I bought a pair of sennheiser hd 280 pro headphones sunday, well everything was fine. But when I try to listen to music with them, it seems way to quiet. I know it should be way louder then it is, I can hear the music and singing and a little bass but just barely even at max volume. I've tried them with my phone, my mom's laptop and my Sony digital audio center, and none of them make it loud. This is the most expensive headphones I've bought and I know it should be louder then this. Any idea as to what could be wrong? Should I just return them? Or is there a simple fix so I don't have to wait?