I 2nd the use of an SPL meter and you can use the test tones generated by your AVR. You should get some pretty decent results.

If you do decide to go up top with your CC, I picked up a set of these for $20 and was able to get a sweet angle toward the SS, plus they look very nice too. Nothing else would work and my CC would keep slowing sliding foward

I believe they also can be used to angle upward also.