My receiver has a impedance switch which has two option: 4-6ohm or 8ohm. The problem is that my system have different brand of speakers with different impedance. My main speakers are at 5ohm and others are at 8ohm. Whic impdedance I should set for the receiver? Does it have any effect on the sound? Thanks
You'll probably want to match your fronts with the correct impedence. They're the big workhorses and you'll want them sounding their best. You're surrounds will still sound just fine after you set your impedence at a lower level.
Paul is right set the receiver for the 8Ohm setting. If you set it to the 4-6 ohm setting the power supply in the receiver will limit it's output and may reduce your available volume before clipping by as much as 50%! If however you do this and the receiver clips or goes into protection mode with a moderately not exteme volume very often then it's time to reevaluate the situation and purchase a more powerful receiver or buy an easier to drive speaker set. The continued use under the above condition will result in damage to the receivers amp and/or damage to the speakers. E.Ramsey AAS industrial electronics