I have recently purchased a pair of Salk Ht2-tl with matching center and am thinking about ordering two Rythmic f 15HP's. I currently have a pair of Velodyne Optimum 12's which like the f15's are a sealed design. I am happy with the Velo's performance thus far but am interested in a quad sub set up. My room is 17x12x8. My questions are. How well will the Rythmics integrate with the velo's? Should I run the velo's as a mid bass unit and let the larger more capable Rhythmics handle the lower frequencies? Is this bass management even possible? If so how? I would sell the velo's but it would come at a huge monetary loss. Or should I scrap the idea and be happy with what I have?