Where do you get this 86 dB from? Spec is "Maximum short term sine wave SPL output averaged from 30 to 85 Hz, measured in half space at 1 meter: 103 dB". Since the port is the highest output on the frequency response (excluding LFE channel), it's at least 103 dB at 30 Hz. Remove 6 dB for the half-space gain and you're still at 97 dB.
Not that I don't acknowledge the fact that the 7x50 serie is for nearfield.
Looking at the FR vs SPL graph on their detailed spec sheet at 30 Hz is where I got 86 db. I don't understand how they get from the results on their graph to the 103 dB number but I may not be looking at it correctly. https://www.genelec.com/7050c#section-technical-specifications