exactly the same comment Thierry F. This helmet is beautiful and built to look good but it's really all, the issue is not nothing serious at all, and yet my unlistenable lumia 735 has a good sound with other headphones sony 20 years old and an Audio Technica, in short, I think even without return refund since I will listen more. I wonder if Sony gents we tried, I doubt. Really a bad experience this helmet. I highly recommend. cordially