Stereo Separation: Better than 35 dB at 1,000 Hz; better than 25 dB at 10,000 Hz. Harmonic Distortion: Less than 0.3% (mono), less than 0.6% (stereo at 400 Hz, 100% modulation). 20 Hz to 15,000 Hz frequency response, 1.3 dB IHF capture ratio, and harmonic distortion under 0.3% in mono.