I have the Thiel 3.7's, MCS1 and Power Points.
Right now using a Sunfire True sub. I cannot seem to decide on what sub. The Thiel ss-2 is 5K. Would certainly want to keep it under that. Any recommendations. Mostly for HT but I do listen to music about 10% of the time
The HT is in the basement. 18 X 18 X 8. Carpeted floors, eight theater seats and stuff. Projector in box back of room. Metal door. I would not want the sub to be bigger then 19 x 19 x19

How large is the room? Does it open to other rooms? Is there a space/size constraint to the sub(s)?

The HT is in the basement. 18 X 18 X 8. Carpeted floors, eight theater seats and stuff. Projector in box back of room. Metal door. I would not want the sub to be bigger then 19 x 19 x19