I was searching the web for an incident with the DL1608 like this, and it brought me here. Sorry if I'm putting it up again, I just thought that maybe there's already a fix for this at this time.
I'm using the 1608 as a monitor mixer by using an ART S16 XLR splitter. One goes to the FOH and the other to my Mackie Mixer.
Using Aux 1 & 2 for the IEM (In Ear Monitor) and aux 3 to 6 for the stage wedges. After setting up everything, did sound check and calibrating the speakers, everything was working fine. But after about three hours when the band is about to go up the stage to play, for some odd reasons, aux 3 is not receiving any signal. I checked the post/pre fader button, made sure that nothing's muted, checked the four wedges which is linked together as mix 3, pushed up the faders slowly, but still nothing's coming out. The aux 3 master volume is NOT getting any signal even though every channel is receiving constant signals. I even tried to connect the mix 3 monitors to the main L/R output of the Mackie, but still there was no signal coming out. To fix the trouble quickly, I connected the mix 3 to the FOH mixer so the FOH engineer can have control over the mix 3, and it worked.
After the gig, when I got home, I checked the auxes one by one and they were all working fine.
Prior to this about 3 weeks ago, I also had the same problem with auxes 3 to 6. Tried to connect using the L/R output but it still didn't fix the issue.
Does anyone here have any idea why is this happening and what should I do to prevent it from happening again in the future?
Thank you.