iPhone 15 Pro Max sound is really quiet when connected to my cars speakers through USB-C to AUX adapter...

This worked for me and gave it a big boost:

go to settings, sounds and haptics, headphones safety, USB Audio Accessories, “Connected to Headphones” turn ON then back to OFF and it’ll give you a good 90% boost. Sometimes you have to turn it on and off 3 to 4 times in order to get that beautiful boost. Turning OFF Dolby helps a bit as well.

I did 4 things to fix this problem. I too purchased the iPhone 15 pro max and was very disappointed at the sound “dimming” through my aux/auto stereo system. Turning off the sound check helped a little, but not by much in my situation.

1) Made sure to turn the sound check OFF in iPhone settings.

2) Changed my newly purchased aux cord back to my old one. So I am using the “Griffin Survivor Aux Cable”.

3) Purchased the Apple “USB-C to Headphone Jack Adapter” to connect to my Griffin Aux Cable.

4) Changed the EQ setting to OFF on my iPhone. The first three steps were a huge improvement to increasing my music volume. I think my new aux cord wasn’t working too great. I also noticed that changing my EQ setting affected the volume as well.

I hope this helps.

Turn sound check off! In music settings!

one thing I found was going to spotifys playback and turning off “enable audio normalization” it instantly bumped the volume a good notch but it’s still annoying that it’s not as loud as past aux with dif iPhone

Wrong. You gotta turn off loud audio in the Headphone safety settings. np

Hi,

Idk if you’ve already found a solution to your problem.. i had the same but i figured you just had to turn off the sound check in settings. Hope it helps, it worked for me.

All the best.

Offering a little solution to this problem.

It doesn’t matter what settings I alter, wether it’s going to “sound & haptics” and turning off “reduce loud audio”

or

going and turning sound check off (this feature does not help people that use Spotify I’d just like to add).

or

forgetting audio device and choosing between the different settings

ANYWAY, HERES THE TRICK TO FIX LOW VOLUME LEVELS.

• Connect your device and begin to play music
• set a 3 second alarm and press your phones off button to go to the Lock Screen.
• when the alarm goes off press “stop”

your music should auto play and you’ll hear the difference in sound instantly.

(If you’d like to test this theory, after doing this trick, go to “sound & haptics” and turn reduce loud audio on then off, you volume should go to half but even when you turn the volume back up it won’t be as loud)

FYI (iPhone 15Pro Max user)

Go to the music setting and turn EQ to off is the only solution I’ve found and that only works for the music you have purchased my YouTube music still sucks

Turn off sound check and Dolby Atmos!

🤘🏼

Search for sound check in your settings and turn it off

Go to apple music settings and turn off soundcheck

If you’re using Apple Music go to the settings for Apple Music and turn sound check off.

BigKenD888 Said:

“iPhone 15 Pro Max sound is really quiet when connected to my cars speakers through USB-C to AUX adapter...“

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Troubleshooting CarPlay with Low Volume:

Seems to be catching on. Question is: "Just how many people have actually reported this to Apple?" Apple barely reads these forums as it is on their own time and will. So,…

Report this as a Bug to Apple...

Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of this, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread
4. Proceed from there as necessary