[LAU] RME analog out of phase to ADAT connected Behringer analog out

Hi, I made a sound check, that isn't a valid test, just a test to get a coarse impression, but it's positive that for the 'RME analog out / ADAT out test' the signals were out of phase. Shaking the Tree - Youssou N'Dour & Peter Gabriel Uncompressed 16-bit PCM audio Stereo 44100 Hz Linux Player Totem RME HDSPe AIO analog out compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound differs after adjusting levels Linux Ardour RME HDSPe AIO analog out compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound nearly equal after adjusting levels Linux Ardour Terratec EWX 24/96 analog out compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound nearly equal after adjusting levels Linux Ardour RME HDSPe AIO --> Behringer Ultragain Pro-8 compared with CD Player Pioneer PD-4700 Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound nearly equal after adjusting levels Linux Ardour RME HDSPe AIO --> Behringer Ultragain Pro-8 compared with Linux Ardour RME HDSPe AIO analog out Behringer Eurorack UB2442FX-PRO Headphones AKG K 240 DF sound audible out of phase between RME and Behringer, what ever sync settings I tried, while the RME always was master This is what I would expect, but I was told that there should be no additional latency. Is this a sync issue? Regards, Ralf