First, the principle of noise reduction is different.
Physical noise reduction is to fill the ear cup with sponge, isolate the noise through the ear cup and sponge, and have certain requirements for the clamping force of the ear cup. If there is a gap between the small ear cup and the ear, the noise reduction effect will be worse.
Active noise reduction is to set an intelligent noise reduction chip in the ear cup. When the headset's built-in pickup sensor senses external noise, the smart circuit generates sound waves opposite to the external noise to cancel out the noise.
Second, the price is different.
Physical noise reduction production is simple, relatively cheap, generally tens of yuan to one or two hundred yuan can be bought.
Active noise-cancelling headphones have high technical requirements, and the price is generally more than 1,000 yuan.