Your KA and KT look cool. I'm not going to change my receiver at this point it produces very good sound to me anyway.
Which velodyne sub do you have? I could pick-up velodyne in future shop, easy return policies. Just in case it doesn't work. And the cheaper the better as long as it performs, quick is good.
One more thing a lot of subs have R+L and my receiver has mono cable. Does that mean most subs are stereo and by connecting this way I will lose something?