A Short Stack is...
a) Made up of wires
b) There are 6 going from the player to the ICBM, and another 6 from the ICBM, 12 total.
c) The wires only run a short length.
Second guess, same as first but:
b) Only 6 wires
Third guess (!), same as first but:
b) 6 from the player and 7 out from the ICBM - the extra supporting the dual sub configuration, 13 total.
Alternatively, a Short Stack is:
a) made of CDs
b) there are several in the stack
c) the stack is short as it contains all the classic Outlaw #1 hits! :-)
Fun fun fun!