I use an older Elite SC-07. Yes, use the room setup program. Set all your speakers as large. Use this as a baseline setup. You can always monkey around with different settings later on.
Personally, I'd use your CDM's as the side speakers, find another pair of used CDM's or a lesser pair of B&W's for the rears and run the full 7.1. The 7.1 matrix effect from the Elite is remarkable. The surround effect is more surrounding and the on screen dialog has better location plus its just way more fun. The few actual 7.1 titles can be stunning.
All to often one hears, "I don't need 7.1," and, "my rooms too small for 7.1." Well, you don't 'need' 5.1 either but you'll never hear of anybody going from 7.1 back to 5.1. With digital room correction no room is too small for 7.1.
Personally, I'd use your CDM's as the side speakers, find another pair of used CDM's or a lesser pair of B&W's for the rears and run the full 7.1. The 7.1 matrix effect from the Elite is remarkable. The surround effect is more surrounding and the on screen dialog has better location plus its just way more fun. The few actual 7.1 titles can be stunning.
All to often one hears, "I don't need 7.1," and, "my rooms too small for 7.1." Well, you don't 'need' 5.1 either but you'll never hear of anybody going from 7.1 back to 5.1. With digital room correction no room is too small for 7.1.