Quote Originally Posted by lordshiva
I want to know how bad it is going to sound, or if I'm ok. We're redoing our living room, and installing in-wall speakers. I just wanted good speakers and a 7.1 setup (using a Denon AVR 2310 CI) receiver so it can split 5.1 into 7.1), so what i initially did is this:

The center WAS going to be an Polk MC85 on its side.
The L/R fronts are Polk RC85i's (rectangles).
The L/R sides AND L/R rears Polk RC80i's (round).
The subwoofer is a Velodyne SC-600.

After I had bought all the speakers and they were being set up, my question of "is this center going to be awesome?" was answered with "yeah, it'll be ok" which prompted my "Only ok?" which was answered with "yeah, it'll be ok. It's just not a center speaker and only has one tweeter so it won't be as strong as a normal center."

Not realizing the differences in ohm's, I went back to the phone to where I bought the speakers and found out that the only in-wall center Polk makes is something called a "LCiC" (http://www.polkaudio.com/customaudio...ndex.php#lci-c) - but it cost a whopping $600 bucks. Going online, I found a place selling it for $317 and decided that I wanted a real center speaker. I purchased the LCiC (which is in the mail) and returned the MC85.

It was around here that I was told "cool center, but it's 4 ohms," to which I replied "So?" and was answered with "well, the other speakers are 8 ohm speakers" to which I stared at the guy and said "So?" and the was told that a 4 ohm center and 8 ohm fronts will ruin my surround sound and that I'm going to be able to hear a big difference anytime a sound moves from left to right or right to left from the front speakers because a "4 ohm speaker is a lot stronger then an 8 ohm speaker" - he then went on about how the Polk RC's are more geared toward audio (listening to CD's, etc) then movies, which they hadn't mentioned before... also, EVERY review I've read on the 'net about the RC85i's and RC80i's have been nothing but positive toward being used as in-wall speakers.

So anyway, the current setup (waiting on the RCiC in the mail) will be:

Denon AVR 2310 CI Receiver.
Polk LCic center.
The L/R fronts are Polk RC85i's (rectangles).
The L/R sides AND L/R rears Polk RC80i's (round).
The subwoofer is a Velodyne SC-600.

Will the LCic ruin my 7.1 surround sound system or am I overreacting?
Dont worry about it.
If you have the option of 6 ohms run it at that.
I have a 8 ohm center, two 8 ohm rears, and two 4 ohm fronts.
Everything runs fine.
Its probably better to run a speaker at a higher impedance, but in any case it wont affect the sound.
Might affect the vollume, the lower the impedance the louder the speaker will be,
as a general rule