Originally Posted by stockjock
Okay, should I assume that the AVR3600 or even AVR2600 (for example) has a better amplifier than my AVR520 since it has a lot more current and is US designed? Or is that not correct?
No, your avr 520 is actually stronger than both the 3600 and 2600.
Specs: avr 520 85 x2, 75 all channels driven, 45 amp HCC, 35lb
avr 3600 80x2, 60 all channels driven, 35 amp HCC, 31.5lb
avr 2600 65x2, 55 all channels driven, 35 amp HCC, 26lb
Old school of thought is the heavier the receiver, the bigger the power supply, heatsinks, etc. The 3600 is the closest to the power of your 520 with most of the modern features (hdmi, dolby volume, dolby true hd, dts master, high def on screen display with overlay). The more recent HKs (avr 2650, 3650, 2700, 3700) really aren't even TRUE high current amplifiers any more. The HCC spec with those are probably marketing fluff now. Harman Kardon is no longer what they used to be.....