Article: Objective: Audeze LCD-4z Headphone Review With Measurements

[bluesman]

Very nice - thanks!! I have one minor suggestion though.  It is true that "... the 1.5 kHz to 4 kHz range, [is] also the range our hearing is the most sensitive" for totally normal ears.  But a discrete drop in threshold sensitivity centered on 4kHz (i.e. a notch) is the hallmark of noise-induced hearing loss, and a loss of threshold sensitivity as a sloping low pass function affecting frequencies from about 2kHz up typifies presbycusis (hearing loss commonly associated with aging rather than trauma, toxicity, or otologic disease).  So most humans will lose threshold sensitivity between 2 and 4 kHz from some combination of noise exposure and aging as we pass 50+.