amp/dac

Hey, I already own a Scarlett 2i4 from Focusrite and I've been wanting to switch out my old half broken hd598s for some dt 990 pros. Can I hook up an ext. Headphone Amp to it and if so how would I go about doing so?

Hello everybody, i have the beyerdynamic dt 770 pro 80ohm version. I have for a long time used the reciever/amp for my speaker system at home, however, i have decided to get rid of these, wherefore i need to get an amp/dac for my headphones. The headphones are primarily being used in my laptop...

What is better an amp/dac with LMH6643 or LME49860 for clarity and sound for sennheiser 598's