Hi Legendarygoomba,
Welcome to the HP Community! I will be happy to help with the sound issue. What is your product number? There are a number of different models in the Envy 15 series. Any sound issues before upgrading or without the headphones?
Find your product number on a notebook:
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c00033108
Thank you,