Sounds seem to quiet when shooting.

Hey guys, I just bought a new HP Pavilion m7 today, the first thing i did was install Garry’s Mod. The problem I noticed is that when I shoot weapons, for example the HL2 Shotgun, the sound quiets down during the firing and reloading, and then the volume goes back up when the reloading stops. This really makes all of the sounds in gmod sound terrible. I already tried turning off beats audio, but that really didn’t help. How should i fix this? It’s really annoying and i’d really appreciate some help. Thanks!

PS, I am using external speakers, and this only seems to happen with them, not the built in speakers.

Could be Loudness Correction, suggestion turn it off.