Yes, there are tubes behind the mids. They appear to go all the way to the back of the cabinets. Caps are ordered. Now I just need to get my GF's car out of my garage so I can start tearing down the cabs. The car is a '98 BMW M-Roadster, so I'm not in that much of a hurry. What a fun car to drive! 280 hp roller skate. One thing I need to figure out is the stuffing. These had poly pillow stuffing inserted at some point, though I can see the evidence of both fiberglass and sheeps wool. I always heard these had long hair sheep's wool for stuffing in the line. Now Jerry at Falcon tells me the very early ones had fiberglass mats stapled to the sides of the lines and very little stuffing. Just figures, I've already sourced a full fleece from some country friends and spent days washing and drying the wool in preparation.