Hi there,
There is absolutely nothing wrong with your phone and the adapter.The sound of the iPhone after 6S plus is not the same anymore.
It might be clear and speakers also improved
but lacks the power and the bass big time from the lightning port.I am buying iPhone
every year since 2008 and now I have XSmax
and Literally very disappointed with the bass
quality and the audio output from the lightning port.The speakers sounds good but the audio output from the lightning port can’t
compare to 6S plus.
The 6S plus had a kick *** bass nice and deep and explosive audio output from the headphone jack. When bought the 7 plus noticed the difference right away it was lacking bass, then bought IPhone X and bass
got even worse, then XS max 256GB and the
bass quality is a total mess.it sounds more like
mid bass.The kick in the bass is gone.I am very frustrated cuz my last 2 iPhones I paid full retail prices $1725 CAD for X AND $ 1952 CAD
for the XS max and I am extremely disappointed.I have changed adapter,used a
friends iPhone XS Max, same thing no difference.