I recently received a new pair of Sennheiser Game Zero headphones based on a lot of the reviews that I've seen. However, they don't entirely sound as perfect as the reviews made them out to be. Normally, the sound sounds slightly distant, whether it's music, talking, or whatever else. The best way to describe it is that it sounds like it's coming out of an old radio and not something designed for my ears. I read that people reported them sounding "less-full" without an amp, but that was for the 150 ohm version, and according to the site I bought them from, I bought the 50 ohm version. Is the default sound system on my motherboard not powerful enough? Or are there certain drivers/etc. I'm missing that prevent these from sounding how I want them to?