Originally Posted by
planes&trains
For others wondering about this, here is what the manufacturer says. I am packing to return mine as the volume is VERY low, even when source is at max.
That's actually part of the design. The second plug offers a bit of a power boost to the volume. You could probably plug in the two prong and then the airfly after that, that should fix the problem in theory.
I still remember the days (I think it was CX or AC, don't remember which).... every time an announcement was made, the earphones would literally fly out of my ears because the gain was too high. I'd be deaf for the next hour or so.