Nice setup, Cooper. As Brandon commented, there shouldn't be any electrical interaction between the sub and the M22 and unless the sub is physically touching and audibly vibrating the stand there shoudn't be any mechanical interaction either. As to a difference in level between the M22s, speakers of the same model can vary about a db in sensitivity, amp channels can vary slightly and acoustics between the two positions can vary, although looking at your picture doesn't show any reason for that factor. Probably no cause for concern unless you're talking about more than a couple db.
