Sony Vegas audio problem

What is the best audio quality for Vegas 14? I used an output of 48,000hz and 16 bit, using apple earphones, but when I play it through any computer system, it just sounds off and low quality. The project files range from different type of quality, with that I mean different type of audio files.

1. What render settings should I use?
2. Should I render audio only(because it has more options for quality than rendering video and audio at the same time) and then add it to the project?

Hopefully someone has some idea to fix this, thanks.

 

it should also be noted i used 32 channels of audio