In my opinion, based on my listening experiences with the Heresy IV's, I think Klipsch should rework the issues with box resonance on the IV and I think it would be an even greater speaker by comparison. Other than this issue, I really think the IV is a sweet little speaker that deserves most of the positive recognition it has gotten. The improvements Klipsch made to the bass are wonderful. Even though the bass is not as audible at low volume levels compared to my Forte I's, the Heresy IV is still a sweet little speaker in my opinion.
Happy listening,
---daniel