Denon AVR-684 User Manual

NEW MODEL INFORMATION

Dolby Digital and DTS A/V Receiver

AVR-684

DTS-ES Discrete 6.1 and Dolby Digital EX with Power Amps for 6 Channels

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DENON's Basic Design for High-Quality Sound Reproduction
Power Transformer for High Power Driven

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The chassis that supports the large transformer
has been designed to absorb vibration, and the
transformer is housed inside a highly rigid frame
to secure it more solidly to the chassis. In addition,
a cushioning material has been placed around
the core of the transformer to minimize interference
on the signal and enable more faithful reproduc­tion of the original sound. The AVR-684 inherits
these low-noise design from higher-end models
not to mention the use of short ring.

Twin Drive Rectifier

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DENON's Twin Drive Rectifier design uses two rectifying diodes in parallel
to bring out the maximum potential of the large transformer. Since the
rectifiers recharge the large block capacitors at low impedance, they
are able to supply ample current to reproduce deep basses as well as
sudden bursts of sound from percussion or other musical instruments.

Large Aluminum Extruded Heatsink

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DENON uses large heatsink made of extruded alu­minum. They have been placed in a design that
ensures mostly uniform temperatures throughout
the heatsink so that the output transistors for all
channels can be driven under uniform conditions.
This in turn ensures that all channels respond
with equal performance to the demands of the
audio signals.

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Fully Discrete, Equal Power Six Amplifier Channels, 110 Watts Each

Front 110 W + 110 W (6 ohms, 1 kHz, 0.7 % THD)
Center 110 W (6 ohms, 1 kHz, 0.7 % THD)
Surround 110 W + 110 W (6 ohms, 1 kHz, 0.7 % THD)
Surround Back

For optimum Dolby Digital and DTS reproduction, the AVR-684 features
high quality, wideband audio amplification, providing 110 watts power
output for each of the six main channels.
A large capacity power supply includes a high current power transformer
along with discrete power output devices on all six amplifier channels for
highest dynamic range and superb reproduction clarity.

110 W (6 ohms, 1 kHz, 0.7 % THD)

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32 bit High Quality DSP

A-high -quality 32-bit DSP “MELODY 32” from Analog Devices has been
used in the DSP processor, placing the AVR-684 at a higher rank than
other models of this class in its ability to accurately decode and reproduce
the superior quality of surround sources.

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24 bit, 96 kHz High Resolution D/A Conversion

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Wide-Range Play Capability for DVD-Audio and Super Audio CD

The power amp circuits of the AVR-684 have been meticulously designed to
reproduce the exceptionally high sound quality with wide frequency
response from 10 Hz to 100 kHz.

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Cinema Equalizer

The sound from movie sources recorded in Dolby Digital, DTS or other
formats emphasizes high-frequency range due to a theater’s front
speakers being placed behind the movie screen. If this sound is repro­duced in the home theater without correction, the high-frequency range
is too strong. The AVR-684 features a Cinema Equalizer to correct
these high-frequency components so that the sound is clearer and
easier to listen to. (For Dolby Digital, Dolby Pro Logic II, Dolby Digital
EX and DTS surround modes)

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Personal Memory Plus, for Easy Operation

The AVR-684 includes the Personal Memory Plus function that auto­matically remembers the surround mode you last used for each program
source, so that you do not need to select the mode again for that program.

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Acclaimed Customization Feature

As with all of DENON’s high-grade A/V receiver, the AVR-684 lets you
adjust delay times and other parameters so that you can customize the
performance of the AVR-684 to suit your own home theater and
enhance operating ease. The adjustments are easy to make via a dialog
format on the fluorescent display on the front panel. These customized
features are then stored, for each source input and surround mode, in
Personal Memory Plus so constant readjustments are not required.