Each pair of Knops has four steps. Adjust the Knops to step one and you will hear what you would’ve heard without plugs. But the real kicker enters the stage when you switch to the other three steps. Step 2 will reduce the volume to filter the noise of a vibrant city, step 3 will adjust the volume to a live music setting and step 4 will create a silent environment ideal for work. Four different modes for basically every audio situation. Knops uses no electronics, no apps and no batteries. Instead our earbuds are acoustically engineered. The real sound is filtered using good old physics. With the help of computer simulations and real-world prototypes tested in acoustic labs, Knops was tuned. Working with the natural response of the ear canal a similar reduction in dB across all the frequencies was created. Creating a very flat response curve. This means that sound travels through all the four steps with minimal distortion, mimicking the natural resonances of the human ear. So crystal clear sounds, vibrant and natural.