I opened up few subwoofers to look inside. A B&W PV1, a Velodyne SPL10, and a couple of no-names. Hope you find it interesting. :) - Speakers, Soundbars and Subwoofers - StereoNET International
Bowers & Wilkins PV1D (Matte Black) Powered subwoofer with digital processing and touch-panel controls at Crutchfield
B&W Bowers & Wilkins PV1 home cinema Subwoofer goes nuts! Test and reviews! - YouTube
B&W PV1 Subwoofers user reviews : 3.9 out of 5 - 8 reviews - audioreview.com
B&W PV1 Subwoofer - Guide for repair - help | AVForums
Bowers & Wilkins MT-60D review | Home Cinema Choice
A comparison of the best subwoofers of 2020 - Son-Vidéo.com: blog