Want Better Sound? Have an iPhone connected to your car audio?
I just discovered something and I'm not sure if anybody knows.
When I play golf by myself, I use one headphone in one ear and put the audio on "mono" so I get to hear the whole range instead of left or right. So I forgot to turn off "mono", and plugged it into my USA Spec and wow. The highs were louder and the bass was bumping! It was not as "dynamic" sounding, but it pumps. It's a dramatic change to the point where it's like a new head unit.
Give this a go if you want more bang. On your iPhone, under general settings, accessibility, turn mono audio on. I would also assume that anybody with a non Apple product could do the same if the device has the option to turn on mono audio...