EA VL-210 Prototype Question

Anyone ever seen one of these before? It's a prototype of the original EA VL-210, bought off the floor at a NAMM Show/Anaheim years ago, but this has 2X10's, 4X5's and a horn. It has the recognizable 3-way EA crossover but my question is....... does anyone actually know what the impedance of this cab may be??

The S/N notes this as a prototype, so there is not literature to refer to. Any help would be appreciated. Ken

BTW, The pic is a music store link but I bought it from the original owner, whom I've known for over 40 years. KWS

SEVEN drivers is a 2X2 cab! "HE IS HEAVY, HE's MY EA".

http://www.parkwaymusic.com/amps/images/thumb_EA_IL210_21PT04.jpg