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This review is from: Denon AH-C400 In-Ear Headphones with Microphone (Electronics)
Although these earphones look like excellent quality, I cannot discern any noticeable difference in the sound quality to my older Sennheiser in ear phones which where a third of the price. I could not get any of the rubber and foam ear pieces to suit me any the ear pieces needed constant pushing back in.
Resorted to modifying a set of foam ear plugs normally used to block noise by punching a small hole through them to take the speaker cone. Holds much better than those supplied.