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There really isn't much benefit to having double the speakers. There would be no gain in quality, unless m80's sound better at lower volumes for some reason (hence the combination of two at the same level would sound better). You could actually hinder some aspects of quality depending on placement. The amount of added spl would be minimal with only a 3 dB increase which is close to the threshold of a noticable difference in level. A doubling of sound pressure generates a 3 dB increase in level.
Cava, a modest correction: A 1-dB increase or decrease in SPL is the smallest (barely) detectable change in subjectively perceived loudness. A 3-dB increase is subjectively perceived by most listeners as "somewhat louder" (or "somewhat softer" if it's a 3-dB decrease in SPL).
Your other points I'd agree with.
Alan Lofft,
Axiom Resident Expert (Retired)
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