This mixer in fact is the most noiseless mixer I've ever heard. A whole lot quieter than most Mackie mixers within the same price range. I was also very impressed with the sound quality of the effects and it's precise knobs. Very lightweight and small enough to fit in any backpack. Perfect for Mobile DJs. The reason why I took one star off, because Sam Ash gave me a used/returned item that had some buzzing noises interrupting the audio via USB playback. Other than that, great mixer.