USB connected vs Bluetooth audio quality issues
Thread Starter
Junior Member
Joined: Apr 2017
Posts: 42
Likes: 3
AMG GTS
USB connected vs Bluetooth audio quality issues
Has anyone else noticed that when hard wiring an iPhone directly via Apple Carplay or using the Mercedes interface the sound quality is inferior?
It should be the other way around where the connected quality should be better than wireless Bluetooth.
The issue I'm referring to is the sound tends to distort. Since the volume controls on the phone are disabled when connected via USB there is no way to turn down the output level of the device which seems to result in the audio feed to input too "hot" with excessive gain and therefore distort on output through the Mercedes system.
I have not experienced this problem with Bluetooth.
This is noticeable on all sources: Spotify, Apple Music etc...all of which are set to no audio boost or equalization.
It should be the other way around where the connected quality should be better than wireless Bluetooth.
The issue I'm referring to is the sound tends to distort. Since the volume controls on the phone are disabled when connected via USB there is no way to turn down the output level of the device which seems to result in the audio feed to input too "hot" with excessive gain and therefore distort on output through the Mercedes system.
I have not experienced this problem with Bluetooth.
This is noticeable on all sources: Spotify, Apple Music etc...all of which are set to no audio boost or equalization.
Junior Member
Joined: Jul 2019
Posts: 18
Likes: 1
2019 g63
yes I have noticed this. When I play some music through Apple carplay it will produce a lot of bass. I assume this is what your are referring too. I will try via bluetooth and see if I notice a difference
Thread Starter
Junior Member
Joined: Apr 2017
Posts: 42
Likes: 3
AMG GTS
Based on the number of views of this thread and only one reply I’m assuming no one seems to have this problem...maybe I’m just hearing things or over analyzing.
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Joined: May 2003
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From: USA
18 G550, 24 EQB3504M
Has anyone else noticed that when hard wiring an iPhone directly via Apple Carplay or using the Mercedes interface the sound quality is inferior?
It should be the other way around where the connected quality should be better than wireless Bluetooth.
The issue I'm referring to is the sound tends to distort. Since the volume controls on the phone are disabled when connected via USB there is no way to turn down the output level of the device which seems to result in the audio feed to input too "hot" with excessive gain and therefore distort on output through the Mercedes system.
I have not experienced this problem with Bluetooth.
This is noticeable on all sources: Spotify, Apple Music etc...all of which are set to no audio boost or equalization.
It should be the other way around where the connected quality should be better than wireless Bluetooth.
The issue I'm referring to is the sound tends to distort. Since the volume controls on the phone are disabled when connected via USB there is no way to turn down the output level of the device which seems to result in the audio feed to input too "hot" with excessive gain and therefore distort on output through the Mercedes system.
I have not experienced this problem with Bluetooth.
This is noticeable on all sources: Spotify, Apple Music etc...all of which are set to no audio boost or equalization.
Super Member
Joined: Jun 2012
Posts: 928
Likes: 292
From: SF Cali Bay Area
‘13 911-4S, ‘21 CTR, '22 GT4, ‘19 G63
No issues here. I actually experience a sharper and clearer sound while connected through USB apple CarPlay.
make sure your equalizer settings on iPhone under settings isn’t activated as otherwise it might be the factor. Secondly, go in the audio settings for Apple CarPlay and adjust the treble / bass surround etc. I have it setup a way which is fantastic without surround sound on. Surround sound makes it more artificial and spacial that I don’t like. My burmester sound settings in my Porsche 911 are the same without any any surround sound. Burmester audio systems sound better without surround IMO.
make sure your equalizer settings on iPhone under settings isn’t activated as otherwise it might be the factor. Secondly, go in the audio settings for Apple CarPlay and adjust the treble / bass surround etc. I have it setup a way which is fantastic without surround sound on. Surround sound makes it more artificial and spacial that I don’t like. My burmester sound settings in my Porsche 911 are the same without any any surround sound. Burmester audio systems sound better without surround IMO.
Thread Starter
Junior Member
Joined: Apr 2017
Posts: 42
Likes: 3
AMG GTS
No issues here. I actually experience a sharper and clearer sound while connected through USB apple CarPlay.
make sure your equalizer settings on iPhone under settings isn’t activated as otherwise it might be the factor. Secondly, go in the audio settings for Apple CarPlay and adjust the treble / bass surround etc. I have it setup a way which is fantastic without surround sound on. Surround sound makes it more artificial and spacial that I don’t like. My burmester sound settings in my Porsche 911 are the same without any any surround sound. Burmester audio systems sound better without surround IMO.
make sure your equalizer settings on iPhone under settings isn’t activated as otherwise it might be the factor. Secondly, go in the audio settings for Apple CarPlay and adjust the treble / bass surround etc. I have it setup a way which is fantastic without surround sound on. Surround sound makes it more artificial and spacial that I don’t like. My burmester sound settings in my Porsche 911 are the same without any any surround sound. Burmester audio systems sound better without surround IMO.
Super Member
Joined: Jun 2012
Posts: 928
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From: SF Cali Bay Area
‘13 911-4S, ‘21 CTR, '22 GT4, ‘19 G63
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