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Sennheiser CXC 700 In-ear Active Noise-Cancelling Headphone Review$229.95
For the most part, the Sennheiser CXC 700s manage to stay relatively within our ideal limits, but there are a few anomalies that are worth mentioning. For instance, the 0-350Hz range (the bassiest sounds, synths, and kick drum attack) is dramatically overemphasized, as well as the 7-9kHz range (where you'd find most of your sibilants and cymbal sounds) will sound a lot louder than the rest of your music. Not ideal for audiophiles, but some people like emphasis in these ranges.
There was a 1% general distortion level, culminating in a low total sound pressure level. This should be inaudible to all of our readers, unless you are a Head and Torso Simulator robot.
The tracking response for the Sennheiser CXC 700s was mostly even, save for two semi-audible shifts at the lowest and highest ranges. Most users will not hear it.