This is silly, the D1 is every bit better than the 1SC. It uses the same tweeter, upgraded driver, upgraded crossover, better proportioned encosure, new sound insulation lined interior etc etc. All this being said, it sounds better. It maintains all the midrange magic and adds deeper, better dynamics. I am shocked people preferred the older one, but maybe the new one was not broken in or who knows. The D2 is a totally different sound......not nearly the same midrange magic or extended highs as D1.