I compare with charge 3 which I have for almost a year. Personally, my opinion was a little removed high, leveled the middle. The low ones are much better. I didn't feel much of a difference between stereo and mono. They connected with each other at the same volume, the difference on charge4 is deeper than the bass, slightly lower than the top, but it didn’t affect the volume and power, charge3: the bass is worse, the top is more expressive. Many will say that charge 3 is better than her stereo! Have you even compared the guys live, calmly at home? Or so they heard past the flight and make hasty conclusions. Personally, my opinion is charge4 for me it's better.
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