Hi,

I'm wondering just how bad it is to block the back port of the 170s (by mounting right up against a wall)? Does it cripple the sound, or just muffle it a bit, or is it only discernable by a golden ear? These would be used as rear surround, so some hit on quality might be acceptable, but too much would not...

Also, I see two scews more towards the bottom than the top of the 170. I assume this is where the Omnimounts would go, but I had a very hard time even getting one screw into the cinder block of my basement wall for the current surround. So I'm suspicious of my ability to do more than use the current screws. SO... has anybody used picture wire between the two screws and hung the 170s upside down? Any sound tradeoffs involved??

Thank you in advance for your help!

Dan