1 of 2 people found the following review helpful
Great sound....a little fiddly to fit but I say give them a chance!,
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This review is from: Sennheiser OCX 685i Sports In-Ear Canal Headphones - Black (discontinued by manufacturer) (Electronics)
Delighted with the sound on these. Great bass. Not tinny in the least. Dunno bout Red Bull but new earphones definitely give you wings!
Re fitting: I had to mess around a little with them. The first run I took them on was 10k in pouring rain. Whilst they didn't fall out they did work a little loose. I changed the bud sizes and have discovered one ear needs larger bud than other. Also squeezed the around ear fittings a little to make a more secure fit. They seem to be working just fine now.