The subwoofer in the Bose Infiniti JX audio system is using two 5″ woofers in a cubic enclosure, making use of the Bose Acoustic Wave System technology.
It’s part number is 28170 33C0A. The first part of the code, 28170 is common along the range of spare-tyre/trunk/automotive subwoofers of Bose made for Infiniti/Nissan.