In pure audio terms - no. They used an array of $5 drivers that - when set up correctly - gave the listener a 3D effect due to the reflected sound from the back-firing drivers. Or something like that. 
But speakers have come a long way since the 70s.
Ian
__________________
'87 Carrera Cab
----- “Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.” A. Einstein -----
|