I have just bought a Yamaha 671 AV receiver and need to power a set of Dimaond 10.6 floorstands for movies... Many BD movies are recorded in multichannel DTS formats etc...do I need to set anything to make sure that I do not lose any detail in stereo? Also I want to set the speaker impedance to 6 ohms on the receiver. Where do you do that? Sincere thanks in advance!