Paradigm Studio Reference Speakers
Paul,
Congratulations on your purchase of the Paradigms - you should be excited. After owning almost an identical configuration for 5 months, I feel certain that you won't be sorry with your selection. I have an extremely similar arrangement - 100 v.3s, with a CC-470 and ADP-470s as rear channels, paired with a HSU TN-1220 sub, and they produce a marvelous sound when driven through my B&K AVR-507 & HSU 500 watt SubAmp. I've never had any of my audiophile friends complain, but maybe that's because the wet bar is directly behind the rear wall. Hmmmmnnn
My listening room is about 17w x 22d, with 10' ceilings, and large openings in the back and sides. My ADP-470s are mounted on the rear wall about 9' up on the factory supplied brackets, with no adjustments made for angling or tilting the speakers downward. Based on my listening experience, I think I am getting excellent surround coverage, and there is no need to angle the speakers downward. Remember, they have excellent dispersion, and what little bit of angle adjustment you might try and add probably would not amount to much, anyway. I'd be more concerned with ensuring that you have a good, solid, sturdy mount for the speakers on the wall. If you still are concerned, you can always bump up the volume a bit on the surround channels. However, I think if you can mount them lower than 9' high, you shouldn't be too concerned.
Enjoy your new system. I feel certain you'll love it.
Pat