Polk, you can also try out the Granite Audio Ultimate Low Bass Test CD from Music Direct. A very useful tool in finding room resonances (rattles) and room nodes in and outside of the room. I have never used a Parc, but in your case, I would get the cd first and take care of room rattles before the Parc. While the disk is playing, have a pack of blue tack handy. You can also try Radio Shack Realistic Sound Level Meter if you want to compare sound levels with the Parc.
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