Harman Kardon Avr 51 User Manual 134 Better -

The manual’s formula for surround delay is: (Distance to surrounds) – (Distance to fronts) x 1.1.

| Feature | Official spec | Reality | |---------|--------------|---------| | Power | 5 x 50W (20-20kHz, 8Ω) | Realistic: ~40W/ch all channels driven | | DAC | Analog Devices | 24-bit/96kHz for stereo, 48kHz for DD/DTS | | Sub crossover | Fixed at 100Hz | Cannot adjust – sub’s own crossover must be set to 100Hz or higher |

Some AVR 51s have Zone 2 analog out – powers another room’s stereo amp. Original manual buries this. harman kardon avr 51 user manual 134 better

Press Bypass button – disables bass/treble, shortens signal path. Good for critical CD listening.

The AVR 51 is high-current, but heat is its enemy. The manual’s formula for surround delay is: (Distance

If you connect your DVD player to Optical 1 but press the "DVD" button and hear silence, the input is not assigned.

Do not pay for a scanned copy on eBay. Harman Kardon’s legacy support is still available, but you have to look in the right place: Some AVR 51s have Zone 2 analog out

Pro tip: Download the PDF and save it to your phone. When you are behind the receiver with a flashlight, searching “digital input assign” on your phone is faster than flipping paper.

The “No Sound” problem. You turn on the AVR 51, it powers up, but no audio comes out.

The 134-page manual explains that this receiver has multiple digital and analog inputs that are not automatically linked. You must manually assign, for example:

Without the manual, you will never find the hidden menu (press the “Input Select” button on the front panel for 3 seconds) that lets you change these assignments.