Just added down-firing subs (Omega 10", sealed) to my Omega single driver speakers. I could ask Louis, but why do you think he designed them to be down-firing? My prior REL and Rhythmiks were side-firing (used with very different systems).
I've tried both configurations with the exact same subwoofer. With downfire, you do hear the bass, but you don't get nearly as much "punch you in the chest" type of sonic impact.
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