Originally Posted by zaero69
I must be a bit idiot or slow because I still don't get what would be the best settings for a new pair of sennheiser HD595's with 50 ohms.
High Current (9 or 12 Volts) and Low gain (the jumper inside the amp) ?
High current, low gain. If you're going to use USB power, you don't need an ac adapter. Low current mode will extend battery life by reducing the power available to the headphones, but this might still be enough with the 595's to provide good sound quality at normal listening levels. See what your ears tell you...