I have S9-HD and it works perfectly.
A lot of S9-HD's bought off of eBay are knock offs. That's what mine were... I bought them for $13 (bidded, so I didn't think much of the low price).
However, they work but with poor-mediocre sound quality (which I'm happy with for what I paid). I imagine some of the knock offs not working at all with certain devices.
Where did you buy your S9s?
Interesting...well I def do sweat a lot when I workout..so its possible.. i may need to buy one off ebay or something because I love this headset and hate the new s305.
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