So I've bought a Fulla 2 to be able to connect both my lsr 305s and hd598s. I'm using it on a desktop pc, connected it through a front panel usb port (USB 3.0/2.0) both cause the same issues.). Speakers are connected with a 2x1/4'' to 1x1/8'' cable to the Fulla's variable pre-amp out. The...

It's my first post so hi everyone! I need an amp/DAC combo to connect both my HD598s and LSR305s. The cans were fine with the on-board audio (mobo is an Asus maximus v formula- has a glorified ALC898 iirc.) but since the addition of speakers, I've been getting horrible noise when using the...