Gemini headphone audio output levels

I’m finding the headphone audio output levels on my Gemini to be exceeding low volume. I’ve tried both the 1/4" and 3.5mm sockets and the volume levels are the same.

I have the master volume at max and the audio output is so low. I wonder if there is an impedence mis-match or someting I’ve missed? Anyone experience the same?

I’m using high quality Sony Studio monitor headphones and have tried others with the same result.

I have Sony MDR 7506s and it pushes them fine