I was going to post a picture but thought I better not divulge any industry secrets - but I just got done installing TWO subwoofer cabinets that contain a 30” speaker each. Each box is about as tall as an upright piano and about 30” deep. Both are actually situated in a way that they’re strapped together with the speakers facing each other at a 45-degree angle. They have to be strapped together because when you start playing sound through them, the vibrations will make them walk away on their own!
Man and I thought the 18” sub I bought for my personal PA system was big and heavy.
big bottom exists - these speakers will probably vibrate the listeners to vomiting