Hello, Recently, I purchased this pair of Bluetooth wireless headphones. They have decent reviews on amazon, most people say they have very good sound quality. I can say that I wasn't expecting amazing sound quality for that price, but they are pretty OK. The issue I have is that the sound quality is noticeably worse when listening in wireless/Bluetooth mode which is how I intend to use them. I can hear some crackling when the music plays on a set of frequencies. As soon as I plug the 3.5mm cable and use the wired mode, there is definitely an improvement over the sound quality. I tested with both the Bluetooth transmitter on my F550J Asus laptop and my LG G4 Android phone; they're both equipped with Bluetooth 4.0. Is it expected to have poorer sound quality through Bluetooth? Thank you.