I havent personally used the optical out yet. I run an Audio Control matrix plus with mine and it made a world of difference. With the shallow mount of dudu I was able to get some 1.5’ rcas, and one splitter for the single sub out and fit it right behind the du. I also found the internal EQ doesn’t like to be pushed more than +3 or so db on some frequencies so if tuning a curve, I would take away instead of add then compensate with line driver.
