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  • Monocompatibility


    I use vsl with MIRx "Großer Saal".
    With the help of the mid/side EQ I want to take away 1-2 dB of two or three small frequency bands in the mid to add these 1-2 dB complementarily on the side. This will happen in the Orchestra sum bus which is then routed to Stereo Out.

    If I press MONO in the Stereo-Out I only hear the MID signal but not the frequency bands I "routed" to SIDE.

    In my opinion the Software MONO-switch in my Stereo-Out bus is not a proof of monocompatibility, which should be MID+SIDE=L+R channel.

    I hope I made clear what I intend to say...

    Best regards,Adorno


  • Hi Adorno,

    Technically it doesn't make any difference whether you sum your L+R channels for mono repreduction, or you extract the M-component by means of an M/S-matrix. Summing M and S signals derived from the outputs of an M/S-encoder is _not_ what audio engineers call mono, usually. :-)

    Does this answer your question?

    Kind regards,

    /Dietz - Vienna Symphonic Library
  • Hi Dietz,

    thank you for your fast reply.
    This means that the frequency bands I reduced in the mid will also be reduced in the Stereo Out which is set to MONO. Like this:

    STEREO: MID+SIDE or left + right
    MONO: MID+SIDE or (left+right)/2

    So I have to come to the conclusion, due to the loss of signal I routed to Side, to ensure monocompatibility I should not route frequencies to the side although it sounds better in Stereo?

    Best regards,

  • As soon as you sum L+R, every signal component that is out-of-phase (i.e. "stereo") will get wiped-out. But there can be other components with less out-of-phase (read: more "mono") content in a neighbouring frequency range which are still affected by the M/S-EQ you apply, therefore the sound of the mono downmix will change, too.

    Bottom line: There is no perfect L+R summing of a stereo signal, because otherwise the source would have to be free of out-of-phase information from the very beginning. So the decision is up to you, in the end: Either beautiful stereo and (maybe) less mono-compatibility, or good mono and boring stereo reproduction. :-)


    /Dietz - Vienna Symphonic Library