Differing audio quality on mobile and pc when playing directly off/download from ACX website
So I'm pretty confused here. I am a producer working on an audiobook and this is the first time I'm exporting stereo files as I have sound effects that I want to preserve their channels.
When I listen on my PC to the audio in the DAW, it sounds great. I even used multiple types of headphones and speakers.
When I listen on my PC to the final rendered Mp3, it sounds great. Also used multiple headsets.
When I go to the ACX website and play the uploaded audio using the website player on my PC, it sounds great.
When I DOWNLOAD it from ACX website on my PC it sounds great.
When I upload the audio to google drive and download it on my phone it sounds great.
So far, all the same results.
But when I try to go directly to the ACX website and play it through the browser audio player on my PHONE, it sounds TERRIBLE.
Even when I DOWNLOAD it from the ACX website to avoid web compression on my phone, it still sounds terrible.
HOWEVER, it sounds normal when I download it from ACX AND open it in my mobile VLC app.
What am I not understanding about compression? Why is VLC giving me better results than normal audio playback? And do I have anything to worry about once the final audio gets uploaded to Audible and people play it on their Audible app?
EDIT: All my EQ is disabled on phone and PC as I suspected that. It's also worth noting this only occurs on stereo files. Mono sounds the same. It sounds like it is hollow or boxy. I also investigated VLC to make sure there we no enhancing settings on.