Max Bitrate (resolution) of ATV2?

Discussion in 'Apple TV and Home Theater' started by Danny Boy, Mar 18, 2011.

  1. Danny Boy macrumors newbie

    Oct 9, 2009
    Hi everyone. Does anybody know what the maximum bit rates are for ATV2 audio? It's advertised as playing several formats, but many of those formats support multiple resolutions. I'm considering buying one for my stereo to stream music from my computer, but I have both standard (CD) resolution in apple lossless (16 bit, 44kHz) and some hi-res (24 bit, 96kHz and 24 bit 192kHz) music files too. I'm considering connecting an ATV2 to a Musical Fidelity M1 DAC by the optical connection. That DAC could handle the hi-res files if they could be streamed from the ATV2.

    Any better ideas for an audio streamer?
  2. pjarvi macrumors 65816


    Jan 11, 2006
    Round Lake, IL
  3. Danny Boy thread starter macrumors newbie

    Oct 9, 2009
    Thanks but...

    Thanks for the kind reply, but that didn't have the detail I needed. I really want to know if it will stream hi-res audio (more than 16 bit 44 kHz red-book).

    Anybody have more info?
  4. janstett macrumors 65816

    Jan 13, 2006
    Chester, NJ
    I remember reading when the ATV2 came out that it converts everything to 48/16 over SPDIF (the original changed rates based on source material). I'm curious to see what it does over HDMI so I'll do a test and post back here when I find out.
  5. Danny Boy thread starter macrumors newbie

    Oct 9, 2009

    Thanks for testing..I've searched the forums and the net. Can't find any specifics.
  6. NeverEnuf81 macrumors newbie

    Nov 15, 2007
    For the H264 videos, there isn't a defined maximum bitrate. I have 2 movies encoded at 18mbps and 14mbps respectively and they play fine (most are 4mb-6mb). It'll just eventually fail to keep up. It reads 1080p videos just plays them slowly.

    Surround music (DTS-A) has to be downcoverted to 48khz/24bit 640kbps AC3 to output through it.
    The ATV2 will output lossless/uncompressed music files at that same resolution. My receiver indicates that the 96/24 and 192/24 and 352.8/24 Nordic 2L files get sent to the receiver at 48/24bit.

    To appreciate 96/24, you need some serious audio gear and serious fanaticism though (have a friend play 96khz then 48khz...if you can't pick em out, you're wasting money). The kind of device that sends faithful 192khz+ signals to a receiver that knows what to do when them and speakers that can do it has an entry price of insanity — insanity also being the salient personality trait of an individual who can pick 192khz out of a lineup of 96khz music. :) Most of my friends can't even pick out a 2.8224mhz SACD.

    If you're that lunatic, I feel your pain. SACDs shouldn't have died out. They're amazing. The digital-download revolution and Best-Buy-surround-sound-in-a-box killed high fidelity. Good luck. Whatever garbage audio device they use in the ATV2, it couldn't process 96khz anyway. The PS3 does a moderate job of it, but completely fails to distinguish 192khz with any grace.

    (unless you have nearly 6 figures worth of speakers and amps, you can carefully downconvert 192khz to 48khz that are virtually it in 32bit resolution in Sountrack Pro or something...I got a few converted that just lost a tiny bit of staging and warmth on Krell gear driving Sonus Fabers)

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