OK, great idea. 90 degree adapter on order.
Order placed and equipment received in 5 days. Hooked up only one LF channel on the sub from RR2150, set at 100hz. Seems to work OK. I haven't had this much fun with my stereo in years. I'm actually sitting down and just listening to whole albums! The RR2150 sounds wonderful and the bottom end added by the ECS-10 is effortless in my 12x14x10 room. If it has any weakness at all, it does "look" a little small. That's probably a plus for some, but it gets a solid recommendation from me. Now I'm morally obligated to improve my CD player. I'm thinking about a Marantz SA8003. Turntable is next!
Oh Happy Day!