Harman Kardon AVR 430 7.1 Surround Sound Receiver for Sale in Newport Beach, CA - OfferUp
Harman Kardon AVR 137 5.1 Reciever met Radio | Jouw2dekans
Harman kardon 7.1 channel AV Receiver Amplifier for ur Speakers, Audio, Soundbars, Speakers & Amplifiers on Carousell
Harman Kardon AVR 635 7.1 Receiver; Superb condition with all accessories, original carton Photo #1472064 - US Audio Mart
Harman Kardon HK3380 Component Stereo Receiver | Digital Stereo Amplifier
Harman Kardon AVR 3700 7.2-channel home theater receiver with Wi-Fi® and Apple® AirPlay® at Crutchfield
Basically, all Harman Kardon amplifiers (including subwoofers) show power supply issues after a few years « The Wiert Corner – irregular stream of stuff