Location of Ford Amp on EF/EL
This is the location of the ford amp for the premium sound system.
Also, there were 3 types of Audio systems fitted at the factory.
Low Series, fitted to Gli and Futura
Mid Series, fitted to Fairmont, Fairlanes
and Premium, Fitted to Fairmont Ghia, Fairlane(Option) and LTD.
The Mid Series one could have an optional CD stacker, same one as the premium system.
Its easy to tell if you have the premium system fitted to an EF/EL, as the Deck is a double DIN, the others are single DIN.
As far as Im aware, the cabling for the CD stacker was fitted to all Mid series systems, so it was a matter of fitting the Stacker at a dealer.
With the High Series, the rear speakers are connected to the amp, but there are existing connectors there to connect the rear speakers to the Head unit. These though are not used by the head unit, but the wiring still exists.
Finally about the Ford amp.
It has 4 RCA Inputs, and 4 channels out. Each output is already bridged, (IE, you cannot bridge the outputs to get more output).
Only 3 outputs are used on the premium system. 2 for 6" speakers, and 1 for the Sub.
The amp is rated at 200Watts, (obviously not RMS), and is a class AB design. - I.E. sounds awful at low volumes with its inherent crossover distortion !!!!!
IMO, the Deck was by far and away, the best feature of the Premium sound system, the sub, and amp were more of a no-frills addition.