I just got a new refurbished Spring 2.5 GHz i5 Macbook Pro, and upgraded it to 10.6.6 yesterday. The speaker volume is great. But the headphone volume is very low in comparison to my old 2007 15" Macbook Pro. I don't think it's my earbuds -- the volume is not low when I plug them into my 2007 MBP, my PC or in my iPod nano. But on the new Macbook Pro it's very low. My old MBP is also running 10.6.6. Is this a problem with my computer? Is it a problem with the new unibody MBP's in general? Is there a way to make the headphone volume louder? I'm NOT getting any warning lights and the headphones show up in the system preferences. Thanks for any advice.