rear heat output low

I have always noticed a low output of air/heat from my 1996 Jeep Cherokee in the rear (below the center console). I have to put the blower on max to feel any appreciable air flow and often it is not as hot as the front level. Is this just a design characteristic, or is there something I can do to increase the airflow to the rear?

I have no idea how to check the ducts that get to the rear, so I would be interested if anyone else has checked this.

Thanks

The ducts are simple, they run under the center console. They start right under the dash.