HELP Mac mini + Rew no multichannel output

Discussion in 'Official REW (Room EQ Wizard) Support Forum' started by davidmv, May 16, 2018 at 4:18 AM.

  1. davidmv

    davidmv New Member
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    Hello everyone,

    I am new to this forum, although I have used REW in the past. Before I start, I have used the search function both in this forum, and AVSForum, but have not found the cause/solution to my problem. I have tried almost every single tutorial I've found, but if someone can put me in the right direction I would appreciate that.

    My setup is as follows:

    Mac mini late 2012 i7 12GB Ram
    osX High Sierra 10.13.4
    REW 5.19 beta 9
    The installed Java version is 8.171 (1.8.0_171-b11)
    UMIK-1

    This is connected (for measurement purposes) to an Emotiva UMC-200 or (I've tried both) to an HDMI switch. Both (the Emotiva and the switch) route the video signal to a projector (as the mini does not have a screen), so I have to use the same output.

    In the past I made the measurements switching cables, but my setup is very inaccessible and I wanted to be able the measure and adjust all the channels in an easier manner.

    The problem I find is that REW does not recognize any more than 2 HDMI channels (when connected to the switch) and, when directly connected to the UMC, no HDMI audio output. Strangely enough, if I launch VLC player, it does give me the option to choose "raw HDMI" audio device, which outputted (in my test) a True HD DTS signal that was immediately recognized and decoded by the preamp.

    I have run now out of ideas so any helo will be greatly appreciated.

    Cheers,
     
  2. John Mulcahy

    John Mulcahy REW Author

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  3. davidmv

    davidmv New Member
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    Thanks John, I've tried but to no avail. It only shows 2 channels (if it appears). I really don't know how to proceed.
     
  4. EarlK

    EarlK Member

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    You need to see this within the ( Mac's ) Audio Midi control panel ( & set it as your computers preferred output by hitting the "Configure Speakers" button );

    [​IMG]

    OTOH, if ( Apple's ) Audio Midi control panel is only displaying 2 channels ( as an available output choice ) then the fault lies with your HDMI switch ( telling the computer that only 2 channels are available/needed for output ).

    Reset the switch ( ie; restore all HDMI Handshakes ).

    HDMI Power-up Sequence

    :)
     
    #4 EarlK, May 17, 2018 at 1:33 PM
    Last edited: May 17, 2018 at 2:07 PM
  5. John Mulcahy

    John Mulcahy REW Author

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    Also if connecting to the UMC make sure it is in a processing mode that accepts multichannel linear PCM.
     

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