Subs in general are very room placement dependant to get the best performance. I would try various available places in your room for the sub and see how you like it. The set up of the sub controls seems good to me though again you may want to try a few x-over positions in the various sub placement experiments. Any sub x-over setting from 50 Hz and up will match with the M3s.

Ian Colquhoun
President & Chief Engineer
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Ian Colquhoun
President & Chief Engineer