Jul 25, 2011
    If you are a member over at AudioKarma then this will be a repost - sorry... but I'm stumped:

    Just FYI - Here is my signal chain:

    MacPro (2008) --optical --> DEQ2496 --coax--> DAC--analog--> Carver C1 --> Carver TFM25 --> MGII

    So - when I play flac files, in any application... and I switch from 44.1K to 96K in audio/midi setup, its like someone *cranked* the treble knob... Its a lot brighter at 96K.

    Source files have been 44.1 and 48K.. so the Mac is upsampling to 96k..

    My DAC is a 24/192 diy kit I got of the 'bay a few years ago its got decent specs for the D/A (PCM1798)...


    I'm running 10.9...
  2. psycho bob macrumors 6502a

    psycho bob

    Oct 25, 2003
    Leeds, England
    As silly as this may sound, what makes you think the mac is up sampling to 96KHz? Just because the output has altered to that setting I would be more inclined to think it is outputting in the original format with a lot of headroom or doing something screwy and actually shifting frequencies.

    Up sampling is a specific function and in terms of hardware I doubt any mac supports it natively. As such you would be best off sticking to the native format and looking at sampling and converting in a single device. I don't know the specs for the audio boards in your mac but I suspect it is digital out only without conversion. Maybe software solutions exist.

    As for why it sounds brighter I know not but it would indicate that something is amiss.
  3. Escher2112 thread starter macrumors member

    Jul 25, 2011
    very interesting... I hadnt thought of that.

    It is just the factory Mac Pro Digital output that I'm using...

Share This Page