Dual Mono

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Dual Mono

This is amplifying the same sound source through two separate loudspeakers. 

Hilmar-at-Bose wrote:

Dual mono is usually not a good idea, if you have more than one performer. With more than one performer/source it's in my opinion always preferable to separate the sources (i.e. one source per L1). The spatial separation and precise localization helps more with clarity much more than the added gain.
For a single performer/single source it's not quite so clear cut. One will be more accurate (i.e. sound is clearly located at performer's position, more consistent spectrum) and two will sound wider and more spacious. In the end, that is an artistic decision, depending on which one is closer to your artistic intent.
-- Source Dual mono is usually not a good idea

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