Question for those who already have this headphone. I just received mine about an hour ago and while I realize they need to be broken in for up to 200 hours, they sound very bright and somewhat weak on bass. How much change can I expect once broken in? I have yet to try any of the dampening pads and figure I'll wait till the stock headphones are fully broken in. My other headphones are Sennheiser HD 660 S which sound completely different and definitely warmer.