As shown in the diagram, the channel definition of the four-section connector on the BC150B-MV is different from that on the Chinese Standard 3.5Pro.
The dual-wire and single-sided design makes the headphones cable inevitably heavy, which tends to damage the socket when it's subjected to lateral force. This protective cover prevents it from these damages and makes the overall appearance more attractive.
Audiophiles love listening to music with the MDR-MV1, partly because the sound of these monitor headphones is not that typical impression of monitor flavor. It's quite unique, easy to drive and suitable for pop music. Using a 4.4mm balanced cable with the MDR-MV1, it's required to avoid too much change in high-frequency resolution, and after improving the driving ability and dynamics, it can still keep the thickness of the middle and low frequencies. The BC150B-MV upgrade cable is capable of retaining that original flavor of Sony headphones.