Yeah, so as the title states I have Ultrasone Pro 900's (loving them btw) and a Focusrite Saffire 6 interface that I use for production and DJ'ing, which has a headphone amplifier built into it. I believe the headphone amp in my Saffire 6 is on the weaker side but still sounds excellent, I just have to turn it up to 8/10 to get a decently loud output (pretty much my max listening level).
Do you guys think it would be worth it to buy a separate headphone amplifier, such as the E9 or E11 or something of that nature? Will there even be a difference or will it just be a waste? I'm thinking i should probably just stick with my Saffire 6 and just turn it up to 8/10 if I have to.
Also, if I were to get a separate headphone amplifier, how would I hook it up to my Saffire 6 as the source?