Well here are my thoughts. A short stack means 2 pancakes. Thus you need 2 of something. I assume that the ICBM is some sort of bass management control for DVD-A. The short stack I'm assuming is an interconnect that bundles 6 coax into one connector. Say a firewire connector. Thus you need a short stack(2 of the interconnects described above) to connect the DVD-A to a Pre/Pro withe ICBM in the middle.