I have the SMS-1 with the EP500 and I'm happy with the results. Granted tho, I live alone and don't have as many different seating positions as in your theatre room, and I haven't tried the SMS-1 mike in different positions other than the middle of my couch. Have you tried different mike positions to see if the FR curve is significantly different, and considered whether subsequently purchasing 1 to 3 more Axiom DSP subs would worth the money?
If ya got the cash, I'd say do it! We all love this hobby and if you're looking to further your sonic experience... I'm with you! Having followed your posts over these many months, however, I dare say you're at (or...past?) the point of diminishing returns for your $$$.. If you find that you hear a significant difference in various seating positions after the use of the SMS-1, then ignore my post and dive in! Just offering a friendly suggestion..
