I just wanted to let you know that I sent back the unit. I received another one.
Same problem! Far too little output power provided by the headphone amp.
Another thing I recognized. You are recording noise. It sounds like a computer writing files on a harddisc. At first, I thought that it is only audible on the main ouputs. But then I exported the file to the computer and the noise is still there. It has a low level of course, you can only hear it when you crank up the volume of your speakers, but it is a no-go in my opinion. I recorded to a Samsung M3 Portable.
So I also sent back the second unit and reinstalled my good old Fostex D2424LV.
It is too bad that this thing didn’t suit my needs. I also would have loved to get better help from the company.