outdoor atriums

[eaadams]

I dont understand this from the product page:
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Unique Dual Input/Single Input Feature: A rear mounted switch allows the Atrium 65SDI to operate as a single, dual-input speaker for stereo applications, or a traditional single-input speaker for left or right use.
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could someone explain this feature to me in plain english? Is not traditional left / right use the same as stereo applications?

[bknauss]

The single option gives you a somewhat stereo effect out of one Atrium via the two tweeters. When you do the dual option, its a regular stereo pair, left and right, yada yada yada...

[nadams]

The above is correct. It's so you can run one speaker off of a stereo (L-R) signal. It's there so that you don't lose channel-specific sound if you only have a need for one speaker outside.

[eaadams]

does the dual option only use one tweeter?