im following up from a post that went up on this site recently (21st August), where it was looking at the finest hi-fi systems based around a laptop. The components chosen were Apple MacBook Air (13in) Audiolab M-DAC to make the laptop music shine, and Grado SR325E headphones. I have both the audiolab m-dac and the grado headphones, i don't have the apple mac book air and at the moment i am currently using my old 2006 apple imac desktop using usb and ripped cd wav files into itunes. would anyone know if using a 2006 imac would negatively impact the sound compared with using the suggested 2015 Macbook Air? What i was thinking of doing was buying an Ipad(maybe wait for the Pro in nov) and use that with the dac and headphones instead of the macbook air. I am aware that ipad's do not have a usb in order to connect it to the m-dac but i was hoping it would work buying a lightning to usb camera adapter and connecting it by usb with that, any idea if this can be done, and would there be any differences or disadvantages with not using the mac book as suggested from the post. any ideas or advice would be greatly appreciated.