audio channel

Having this problem on my iPhone 5s IOS 10.0.2 with two sets of original apple headphones. The volume is too loud while listening music or making calls using the headphone. If you set the volume to level 1 it's already too loud and if you increase it to level 2-3-4 you can't continue hearing...

Hey guys, Yesterday I was trying to fix my Logitech's speaker system while it was connected to my MBPr 15". I know, I'm an idiot. I was playing with the system's cables to find out which was the stereo audio ones and suddenly the right audio channel of the Macbook's headphone jack stopped...