Disclaimer: This is one of the loan units Rick has generously provided for me. I'll get to the IEMs once I am completely done with headphones first. Measurement was little tricky to carry out, as the stock earpads were continuously being disintegrated due to aging. I did my best not to worsen its current condition.
CON: A sharp deep-null at 4 kHz & Enormous amount of distortion in the low-frequency range due to its open-air/open-back design(radiation impedance).