Fiat stilo Hi-Fi ~500 Euro?

I saw an optional HI-FI system for fiat stilo that costs ~500 euro. It seems that it is composed of 8 speakers and a subwoofer? Anyone knows of what brand is it? Is there an amplifier? (it should be,
there's a woofer and a CD player in car is too weak to make it work) Where is subwoofer settled in car and where is amplifier?
Tnx in adv. Sharky
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