Harman AVR 510 5.1 Channels Receiver

The way this receiver looked as well as the clean noise free sound it produces sold me on it. Unfortunately, I bought one that had been on display. It has probably been abused. The back light on the remote has never worked and when I turned it on there was a rather loud hum which continued until the unit warmed up. There had been no hum it the ones I listened to at ABC warehouse (where I ended up buying the receiver). ABC warehouse has a very short time limit for returns. Dont buy anything there. Due to the fact that the limit had expired I had to have the receiver sent back to the company to be repaired. The hum was gone when I got it back but they had not repaired/replaced the remote. Needless to say this frustrated me. Even though the loud hum was gone when I got it back there was still more constant noise (low level) than there should be. I still have to have it repaired again. Also the right front channel is louder than the left when all balance control are set evenly for each side. There is also a clicking sound when the volume is adjusted. This is not in the dial alone but occurs even when the volume on the remote is adjusted. I am sure these problems are unique to my unit and do not exist in all of H/K's products. I know this because I have listened to other receivers from them. They do make exceptionally high quality equipment. I agree with the other reviewer who said buy new models only. If you stick with only the newest models you should be very satisfied. I dont think the customer service is anything special so if anything you buy does break beware. It takes about a month to get anything back and the problem might not be fixed even then.