Originally Posted by Kurolicious
This is not a "myth" and I don't think you read my post correctly. We both agree that if you are using Nanostats for all 5 speakers, the crossover should be 100hz or 150hz. However, that is not the case here. The Nanostats are being used as surrounds only. His mains are very capable of playing bass well below 100hz and would be wasting their full potential with a crossover that high. He also will experience bass localization as well.
My suggestion would be to play some content and experiment with the different crossovers to see which sounds best to you.
You are repeating the contention that there is no low-frequency data of any significance in the surround channels of 5.1 program material. I am saying that's a myth. It may be true of the way typical theatrical movies and TV shows are mixed, but it's not true of all of them, or of other types of material, particularly music. And there are other ways an AVR can be used, such as "5-channel stereo" modes, that send full-range signals to all channels.
This will matter if a system is set up so that bass information contained in the surround channels is not redirected, and cannot be reproduced by the speakers. This would be the case with nanosats crossed over at 100Hz.
I agree that crossing over the whole system at 150Hz is a waste of some excellent mains. That doesn't change the fact that crossing over at 100Hz is also a compromise. The fact is that this is exactly the kind of system configuration that reveals the greatest weakness of these AVRs - their inability to set different crossovers for different speaker positions.
Which compromise will sound least bad? I agree that listening is the only way to tell. Can the need to compromise be avoided? Not with this AVR. The only solutions are to replace the AVR or to replace the surrounds with speakers that can be crossed over at 80Hz, which would be optimal for the Mirage mains. (Assuming the center can work with that setting, I missed what model the center speaker is.)