Touch bar MBP Mid 2017 Speaker issues

[jabz10]

Hi, I have a real strange problem with my speakers on my 15" tMBP Mid 2017.

After I resume from sleep, (which is how I use it 90% of the time, I shut the lid and it sleeps) and I play any videos Youtube, with audio, the sound will switch to mono and sound muffled.
It doesn't matter which browser happens in both Safari and Chrome. Only a reboot fixes it. Until the next time I resume from sleep.

When the issue is occurring, I launch iTunes and play music, it will start off in stereo, then switch to mono.
Doesn't matter if its streaming music, or local files.

Anybody know whats going on? And how do I begin to diagnose this?
The Accessibility setting "Stereo as Mono" is not selected.

I don't recall it happening when I got the machine, only since I updated to High Sierra I think.
[doublepost=1515036072][/doublepost]Ok I just did a SMC, and NVRAM reset, same result. Actually I think the issue is persistent even after a reboot, shutdown/resart. Sound starts off stereo and then changes to muffled mono.

If I plug earphones in, they sound fine in stereo. When I unplug them I'll get a few seconds of the speakers sounding good in stereo, then change to muffled mono.

Next I might wipe it, and reload a fresh copy of High Sierra. Unless there are other suggestions?

 

[HawtTuna]

Do you have a 15 inch or 13 inch MacBook Pro? Does it make any weird popping noise before switching to mono? My 15 inch MacBook briefly had a similar problem before I heard a very loud pop noise coming from my right speaker and a whirring grinding noise coming from the right side of my MacBook. Now my right speaker sounds very muffled.

Hopefully it's not a hardware problem for you like I suspect mine is.

 

[jabz10]

Hi it's a 15 inch. No I don't hear a pop or anything like that, it just switches to a weird muffled mono sound.
The speakers are capable of great stereo sound, cause I hear it like that on occasion, however after a few minutes it changes.

I suspect there is something dodgy with the OS load, so Im going to wipe it and clean install High Sierra.
Although I did do that a about a month back reloaded Sierra and upgraded it to High Sierra.

 

[PBG4 Dude]

Never heard of such a weird audio situation. I would check your audio output settings using the “Applications —> Utilities —> Audio MIDI Setup” program. I’ve had these settings tweak themselves on me once or twice in the past, but that was related to an HDMI monitor constantly trying to be the default audio output destination.

 

[jabz10]

I've double checked every setting. I can now reliably recreate the issue, just turn the volume up to 70-80% when playing a video/sound and the issue occurs, you can hear the sound change to predominately the left speaker, then all speakers will sound muffled.

I did another fresh install, I haven't installed any software, and I haven't restored from backup, and the issue still occurs. Im now putting it down to a hardware issue, time to call in apple care.

 

[Samuelsan2001]

I've double checked every setting. I can now reliably recreate the issue, just turn the volume up to 70-80% when playing a video/sound and the issue occurs, you can hear the sound change to predominately the left speaker, then all speakers will sound muffled.

I did another fresh install, I haven't installed any software, and I haven't restored from backup, and the issue still occurs. Im now putting it down to a hardware issue, time to call in apple care.

Agreed this sounds like a job for a tech.