For what I read your're not only on a budget , but you're trying to be as mobile as possible . For that , your monitors are not an option regarding mobility . On the other hand , if your monitors are self powered , then yes , you just need some adaptors to plug them to your US 122
. If not , you will need an amplifier to boost the US 122
's signal into your monitors thgough it .
If you stick to the ideea of mobility , I strongly recommend the Beyerdynamic DT 770
or DT 880
headphones to get the jobs done properly .