Hi! I want to share that I got a better performance thanks to move the sub to the front wall and setting the front channels to large. I thought that doing this the sub will cut out the sound but it didnīt. The bass seems to come from the mains and I get, like Polk says in the education area, an "audibly invisible sound" from my sub.
The only thing that I donīt know with this setup is the frequency of the crossover, since with large setting the xover turn off.