Im currently running a 5.1 setup with Infinity Alpha 50s as the main units and an Infinity Alpha Center in the middle. The surrounds I currently have are also Infinity, US-1s. I must say that I have been very happy with the 50s and the Center, so I dont intend on changing them anytime soon. However, I am now looking to upgrade to a 7 speaker layout, and as such, need some advice on both (a) the surrounds/rears and (b) some configuration issues. Firstly, with regard to the surrounds and rears in your opinion(s) should I (a) Use US-1s as surrounds, buy new rear units. (b) Use US-1s as rear, buy new surround units. (c) Move US-1s to alternative use, buy new surrounds AND rears. Recommendations? Thoughts? Either way, I'm buying new speakers, so are there any recommendations you would make? I don't want to spend an outright fortune, but... ahhh, you know. Just looking for capable units without breaking the bank. I'd prefer to keep the US-1s around in some capacity i.e. option (a) or (b), but would appreciate thoughts. Secondly, placement. A topic and a half I know. With the surround speakers, Dolby's site suggests that the L & R surrounds should be above ear level, but in line with the ear itself (so in the case of my setup, the surrounds will likely be mounted on the wall in line with the listening position). Question is though (or rather two questions)... how high above ear level, and should the speakers be angled in anyway (i.e. tilted downwards)? With the rear speakers though, there's far less guidance I've been able to find, probably because 6.x setups are still relatively rare. Again, Dolby's site provides some guidance, suggesting that the rears should be at a roughly 45 degree angle to the center of the listening area, or perhaps slightly more "toed-in" to the center. However, again, that's about as far as it gets - there's no guidance on (a) height relative to listening area or (b) whether the speakers should be angled (either horizontally or vertically, although their diagrams sseem to suggest that the rears should not be horizontally angled i.e. they should directly face the front speakers). I know this isn't an exact science, and experimentation will certainly be required, but just looking for some general guidance on where to start. Final FYIs (if these are of any help): receiver is HK AVR-325.