QKZ ASF Balanced Armature Earphone is the latest product from QKZ Electronic. It has been designed especially for people who want a to listening music with more than the ordinary Earbuds. This one has the ability to produce music in two different frequencies. So not only can you use it with your MP3 player or any type of music device, but you can also use it in Studio for music productions
The main characteristic that sets the ASF from other ordinary earphones is that it utilizes phase-shifting circuitry. The ASF actually changes the current from high to low according to the dominant frequency of the incoming signal. And since it has two different currents, the result is that it produces two separate sounds, one is for your ears and one is for the mind. It is called Q-Switched Current Amplification. Some people might say that it is some sort of stereo headphones, but it is different from it.
It is quite expensive compared to ordinary earphones because it offers much more. It has a noise-canceling feature, a microphone input port for microphones that are depends on you choice or add in the package, it should be the best choice of your music taste .