Behringer DCX2496 blues

Okay, I'm officially an idiot - several times over. (Should have posted my issue on here a long time ago ....) My outputs #2 and #4 (left channel LF and HF) were on A. A quick switch to B and voila ...
You guys were right, so big thanks to Conanski and MikeATX. I was stuck on A as an input and never thought of another channel ....
Nah, the dcx manual is anything but understandable. The front panel display offers more clues than the manual. I'm not too surprised, for its time, it was a unbelievable value, so no money was spent on a manual. Now of course things have moved on and that level of compute is everywhere. I am proud to say I helped in the chip design of the SHARC though, so as soon as they came out around 2 decades ago I had to have one to use for a crossover. I've got 4 now, 2 for the HT and 2 now retired for the stereo.