Mixers Inside: Bozak AR-4 + THD explained

First DJ mixer i want to talk about is Bozak AR-4 rotary mixer. It's a device with significant sound signature. We will see how it looks inside and also measure it.
I will also explain what is THD - Total Harmonic Distortion. Important parameter that lets us check linearity.
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Music by Aleksander Erdmann and Stereometrix
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