Crackling / popping sound
Please check the following:
Auxiliary (AUX) Port Problems: A common cause of crackling headphones is a defective AUX port, also known as a headphone jack. The quickest way to test if this is the case is to try plugging your headphones into several different AUX ports -- possibly on different devices -- to see if the crackling persists. Also, be sure to check that the AUX port and cord are fully plugged in. A loose or partially plugged in pair of headphones will often crackle due to a poor electrical connection.
Loose Wires: The rubber casing around wires can be bent and loosen or disconnect the electronic signal the wires are trying to send which may cause crackling noises in the headphones. Our cable is designed to last way over the 2-Year warranty period. Very rarely there might be a manufacturing error. Please check if you can notice anything on your cable. Also, you might want to try out the GSP 600 with the UNP Console Cable, which came as an accessory.
Poor EQ: Crackling in headphones / headsets can also result from poor quality of the source material (so e.g. music in 128 kbps) or a media player with bad EQ settings. If certain bass or treble settings are set too high, the volume can max out and then cause cracking and popping noises and can actually harm your headphone speakers.
Broken Speakers: The worst-case scenario is a broken headphone speaker. This could be the result of listening to media on high volumes excessively, long-term wear and tear, poor wiring or general physical damage.