Hello Foghorn,
Hope you are well. I do not believe they would withstand being outside very well. Biggest problem I see is that they are covered with vinyl laminate, which I believe would peel off after extremes of temp and humidity. I don't know how the aluminum woofer and the titanium tweeter will react to outdoor conditions.
Axiom does offer more expensive high gloss finishes, which should be more weather resistant. I would talk to Axiom on the phone, and find out how the drivers would react to outdoor conditions, and how suitable the high gloss finish would hold up also.
Later,
TonyM
