I have experienced substantial static noise on my Sprint variant of the Samsung Note 7 when using headphone jack to Aux in my car stereo. The static's volume was substantial and made listening to music unbearable. I was thoroughly disappointed that this brand new phone sounded like garbage, and thinking it was a hardware defect and considered returning the phone. I decided to troubleshoot this problem, and found an odd solution, odd because it seems to be a software issue. So, while my phone was streaming music and producing static while plugged into the Aux car stereo, I jumped into settings and toggled on the 'UHQ upscaler' found in 'sound quality and effects' at bottom of sound settings menu. (( Settings > Sounds > (Advanced) Sound quality and effects > UHQ upscaler )) Toggling this switch immediately got rid of the static issue... even after turning the toggle back to off. 
Static / White noise Experience Continued....
So, while listening to static free music via Aux cable to car stereo, a call comes in through phone app, static immediately resumes as phone app takes over sound settings. I answer the call and static continues to come through car speakers obscuring the caller's voice. (no, this is not static from a microphone / speaker feedback loop) So, I unplug aux cord and place phone against ear the old fashion way. When call is about to end, I plug Aux cable back into phone, static resumes until phone call ends (phone app releases control of sound) at which point music resumes playing without static.
Troubleshooting methods tried while figuring out static via Aux cable to car stereo:
- plugging in various Aux Cables ( no effect )
- unplugging charging cable while listening to music ( no effect )
- playing music on Note 7 to home stereo via 3.5mm to RCA cable ( Did not produce static )
- toggling UHQ upscaler (( eliminated static via Aux cable to car stereo after toggling on (or off, after it has first been toggled on), static returned for duration of native phone app call and disappeared after call was over ))
I find this issue to be quite odd, seems like it is some sort of software issue... Is anyone else experiencing this or something similar?
STATIC!!!!!
Edit: After doing some more research found that the galaxy S7 and S7 edge suffer from same problem. Workarounds include toggling UHQ upscaler ( Settings > Sounds > (Advanced) Sound quality and effects > UHQ upscaler ) and/or purchasing a Ground Loop Noise Isolator...
Static / White noise Experience Continued....
So, while listening to static free music via Aux cable to car stereo, a call comes in through phone app, static immediately resumes as phone app takes over sound settings. I answer the call and static continues to come through car speakers obscuring the caller's voice. (no, this is not static from a microphone / speaker feedback loop) So, I unplug aux cord and place phone against ear the old fashion way. When call is about to end, I plug Aux cable back into phone, static resumes until phone call ends (phone app releases control of sound) at which point music resumes playing without static.
Troubleshooting methods tried while figuring out static via Aux cable to car stereo:
- plugging in various Aux Cables ( no effect )
- unplugging charging cable while listening to music ( no effect )
- playing music on Note 7 to home stereo via 3.5mm to RCA cable ( Did not produce static )
- toggling UHQ upscaler (( eliminated static via Aux cable to car stereo after toggling on (or off, after it has first been toggled on), static returned for duration of native phone app call and disappeared after call was over ))
I find this issue to be quite odd, seems like it is some sort of software issue... Is anyone else experiencing this or something similar?
STATIC!!!!!
Edit: After doing some more research found that the galaxy S7 and S7 edge suffer from same problem. Workarounds include toggling UHQ upscaler ( Settings > Sounds > (Advanced) Sound quality and effects > UHQ upscaler ) and/or purchasing a Ground Loop Noise Isolator...
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