I wanted to run the A1s full range, so I opted to place the subs well out of their immediate proximity. I originally bought them to fill in at the very lowest octave and never wanted them to have to compete with the stats at a higher crossover frequency. The speed differential becomes very audible as the sub is asked to play at higher frequencies, so I play them at their minimum, 50 Hz. Since low bass isn’t very directional, I opted to place them at the very back of the room, and I find that they fill in quite well and don’t interfere with the A1s, who play well down into the 20’s.