I have the same problem. I think I am just going to Ebay the drivers and all 3 enclosures. I have an extra pair of compression driver 2416'S that I could use to put in the 3677 cabinets. They would make great rears but I don't have room for them. You could put the M115 in the big bass cabinet just to see how they sound. If you run the T/S they look OK but you need a big box for them. Don't think they would work well as subs for your 7Pi's. Well let us know I would sure like to know what you come uo with.