Hi, I am about to buy the AudioEngine A5's(Speakers). Some people say the sound output of the iMac is not very good since it is a headphone output and told me to buy an Imic. My question: Does the Imic(USB) noticeably improve the sound quality?, does anyone have experiences with it? There is also the Creative Xmod, which will be better? p.s I will not use it for recoding of vinyl/LP ripping. Just for my speakers. Thanks!