I have not heard the amati's with subs in particular but I know they are full range which are the easiest and least intrusive to match with a subwoofer. The lower the crossover point the better. I'm guessing the amati would crossover somewhere in the 20's which is extremely low.
By a fair margin the sub will sound it's best in a corner. This is because you can position it so that it excites the corner walls and uses them as large passive bass radiators.
By a fair margin the sub will sound it's best in a corner. This is because you can position it so that it excites the corner walls and uses them as large passive bass radiators.