You will never get it to sound the same when you are standing up, it is a characteristic of the planar speaker. You CAN help this by tilting them as the previous poster mentioned.
I have a pair of SL3s (the precursor to the Ascent) and I use a Bag End Infra 18 sub. It mates pretty well, but you have to play around with how you hook it up. I am using the Logos center which is no longer produced. A used one will run you about the same as a new Cinema.
I am using the Alpha Core MI3, double biwired and have pretty good success with them, although I haven't tried anything else for a while.
Good luck!
I have a pair of SL3s (the precursor to the Ascent) and I use a Bag End Infra 18 sub. It mates pretty well, but you have to play around with how you hook it up. I am using the Logos center which is no longer produced. A used one will run you about the same as a new Cinema.
I am using the Alpha Core MI3, double biwired and have pretty good success with them, although I haven't tried anything else for a while.
Good luck!