If there is a link that will help me I am more than willing to look at it, but I don't really want to read anything more than 5-10 pages.
I do not understand why you would put a dac onto say an ipod which already has a dac in it. Unless you can turn off the dac function on on the ipod. This may sound stupid, but it sounds stupid to me to run a better dac after a worse one. I am not sure if the benefit could be that much unless the portable dac also improves an incoming analog signal. I am sure that I am just confused on how the hardware interacts. I do photography as a hobby which means I do not mind spending money on quality equipment, but not needless equipment.
I think this is probably a very simple thing that could be explained quickly. I thank you for taking the time to help a neophyte out.