I mean for all intended purpose horns has restricted radiation pattern and usually larger size then direct radiators. I do not see any needs to use horns for private outdoor installation. In our house we have a lot of outdoorsy live and I did think about some kind out acoustic system outside. Eventually the issues was “magically” resolved by Amy’s introducing me to Bose SoundDock. I have mentioned it before:
I would like to note that sound that the Bose SoundDock produce is nowhere near anything that might be respected, in fact it is horrendously interesting as it make music in the way non-recognizable. Still, the comfort that a portable little radio has that you might take anywhere, the has very long battery, unlimited playlist including all FM stations, and ability to play loud without overload I find truly wonderful.
In addition if you have some kind of all whether system connected to your mine playback then you need to run your main playback when you are in the garden. Do you really want to do it? It is much easier in my view to flip the selector on your local devise and to turn it to the direction where you would like music to go. I am under no circumstances promote the Bose SoundDock devise. There are plenty of the alternative units that might be better. Bu I do feel that the presence of such devises with their ability to access internet and to be managed locally does illuminates (in my view and for me) to have a permanently installed acoustic system outside.
It would be different if you need to entertain let say 50 people outside but for private use I feel the small portable devise would do.
"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche