For the headphones that have the microphone built in the ear cup, a re-seat is performed before each pass. For the last 2 passes, the microphone is allowed to dangle freely in order to simulate the random positions the microphone could end up in real-life situations. For headphones with an in-line microphone, the microphone is fixed at 0/90/180 degree angles relative to the speaker. For the Weighted THD test, a swept sine is used since it is better at catching the distortion artifacts produced by the AGC algorithm, compared to a pink noise.Įach device is tested 5 times and the results shown here are the average of 5 passes. The reason for using a pink noise instead of a swept sine is to circumvent the effects of the automatic gain control (AGC) algorithm that most the active/Bluetooth headphones use. The signal for the LFE, FR, HFE, and gain tests is a pink noise (random noise with equal energy per octave) limited between 20Hz - 20KHz.
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