Denon AVR-688 AV Receiver Owners Manual

The Denon AVR-688 is a versatile AV receiver that supports various audio and video formats, providing an immersive home theater experience. It features multiple HDMI inputs, Dolby Digital and DTS decoding, and advanced audio processing capabilities. Below are key sections for safety, features, installation, setup, operation, and troubleshooting.

1. Features at a Glance 2. Installation 3. First-Time Setup 4. Specifications 5. Controls and Settings 6. Connecting Devices 7. Playing Audio/Video Media 8. Accessibility Features 9. Care & Cleaning 10. Regulatory Information 11. Troubleshooting

Features at a Glance

Key components: HDMI inputs, Dolby Digital and DTS support, AM/FM tuner, remote control, and various audio processing modes.

Feature	Description
HDMI Inputs	Multiple inputs for connecting various devices
Dolby Digital	Supports surround sound formats for immersive audio
DTS	Decodes DTS audio formats for high-quality sound
AM/FM Tuner	Built-in tuner for radio reception
Remote Control	Convenient control of receiver functions
Audio Processing Modes	Various modes for different listening experiences

Installation

Unpack and inspect contents. Place the receiver on a stable surface.

Connect speakers: Use appropriate speaker wire for connections.
Connect video sources: Use HDMI or other inputs for video devices.
Plug into AC power.

WARNING! Ensure all connections are secure to avoid damage.

First-Time Setup

Power on the receiver; follow on-screen prompts.

Set up speakers: Use the setup menu to configure speaker settings.
Program channels: Use the tuner to scan for available radio stations.
Adjust audio settings: Access the audio menu for sound adjustments.

CAUTION! Ensure stable surface; avoid overheating.

Specifications

Power Output: 75 watts per channel (8 ohms).
Audio Formats: Supports Dolby Digital, DTS, PCM.
Video Inputs: 4 HDMI inputs, composite, component.
Audio Inputs: Optical, coaxial, analog inputs.
Weight: 20 lbs.
Dimensions: 17.1 x 13.4 x 6.3 inches.
Power Consumption: 300 watts maximum.

Controls and Settings

Access settings via the on-screen display (OSD) or front panel controls. Remote includes power, volume, input selection, and audio mode buttons.

Audio Settings: Adjust bass, treble, balance, and surround settings.

Connecting Devices

Connect various audio and video devices using HDMI, optical, or analog inputs.

Turn off the receiver and devices before connecting.
Match cables to ports (e.g., HDMI to HDMI).
Select input via remote or front panel.

Tip: Ensure all devices are powered off during connections.

Playing Audio/Video Media

Supports various audio and video formats.

Select input: Use the remote to choose the desired input source.
Play media: Use the connected device's controls to play content.
Adjust volume: Use the volume control on the remote or front panel.

WARNING! Do not overload the receiver; ensure proper ventilation.

Accessibility Features

Closed captions and audio descriptions can be enabled through the settings menu.

Care & Cleaning

Unplug before cleaning. Use a dry cloth only; avoid liquids or aerosols.

CAUTION! Do not spray liquids; keep away from heat and moisture.

Regulatory Information

This device complies with FCC regulations. For support, visit www.denon.com or contact customer service.

Troubleshooting

Symptom	Possible Cause	Corrective Action
Remote does not work	Obstacles/batteries	Remove obstacles; replace batteries.
No sound	Connections/mute	Check connections; ensure mute is off.
Picture not clear	Settings	Adjust video settings in the menu.
Channels not programming	Antenna/menu	Ensure antenna is connected; use auto-program.

Reset: Menu > System > Reset if available.

Service: Visit www.denon.com for support.