Denon AVR-4800 Brochure & Specs page 5

Discrete Power Amplifier Section with
Equal Power and Equal Response In All Channels,
Features THX Ultra Certification
The AVR-4800's all discrete power amp stage features high current,
low distortion power output devices, able to drive virtually any modern
loudspeaker system configuration, regardless of impedance or efficiency.
Lucasfilm's most stringent THX Ultra certification provides your assurance
that the AVR-4800 can deliver the full authority and dynamic impact of
modern motion picture soundtracks in standard and large size home the-
ater environments. The AVR-4800 is equipped with Denon's smart cooling
system featuring a volume and temperature sensing fan, which provides
necessary cooling during extended periods of high power operation, yet is
completely inaudible and unobtrusive during quiet passages.
Robust Power Supply
The THX Ultra-certified
power amp section is
supplied with abundant
reserves of energy due to
the power supply's high
current power transformer,
and large capacity high
Independent Power Transformers Block Diagram
current storage capacitors.
Individual separate power supplies are also provided for the low level
analog and digital circuit blocks, to eliminate mutual interference. THX
Ultra certification assures highest quality sound at virtually any volume
level, from whisper quiet to thundering crescendo.
New D.D.S.C.
(Dynamic Discrete Surround Circuit)
Denon's unique approach to surround decoder design, DDSC-Digital,
employs optimized circuit blocks and elements for each individual surround
decoder function, including highest performance analog-to-digital conver-
sion stage featuring 20 bit precision, dedicated DSP processors featuring
all-digital domain decoding. For the most accurate analog reproduction, the
AVR-4800 features a stereo analog bypass mode, which preserves stereo
analog purity and transparency, while providing digital bass management
accuracy for optimum subwoofer response.
Dynamic Discrete Surround Circuit-Digital Block Diagram
DSP 1 DSP 2
Dolby
THX
Digital
Processor
Digital Pro-Logic
Input Decoder
Digital
Interface
Receiver
DTS Surround
Decoder Simulator
A/D Converter
Analog Input
20-bit
32-bit 32-bit
floating floating
point point
*1. The AVR-4800 is equipped with a 5-channel amplifier. To hear the 6th and 7th channels used by Surround Back, you need to connect an external amplifier such as the DENON POA-5200. The signals for the additional
channels are output through the Pre Out jacks.
*2. When the Surround Back channel is turned off, the AVR-4800 processes the signals in the same manner and gives you the same effects as conventional 5.1-channel signals.
POWER BLOCK
PRE-AMP BLOCK
MAIN
TRANSFORMER
VIDEO BLOCK
DIGITAL BLOCK
SUB
CONTROL BLOCK
TRANSFORMER
- Digital
96kHz / 24-bit
DF 1 DAC L
Front
96 kHz/
DAC R
24-bit
96kHz / 24-bit
DF 2
DAC Center
96 kHz/
Subwoofer
24-bit DAC
2
I S Master
Volume
Interface
96kHz / 24-bit
Control
DF 3 DAC L
Surround
96 kHz/
DAC R
24-bit
96kHz / 24-bit
DF 4 DAC L
Surround Back
96 kHz/
DAC R
24-bit
AVR-4800
Dual Analog Devices SHARC 32 Bit
Floating Point DSP
The heart of the AVR-4800's surround decoder section features two high
speed 32 bit floating point DSP processors, same as used in the AVR-5700,
bringing separates-quality surround decoding performance to the receiver
category. The first DSP performs the Dolby Digital and DTS surround decod-
ing, while the second DSP provides the THX post-processing, Surround EX
decoding, other DSP environment simulations and bass management func-
tions, all in digital domain with the highest accuracy possible.
24 Bit, 96 kHz D/A Converters For All Channels
Unlike conventional A/V components that use integrated low-bit codecs,
the AVR-4800 features highest quality multiple D/A converter chips. Featuring
Analog Devices real 24 bit, 96 kHz D/A conversion on all audio channels, the
AVR-4800 provides separates-quality D/A conversion performance.
THX Ultra & THX Surround EX,
For Accurate Movie Soundtrack Reproduction
The AVR-4800 is the world's first A/V receiver to feature Lucasfilm's
THX Ultra 5.1 post-processing along with the latest Lucasfilm THX
Surround EX decoding function, providing the most accurate reproduction
of the newest multi-channel motion picture soundtracks.
THX Surround EX, developed jointly by Lucasfilm and Dolby, made its
debut in movie theaters with the release of the movie "Star Wars - Episode
1: The Phantom Menace". Featuring a specially-encoded 5.1 discrete
soundtrack, the THX Surround EX function includes a center back surround
channel in addition to the left surround and right surround channels, pro-
viding heightened spatial realism and more convincing surround imaging.
Now that Surround EX-encoded movies are available for home theater
playback, the AVR-4800's THX Surround EX function provides thrilling
home theater surround sound reproduction. Compared to simpler and less
accurate "6.1" unlicensed simulations, the AVR-4800's accurate THX
Surround EX decoding function provides the full suite of required decoding
parameters, and can be automatically or manually selected, according to
the program material characteristics.
In addition, the AVR-4800 surround decoder is DTS ES-compatible,
along with accurate decoding of Dolby Digital and DTS 5.1 channel sound-
tracks, with or without THX 5.1 post-processing.
THX Surround EX Processor Block Diagram
DSP 1
Dolby
Digital
Pro-Logic
Decoder
Crossover
Filter
DTS
Decoder
32-bit
floating
point
DSP 2
Re-
Equalization
Dynamic
Timber
Decorrelation
Matrix Matching
Filter
Circuit
Re-EQ
32-bit
floating
point
F
L
C
F
R
LFE
S
L
S
R
S (S S )
B BL/ BR