Denon AVR-688 Specifications

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AVR-688

AV Surround Receiver

New model information

A/V Surround Receiver featuring HD Video connectivity,

that enhances your level of entertainment enjoyment.

The Latest HD Video Support

• HDMI1.3a switching*

• Deep Color up to 36-bit and xvYCC broader color space support

• Discrete devices for ultimate HD video performance in each block

• 10-bit video encoder and decoder

• 1080p video pass through

MultEQ Auto setup and Room EQ

• New tower type microphone for more

accurate measuring

• Up to six measurement points

• High level resolution filters for satellite

speakers and also subwoofer

Denon Design Solutions for Maximizing Content Quality

• Indentical quality and power for all 7 channels, 110W x 7ch (6 ohms)

• Discrete devices for ultimate performance in each block

• New 32-bit floating point DSP

• Minimum signal path design

• Direct Mechanical Ground for stable drive

• Dual power transformer

• Denon customised block capacitor

• Separate unit design

Compressed Audio Restorer

Denon's new audio technology for MP3/WMA/AAC compressed audio

formats to reproduce higher frequency range and deeper bass sound.

Digital Media Connectivity

• Network Audio/Photo Ready (optional ASD-3N/3W)

• iPod Audio/Photo and Video playback

(optional ASD-1R/3N/3W)

• XM Ready

Ease-of-Use

• Auto set-up and Room EQ, featuring MultEQ from Audyssey

• 3 Quick Select Buttons

• New back panel layout

Multi-Zone Capability

• Two Zone multi-source capability

• Zone 2 audio output

• Power amplifier assign for zone 2

• Remote in/out

Other Features

• Auto Surround Back Channels ON function, for auto-detection of

supporting sources

• Auto Surround mode

• Audio Delay function (max. 6 frames or 200 msec)

• Night Mode for neighbor friendly listening

• Muting level settings (Full/-40dB/-20dB)

• Volume Level Limiter, for setting maximum volume levels

• Power-ON Volume Level Memory

• Variable subwoofer crossover switching

Bullet points

*Shown ASD-3W

*No audio support

Other manuals for Denon AVR-688

Owner's Manual128 pages

Service Manual368 pages

Questions and Answers:

D
Dr. Dylan WilsonSep 6, 2025
How to fix a Denon Stereo Receiver if the power does not turn on?
- T
  Teresa BellSep 6, 2025
  If your device isn't powering on, the power cord connection may be faulty. Check the insertion of the power cord plug.
T
Tami HumphreySep 8, 2025
What to do if no test tones are produced when pressing the TEST button on the Denon Stereo Receiver remote?
- R
  rodney15Sep 8, 2025
  If no test tones are playing, ensure the surround mode is set to “STANDARD” (Dolby/DTS Surround).
R
Ryan MooreSep 10, 2025
Why can't I play my iPod on my Denon Stereo Receiver?
- M
  Mr. Christopher RamirezSep 10, 2025
  If you're having trouble playing your iPod, consider these solutions: * Ensure the input source assigned to Control Dock for iPod is selected. * Reconnect the cable. * Plug the Control Dock for iPod’s AC adapter into a power outlet.

Denon AVR-688 Specifications

General

HDMI Outputs	1
Total Harmonic Distortion	0.08 %
Input Sensitivity	200 mV
Tuner Bands	AM/FM
HDMI Switching	Yes
Power Output (per channel)	90 Watt
Audio Formats Supported	Dolby Digital
Response Bandwidth	10Hz - 100kHz
Input Impedance	47 kOhm
Frequency Response	10Hz - 100kHz
Inputs	HDMI
Outputs	HDMI