All you need is 2 @ 0.99 each angled L brackets at home depot. Used for single shelf shoe rack. It will already have a 1" front lip and about a 10 degree down angle. If you need more angle then just put a wedge under the back of the speaker, the front lip will keep it from falling. The bracket with the brace will usually hold 50+ lbs per bracket (some are 75+ lbs). So 2 brackets spread 12" apart will hold any center channel speaker that I know of.
BTW Jace, I am confused, I am pretty sure he had said he looked at that model.
EDIT:: Here is an adjustable (or rather folding, and locks at different angles) L bracket (holds 750 lbs), but you would need to put on your own front lip, very easy, just use a 1" square block painted white and screwed in the front of the bracket from underneath.
Link
HERE
But I would still go to Home Depot and look for a cheap bracket in the shelving dept. first.
EDIT #2:: Oh yeah BTW, the claimed 750 lbs I am sure means that it is mounted into concrete, and surely you will be mounting into drywall. So don't test the 750 lb limit.

But yes, I am sure with proper drywall anchors it will hold 75 lbs per bracket, yet once again I would not do pull-ups on the brackets.
EDIT #3:: Oh yeah, before anyone says 'but that folding bracket only locks at terrible angles'
Please use a little creative thinking.
All you would have to do is find the angle you need, then drill a small hole in the side of the bracket. And put in a pin in the hole (or screw), viola you have any angle you want. Then do the same for the second bracket. You could say that this sounds like a lot of work, but hey even if you buy a premade bracket, you still have to get wall anchors. So if you are capable of hanging a premade bracket, then you will have enough ingenuity to mount a L bracket.
Also, I am not pointing fingers at anyone, certainly not in this thread. But sometimes I have seen the most simple questions answered with a bit of common sense.
Then again, hey, why don't you fellows start a business that sells the exact product the fellow is looking for. If I had the means (capital), I certainly would.