I have a 12 inch diameter subwoofer type speaker flush mounted on the right hand side (driver's) in the boot of my Legnum. It is quite near the panel where you access the AYC. Would this be a stock standard item? Was just wondering, because some members have queried it in the past. It looks very OEM in black though, so I reckon it has to be.
The sound system in the car is the factory double din tape and radio (have an FM band expander on the radio), with a 10 CD changer also in the boot on the opposite side to the sub speaker.