I've had iPod Generation 2, 3 and classic. iPhone 1, 3 and 5, iPad 1 & 2, Mac 8500AV, Mirror Door G5 (2 of them), the last top of the line liquid cooled powermac tower (2 of them), iMac 17 inch (three of them), iMac 27 inch, and Mac Mini... and I checked every one of them and they were all audibly identical... flat as a proverbial pancake. Transparent. Clean. Perfect sound.