I'm trying to connect a pair of studio headphones for audio for a Quest 2, but the audio is super quiet. I imagine it's an issue with power to the headphones, had it at first with my PC but was able to solve it with a different cord. It's a pair of Beyerdynamic Custom Studios (Basically DT770s) and it's a 3.5mm jack at either end. 

What cord should I be using for this? Do I need an amp, is there one designed for this sort of thing? Anyone run into this before? I'd just use a Bluetooth set but that shit has too much delay.