My head unit does not have a cd player
android auto or Bluetooth only
what tools or phone apps are you using to test polarity. Most of what of what I see on Amazon is the FH-168 tester with them emailing the audio file in a couple days after purchasing
this the best option for this task
or are there reliable phone apps and methods other than the fh-168
android auto or Bluetooth only
what tools or phone apps are you using to test polarity. Most of what of what I see on Amazon is the FH-168 tester with them emailing the audio file in a couple days after purchasing
this the best option for this task
or are there reliable phone apps and methods other than the fh-168