I own both 2C (surrounds)and model 3 (fronts) for my home theater. They are sonically similar, the 3s just do everything better. More effortless bass, a cleaner smoother midrange, more air and extension in the highs. The threes play louder without sounding distorted. Although I don't have the latest version of either I imagine the analogy is still the same.
The threes are more demanding of the amplifier and will not sound nearly up to their potential without a good amp.
The threes are more demanding of the amplifier and will not sound nearly up to their potential without a good amp.