I will add this question, do you have the M22s and sub properly calibrated? I have compared my M22s w/ PB13 Ultra sub compared with M60s and thre is very little difference. I suspect your soundstage issue might be due to the 6' spacing between the M22s and your listening position of 10'. The speakers should be spaced apart as close to the same distance you are listening to them. You could also try adjusting the toe-in or out of the M22s to see if that helps.
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Jason
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My HT