I bought this extension there are some days I try it for the first time today. The sound quality is completely different and very bad (no kidding, her rotten!) Sound that is not sharp, like having the "sound waves", really unpleasant. At first I thought it was the quality of the film I was listening then doing some testing, I realized that the sound was not at all the same as with the use of the helmet alone (without extension ) or even without a helmet and completely "deformed" so. Another trial with music: same (printing large messy when it is clear without the extension, we could barely hear the singing, not low net; its saturated whatever the level). Well, I may be have expected given the price ... I recommend anyway !!!