while unscrewing the gear surround in the s14a this evening, i found this box behind the centre console, it lookes to have phone line style ports on it and one of the leads even looked like a phone/moden style flat cable.
it also had 2 plastic dials that youd adjust with a small screw driver.

couldnt make out the marking on it though.
it was right in under where the back of the ash tray and cig lighter would be sitting on the trans tunnel.

took a pic of a few bits of loom that where visable in the slot for the radio aswell as the plug on the box had wires of the same colour as some of these but didnt have time to look any further into it. there was 3 lables on the loom here aswell, one with FR, one with FL and one with REAR on it.