First, Response is subjectively defined by me as audibly louder to my ear with clarity.
Next, I have a honda civic 4 door. My sub and port face backwards at the trunk hatch. I have the hatch deadened, its a flat surface.
Will I theoretically experience better response facing the sub/port forward or sub/port backwards facing. Assuming seats up or down for both.
My subwoofer is a 15", it has a few inches between the top of box and bottom of trunk lid. Its about as wide as trunk as well.