This is not under 200$ but this is most likely only dac\/amp combo you will ever need https:\/\/jdslabs.com\/product\/objective2-odac-rev-b\/\n\nMy son is looking at getting a nice set of cans and dac\/amp since he currently doesn't have the room for a full system. I know nothing about the headphone world. Would that unit cover everything he'll need? I see there's a USB input, is that where he'd hook his phone up to it or could he use the headphone jack on his phone? Is that pretty much a starting point price-wise for an amp\/dac combo?