Some years ago, I met a lady who lived far away and I needed something more portable than a CD player and K501. So I bought an iPod and IEMs.
But to get the right ones, I had to learn about DAC chips (because the older iPods have better DACs), the different driver types (because many IEMs are balanced armatures instead of dynamic), and impedance (for ER4S variants). So for even that small purchase I had to learn the basics.
Edit: Later, I wanted to use my iPod with K702 so I had to learn about amps.
Edited by Claritas - 3/2/14 at 5:40am