Galaxy S5 audio headphone jack.how can I improve it?

[Steve40th]

Galaxy S5 audio headphone jack..

When I listen to the phone in my car, actually all 3 cars, the audio has some grounding noise to it. When I use the headphone jack with my regular headphones, no issues.
So, I have 3 different auxiliary jack cables, 2 regular 3.5mm and one 3.5mm attached to old style cassette tape. They all have problems playing when connected to phone. Very sensitive jack? I have cleaned it with alcohol, and blown it out. But why difference in audio output when compared to regular headphones?

 

[Steve40th]

Resolved. Not the phone, not the cables. Its the stereo system on two cars, yes two.

 

[B. Diddy]

Thanks for letting us know. Are those stereo systems factory-installed, or aftermarket? Same manufacturer or different?