Ok, I'll try and explain this best I can. I used my iPhone 5 a lot of times to listen to music and podcasts through the AUX jack on the factory nav radio in my car (it's about 5 years old so it doesn't allow me to plug my phone in via USB). The problem is that I have to turn the volume way up on my phone and radio for it to be marginally loud when driving so because of that I was thinking of getting a portable amp hoping that it would solve my problem with that. I was thinking something like the Fiio E11. Then I got to thinking that since I also listen to music a lot on my MacBook Pro with Creative Aurvana Live! headphones, and soon I'm thinking about picking up UE 6000's, that maybe I should spend a little extra money and get a portable amp/DAC like the Fiio E7K or E17. It seems as though it could solve the amp issue with my car stereo and also provide me with a better listening experience on my laptop. I have a few questions. Am I correct in assuming that an amp would help with my car listening issues? With the headphones I am using is it worth using a DAC on my MacBook, or will I not really notice a difference? If I am using an amp or DAC with my iPhone 5 in my car, is the best setup to get the 30 pin lightning adapter and the also buy a LOD with the amp or DAC? I hope that I explained this well enough and I thank everyone for their help in advance.