The Thiel sub is about as good as one can get these days.
The crossove point will be room dependant to some degree--in terms of trying for a 'seamless blend'beyond thinking of just the obvious roll off of the panel--plus, I'd check phase since you're matching with a bi polar speaker. Don't be dogmatic in your assumptions, just experiment with frequency points as well as phase. Your ears will know.
Windell Diller at Magnepan should be more than helpful.
The crossove point will be room dependant to some degree--in terms of trying for a 'seamless blend'beyond thinking of just the obvious roll off of the panel--plus, I'd check phase since you're matching with a bi polar speaker. Don't be dogmatic in your assumptions, just experiment with frequency points as well as phase. Your ears will know.
Windell Diller at Magnepan should be more than helpful.