Audeze claims a sensitivity for the LCD-X of 95dB SPL for 1 mW power input which, for the stated impedance of 22ohm, corresponds to a voltage sensitivity of 111.6dB for 1 Vrms. Our measurements show that this S a significant understatement of what the LCD-X actually delivers, which amounted to 115.1dB at 1kHz for 1Vrms input, averaged for the two capsules. While this exceeds the previous highest we've obtained from a planar magnetic headphone [114.4dB for the Oppo PM-1, HFN Jul '14] it has to be borne in mind that the Oppo's average impedance is about 31 ohm whereas the LCD-X's is about 20ohm - a difference equivalent to a 3.8dB boost for the LCD-X - so the inherent sensitivity of the PM-1 remains higher. In fact if you perform the same calculation for the Audeze LCD-2 [ 106.0dB and 59ohm, see HFN Mar '13] it is apparent that the LCD-X's sensitivity advantage over its lesser sibling can be ascribed entirely to its lower impedance.
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