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
B&W XT Series Speaker System and PV1 Subwoofer HT Labs Measures | Sound & Vision
B&W PV1 subwoofer Photo #1289410 - Canuck Audio Mart
B&W Subwoofer PV1 - Previously Enjoyed - AUCKLAND STORE - The Real Music Company
B&W PV1 repair - YouTube
B&W PV1 Subwoofer - Guide for repair - help | AVForums
Hilltop Workshop | Subwoofer teardown and compare. B&W PV1, Velodyne SPL10, and a couple of ferals. - YouTube