od utkva » úte 08. úno 2011 10:02:01
To Jose : Nejsou fáze v monitorových cestách otočeny záměrně?
V ideálním případě je vhodné mít přepínač fází na monitorových cestách a při zvukovce, nebo při vazbě během koncertu to použít, nebo zkusit na odstranění vazby. Dle zdroje níže je to jedna z metod při potlačování vazby na pódiu. Já jsem to zatím nezkoušel. Používáte tuhle metodu někdo? Nebo na akcích s monitor mixem?
Zdroj: The sound reinforcement handbook - yamaha handbook Gary Davis & Ralplh Jones
(Phase)Reversal as a Tool to Fight Feedback
It is a common practice to ring out the monitor system before the performance. Ringing out is a method of tuning the equalization of each monitor channel to suppress resonances in the stage/monitor speaker system. The actual point at which feedback begins will change when performers are on stage, as mics are actually in use, and even with small changes in temperature and humidity (which can drastically affect the stage acoustics).
While graphic or parametric equalization is of greatvalue in reducing feedback, so is the simple technique of reversing the polarity of a particular monitor console output. Unlike a main house mixing console, where various busses may be combined, or where the sound image from multiple speaker channels relies upon a specific phase (polarity) relationship between the channels, monitor mixes are each unique and are not intended to blend or overlap much. The absolute polarity of a sound has a lot to do with the point at which feedback occurs, and flipping that polarity can provide increased gain before feedback. Therefore, it is desirable to have polarity (or phase) reversal switches on each monitor console output. If these are not provided, then polarity reversing adaptors can be plugged into the output channels as required. It is still a good idea to have polarity reversing switches on each input, too, since multiple mic inputs are often blended onto a single bus, and these electrical signals (when they carry portions of the same sound source) must have the proper phase relationship in order to add constructively.
[b]To Jose : Nejsou fáze v monitorových cestách otočeny záměrně?[/b]
V ideálním případě je vhodné mít přepínač fází na monitorových cestách a při zvukovce, nebo při vazbě během koncertu to použít, nebo zkusit na odstranění vazby. Dle zdroje níže je to jedna z metod při potlačování vazby na pódiu. Já jsem to zatím nezkoušel. Používáte tuhle metodu někdo? Nebo na akcích s monitor mixem?
[i]Zdroj: The sound reinforcement handbook - yamaha handbook Gary Davis & Ralplh Jones
(Phase)Reversal as a Tool to Fight Feedback
It is a common practice to ring out the monitor system before the performance. Ringing out is a method of tuning the equalization of each monitor channel to suppress resonances in the stage/monitor speaker system. The actual point at which feedback begins will change when performers are on stage, as mics are actually in use, and even with small changes in temperature and humidity (which can drastically affect the stage acoustics).
While graphic or parametric equalization is of greatvalue in reducing feedback, so is the simple technique of reversing the polarity of a particular monitor console output. Unlike a main house mixing console, where various busses may be combined, or where the sound image from multiple speaker channels relies upon a specific phase (polarity) relationship between the channels, monitor mixes are each unique and are not intended to blend or overlap much. The absolute polarity of a sound has a lot to do with the point at which feedback occurs, and flipping that polarity can provide increased gain before feedback. Therefore, it is desirable to have polarity (or phase) reversal switches on each monitor console output. If these are not provided, then polarity reversing adaptors can be plugged into the output channels as required. It is still a good idea to have polarity reversing switches on each input, too, since multiple mic inputs are often blended onto a single bus, and these electrical signals (when they carry portions of the same sound source) must have the proper phase relationship in order to add constructively.[/i]
