Recently, due to some upgrades and a small room (have room treatment), I moved the sub from the front wall to a short side wall which has an opening to the kitchen, and found the placement of the sub to not sound ideal.
I use the sub for HT, but always run the HT3's full range for two channel (direct) listening, which shuts the Velodyne off.
My thoughts are, because the HT3's are rear ported and need breathing room, I assume placing the sub behind the tower (an inch or two from touching) would be a bad idea, especially for critical two channel listening since the tower's ports are essentially blocked?