My 300-II finally gave up the ghost today after being put through its paces for three years, bringing an end to its working life. A few months back, I acquired the 400-II for use on my walks (and, at the time, I provided an overwhelmingly positive review of them:). The level of detail given to low frequencies is one area in which these two models significantly diverge from one another. In general, the sound is comparable, and some of my colleagues and I hypothesized that the "lower" models use rejected dynamic heads from the 400-II (which are, in turn, a fresh redesign of the CX-500 sans the II). When the headphones stopped working, I made sure to test the durability of the cable before throwing it away. As a direct consequence of this, two physically fit men were only able to break the wire at the point where it splits and leads to the headphones themselves. They were unable to even pull out of the socket, despite the fact that the housing of the plug was fractured. It's possible that they would have ripped anyhow, but it's unfortunate for the hands:) In general, it hasn't been for nothing that I've always claimed that you can hang yourself on senkhs without risking injury =))
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