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).
In my case (Martin Logan), I did not notice any sound difference so I opted for safety and I use them down firing to reduce any cleaning and/or small children accidents which may happen and destroy the woofer.
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