Linear Acoustic UMPAX v4, Руководство пользователя

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Linear Acoustic UPMAX v4 User Guide Applications
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3.1.4 Music Applications
Upmixing stereo music stems is an excellent application of the UPMAX v4. In general, ei-
ther of the music presets can be chosen, with the only difference being that Music Full
spreads some of the upmixed center channel audio back into Left front and Right front.
The default Center Width of 33% was determined mathematically and verified by profes-
sional audio mixers who adjusted the width until they could just tell that audio was also
coming from Left front and Right front, then backed it down a notch. Good old science
proven out by practical experience!
If you desire a music mix that uses only some of the Center channel, a common practice,
try flipping the Center Width percentage: i.e. set it for 67%. This can leave a nice spot for
lead vocals or announce if they are available as isolated outputs.
Another control that is useful to try with music is the Dimension control which determines
how much of the upmixed Left front/Right Front audio to leak into Left surround and
Right surround. This has the effect of filling in the hole that can sometimes exist between
the front and rear channels - the audible result is similar to pushing the sides out a bit. Note
that it really does not take much to produce a decent effect, around 10% is good. Too
much can become problematic during certain downmixes so use with care.
3.2 Factory Presets
To get users up and running as quickly as possible, a few basic presets have been created
for different situations. The name of the game with this unit is “play.” There is no possible
way that presets appropriate for every situation could be generated, so we have included a
few to get you started. By all means, make adjustments, listen, store your new preset with
a name of your choice when you get it just right.
The UPMAX v4 ships with the following factory presets:
• Music Full - Straight two-channel to 5.1 channel upmixing, with the Center Width at
33%. This is very useful for programming that either contains dialogue with music or
is just mono dialogue as it nicely fills the front three channels, and feeds the surrounds
when appropriate.
• Music Narrow - Straight two-channel to 5.1 channel upmixing, but with the Center
channel kept discrete. Useful for film mixes and certain music mixes.
• Music Wide - Straight two-channel to 5.1 channel upmixing, but with the Center
Width spreading audio 67% to the Left front and Right front outputs and Center
Channel Detect set to Off. It appropriately fills the front three channels, and feeds the
surrounds when appropriate. Importantly, it upmixed content lower in the Center
channel leaving a “hole” with some music, perfect for announce audio or even an iso-
lated bus with lead vocals.