build quality seems pretty neat, the connectors are made of metal (not plastic I confirm) and the braided nylon gives a fairly rigorous aspect to the whole. the body of fine jack keeps protecting its smartphone in case. a good point because many manufacturers do not think. the fact remains, I use it in my car to connect my MP3 player or my smartphone to the RCA input on the bottom of the dashboard and I must confess that I have to gain added 50% to regain power equivalent to a other source. there are losses it is obvious, especially in level (the ends of the spectrum are truncated which is quite normal, ventilation and lower but not catastrophic opening), but I'm not sure this is mainly but more due to the cable to the output quality of my smartphone and quality of RCA in my vehicle that are also very often of poor quality. Briefly, in the meantime he troubleshoots and when I have the opportunity to change my original post for the aftermarket with usb to preserve the original quality of the file.