Last night, I watched the movie The Wolf of Wall Street. Good movie, btw, but not a family movie. The reason I'm mentioning it here is because of the new EP500 v4. This sub-woofer definitely outdoes the EP350 v3 in over all bass quality sound. I'm much pleased with my decision to upgrade. The difference isn't always noticeable, but when it is, you really notice it. I spent a good 2-4 years (I forgot which) with the old one, so my ears are accustomed to it's sound.