I posted the below reply on another forum. I didn't buy a vineyard but I visited a tasting room for a release yesterday and they had the Model 6.5 installed outside as well as a subwoofer. They have been out in extreme elements for many years and sounded very good.
I had looked at Ambisonic Systems at one point but determined we didn't spend enough time playing music outside and these are much higher priced than most outdoor speakers. More in the commercial class. They look very nice though. I considered the landscape posts with speakers and a subwoofer hidden in the garden and pointing towards the house so the sound didn't carry over the lake and down the valley as much. Maybe when I buy a vineyard and have a release party.