DIY: Harman Kardon Software Upgrade for AVR 2600 & AVR 3600 Home | A step-by-step guide to help you upgrade the software on your Harman Kardon AVR 2600 or AVR 3600 receiver.
Harmon Kardon AVR-2600 Solid State Amp Receiver - On Demand PDF Download | English
Harman Kardon AVR 2600 - electronics - by owner - sale - craigslist
Amazon.com: Harman/Kardon AVR2600 7 x 65W 7.1-Channel A/V Receiver (Discontinued by Manufacturer) : Electronics