Good headset, but imbalanced sound

I really like the design of this headset, how it's foldable and how it fits my head. Installation (pairing) is a thing of seconds and the noise cancellation works great. Unfortunately the sound via bluetooth is delayed by some milliseconds. So if you still have the original tone on the tv on for some other listeners, it sounds like an echo in your headset, which might not be an issue for some users, because their headset is the only audio source. What I don't like with this headset, is the sound quality. It has to much bass. Bass and treble are not linear, which could be ok for music but not for a movie when you need to listen to the voices.

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