Hello all, Last week I upgraded from MB to the new 15 inch MBP. I was in Tennessee for business when I bought it last week. When I got back to the hotel I turned on my upgraded Mac and noticed that the speakers were vibrating to an uneven beat. So much so that even a simple soft sound would run across my hand while I am typing. I brought it back to the Tenn. Mac store. The Apple Genius tried for himself and said that he's never seen this issue before and ran diagnostics. He came back and said that it was defective and replaced it for me with another brand new 15" MBP. He opened it up to test it out and it seemed to be the same exact problem. He agreed that it sounded just like the other and said it didn't feel right. He ran diagnostics on it and told me that it was at the extreme high level before they consider something defective. Keep in my that the MBP had a promotion that it came with a Printer for free ($100 - $100 mail in rebate). So when they replaced the MBP the printer had to be there for the "exchange" because for the promotion both the MBP and the printer have to be on the same receipt. So I went back to the hotel that was a half an hour away and got the printer and brought it back for the exchange. I wasn't happy with that but I brought it back to the Hotel and used it that night. I couldn't get past how any little sound that came up would distract me because of the way the speaker pulsated on my hand. I looked at the serial number and it was one off from the original. Maybe it was a bad batch. I brought it back to NY where I live and Apple replaced it for me with no problem again. Now these speakers work perfect but one of the USBs don't work. It doesn't recognize anything plugged in. I'm really disappointed. This is my 3rd MBP in a week. I feel like I should speak with them again. Has anyone ever dealt with something like this? I am a very loyal Apple customer and have never experience anything like this in all my years using their products. I appreciate you reading and any advice given.