SOLVED: Left side not working at all for Bose QC25 - Bose QuietComfort 25 - iFixit
Amazon.com: Bose QuietComfort 35 II Noise Cancelling Bluetooth Headphones— Wireless, Over Ear Headphones with Built in Microphone and Alexa Voice Control, Silver : Electronics
Bose QuietComfort 45 Review: More (And Less) Of A Good Thing | Digital Trends