Low volume WINDOWS 10? [Need help!]

So I have been able to get sound by connecting the aux cord from my sub into my computer screen [LG 27M45-4] but the volume is pretty low and distorted. I've tried plugging it into the motherboard and everything, but the speaker icon in the sound tab doesn't show up anywhere and no sound comes through unless I plug it into the screen. I have a hdmi cable going from the screen as well into the computer for the display, but the sound is very low volume, even when everything is MAX. I have a Razer Barracuda Ac-1 sound card, with an ASROCK 277m motherboard. I've tried countless times to install Realtek Audio Drivers, they show up in the programs and features section and no where else, like I can't use them!

Look for an option called "equalization" under "enhancements" tab somewhere in Sound mixer options. My SB doesn't have that option but my Realtek ones at work do.