Very lightly used Diamond Audio D6 600.4 surround amplifier. This amp was installed in my show car until I sold the car. Took out my stereo system. I also have a Diamond Audio 1200.1 amp for sale in my other auction. This is a great amp in perfect working and physical condition. This amplifier is sold as is, no returns. What you see is what you get. Thank you for looking and good luck bidding.