Just got a pair of Audio-Technica ATH-M40x, but the 3.5mm connector doesn't fit well in the front audio port of my 2008 Mac Pro. Is this a known issue? They fit into my iPod Touch just fine, so I'm sure the issue is the Mac Pro audio port. I have another pair of headphones that fit fine, and the Audio-Technica connector fits fine into another port I have on another pair of speakers.