Hi Catman - I've just stripped out and replaced my Auditorium 200 from my 3200Gt - not sure if it is identical, and I'm not sure exactly what made up the 'Auditorium 200' extras, but mine had 4 front door speakers (2 x doors & 2 x tweeters near vents as you noted), 2 rear seat speakers under rear windows and 2 speakers behind the headrests of the rear seats. It was all sent through an amplifier located behind the battery in the boot compartment, with an additional CD changer in the spare wheel spot (prior to it filling with water and rendering redundant). As mentioned earlier in this topic, it also says 'Auditorium 200' on the front door speaker covers too. Hope that helps.