Is this normal ? Make sure your volume is low because my phone sucks !!!
https://www.youtube.com/watch?v=syrXCJ945_E&feature=youtu.be
https://www.youtube.com/watch?v=syrXCJ945_E&feature=youtu.be
Mine does the same. As long as you're not leaking your okay. Aftermarket cv's tend to be less exact too, if it's aftermarket