![]() ![]() Nevertheless, this can be avoided at least to some extent by using reference tracks. So when working with HD 681 and the model average calibration, keep in mind that bass and treble may not translate as well. Since these headphones may vary so much from pair to pair, the average calibration profile that’s bundled with SoundID Reference can’t be as accurate as with other, more consistent headphones. Among the pairs we measured, the sub bass varies +/- 5dB and even more than that in the top end above 10kHz. This is where Superlux leaves a lot to be desired. How much do they differ pair to pair in terms of frequency response? There may be some issues in the high mid range and in rare cases in the very top end and sub bass. How accurate and consistent is the correction effect among different listeners?įor the most part HD 681’s perform well at delivering consistent frequency response to a wide variety of listeners. Overall THD is no issue for HD 681 and that is quite amazing for such affordable headphones. The harmonic distortion increase in the low end is nothing to worry about, and while the peak at about 4kHz looks troubling, it wasn’t audible in listening tests. THD performance of the HD 681s puts to shame some headphones that cost a dozen times more, including the headphones that they mimic, AKG K240 Studio. ![]() Good separation and clarity, not very wide soundstage than Sennheiser HD 800 but just enough for music. ![]() Mids could be improved a bit with detail (for female voice) After burn in and use several weeks, this 330 shows their true nature. Observations on how headphones perform after applying SoundID Reference calibration Total Harmonic Distortion Cons: Appearance doesn't look expensive, but plastic. ![]()
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