hi, before i make my purchase of aperion speakers i just wanted to get advice from you guys.  i have a yamaha rxv571 receiver and i'm looking at the intimus 5b for the fronts, the 4bp for the surrounds and either the 4c or 5c for the center.  however i noticed that the 5c is 6ohms and the rest are 8ohms. so am i better off getting the 4c with this setup or getting the 5c and setting my receiver to 6 ohms eventhough only one speaker will be requiring the 6 ohms?  from my understanding, when u set to lower ohms, the receiver loses some amp power, is this going to be significant or still have enough amp power for your avg ht viewing? i dont need to crank the thing to enjoy a movie.  my room is roughly 12 x 20 with 9 foot ceilings and my seating position will be roughly 8-9 feet away from the tv and center ch. oh forgot to mention that i have a martin logan sub on order.

thanks for your help