[SOLVED] UR 22 mk II + JBL LSR 305 Speakers doesn't work!

I have connected my newly bought JBL Lsr 305 speakers to the UR mk II sound card, but I can’t hear anything. Headphones work, but not the speakers. I am using AMP TM-3 cables (http://www.musacorner.fi/amp_tm3).

I tried both the -10 dbV and +4 dBu, but none of them work. Which setting should I even use?

SOLVED: I had to disable a playback device I wasn’t using in the volume mixer.