Volume levels are hard to discern over the internet as well as listener preferences during that moment but I would also look into the possibility that it might not be the room acoustics but rather that you are clipping the amp or at least starting to push it to its limits when you start turning it up to "high volume" which is causing the negative impact on the sound quality.

I’m armed and I’m drinking. You don’t want to listen to advice from me, amigo.

-Max Payne