Onkyo TX-NR646 7.2-Channel Network A/V Receiver User Manual

1. Introduction

Experience the cutting edge of audio with the Onkyo TX-NR646 7.2-Channel Network A/V Receiver. This receiver is designed to deliver immersive sound and high-quality video, supporting advanced audio formats and 4K UltraHD content.

Key Features:

• DTS:X Support: Next-generation object-based surround sound technology for a fully-immersive listening experience.
• Dolby Atmos Support: Up to 5.1.2 Channels for captivating, multidimensional sound.
• High-Current Amplification: 170 W/Ch. (6 Ohms) and 100 W/Ch. (8 Ohms) for accurate and dynamic audio reproduction.
• 4K/60 Hz-Capable HDMI 2.0a: Eight HDMI terminals (7 rear, 1 front) with HDCP 2.2 support for premium 4K/Full HD video streaming and broadcast.
• Wireless Connectivity: Built-in Bluetooth, Wi-Fi, and Airplay for streaming from smartphones, tablets, or PCs.
• Internet Music Services: Supports Spotify Connect, Pandora, and SiriusXM.
• High-Resolution Audio: Features a high-grade 384kHz / 32bit AKM DAC.
• Phono Equalizer Input: Connect a turntable for vinyl playback.

2. Product Overview

Figure 2.1: Front Panel. This image shows the front of the Onkyo TX-NR646 receiver, featuring the main display, volume knob, input selectors, and front panel connections like headphones and an auxiliary HDMI input.

Figure 2.2: Rear Panel. This image displays the rear panel of the receiver, highlighting the extensive array of input and output ports, including HDMI, optical, coaxial, analog audio, and speaker terminals.

Figure 2.3: Remote Control. The included remote control for the TX-NR646, showing buttons for input selection, volume, menu navigation, and playback controls.

3. Setup Guide

3.1 Initial Connections

1. Speaker Connection: Connect your speakers to the appropriate terminals on the rear panel. Ensure correct polarity (+ to + and - to -) for each speaker. The TX-NR646 supports 7.2 channel configurations.
2. HDMI Connections: Connect your video sources (e.g., Blu-ray player, game console, cable box) to the HDMI INPUT terminals. Connect your TV or projector to the HDMI OUT MAIN terminal.
3. Audio Connections: For non-HDMI audio sources, use the optical, coaxial, or analog audio inputs. The dedicated PHONO input is available for turntables.
4. Network Connection: Connect an Ethernet cable to the LAN port for a wired network connection, or ensure the Wi-Fi antennas are properly attached for wireless connectivity.
5. Power Connection: Once all other connections are made, connect the power cord to the receiver and then to a wall outlet.

3.2 Speaker Calibration (AccuEQ)

The TX-NR646 features AccuEQ Room Calibration to optimize audio performance for your specific listening environment.

1. Connect the supplied setup microphone to the SETUP MIC jack on the front panel.
2. Place the microphone at your primary listening position.
3. Follow the on-screen instructions to initiate the AccuEQ calibration process. The receiver will emit test tones to measure speaker distances, levels, and crossover frequencies.
4. Once calibration is complete, save the settings.

4. Operating Instructions

4.1 Basic Operation

• Power On/Off: Press the ON/STANDBY button on the front panel or remote control.
• Input Selection: Use the input selector buttons (e.g., BD/DVD, CBL/SAT, GAME) on the front panel or remote to switch between connected devices.
• Volume Control: Adjust the MASTER VOLUME knob on the front panel or the VOL +/- buttons on the remote.
• Listening Modes: Press the LISTENING MODE button to cycle through various sound modes (e.g., Stereo, Direct, Dolby Atmos, DTS:X).

4.2 Network Features

The TX-NR646 offers various network streaming options:

• Bluetooth: Enable Bluetooth on your mobile device and select "Onkyo TX-NR646" from the available devices to pair and stream audio wirelessly.
• Wi-Fi/AirPlay: Connect the receiver to your home Wi-Fi network. For AirPlay, ensure your Apple device is on the same network and select the receiver as an AirPlay speaker.
• Internet Music Services: Access services like Spotify Connect, Pandora, and SiriusXM through the receiver's network menu. You may need to link your accounts via the Onkyo Remote app.

5. Maintenance

• Cleaning: Use a soft, dry cloth to clean the exterior of the receiver. Do not use abrasive cleaners or solvents.
• Ventilation: Ensure adequate ventilation around the receiver to prevent overheating. Do not block ventilation openings.
• Power Off: Disconnect the power cord from the wall outlet if the unit will not be used for an extended period.

6. Troubleshooting

Common Issues and Solutions:

• No Sound:
  • Check speaker connections and ensure they are securely attached.
  • Verify the correct input source is selected.
  • Increase the volume level.
  • Ensure the Mute function is not active.
• No Picture:
  • Confirm HDMI cables are securely connected to both the receiver and the TV/source.
  • Ensure the TV is set to the correct HDMI input.
  • Check if the receiver's HDMI output is set correctly.
• Network Connection Issues:
  • Restart your router and the receiver.
  • For Wi-Fi, ensure the receiver is within range of your wireless router.
  • Verify network settings in the receiver's menu.

For more detailed troubleshooting, refer to the complete User Guide.

7. Specifications

8. Warranty and Support

For detailed warranty information, please refer to the warranty card included with your product or visit the official Onkyo website.

For further assistance, technical support, or to download the full user manual, please visit the Onkyo support page or contact their customer service.

You can also download the comprehensive User Guide (PDF) for the Onkyo TX-NR646 from the following link: Download User Guide (PDF)