30
Receiver Features
(SA-XR57)
32-bit Floating Point DSP
The SA-XR57 incorporates a 32-bit Floating Point Digital Signal
Processor. Boasting exceptional speed and precision, this advanced
processor decodes Dolby Digital EX, DTS-ES and other surround
sound signals quickly and accurately to deliver a stunningly lifelike
surround performance. Also, an A/D converter converts analog
signals to 192-kHz/24-bit digital signals, then
applies 32-bit DSP processing. This gives you
an extremely high-quality sound even when
playing conventional analogue sources.
Pure Water Capacitor
A Pure Water Capacitor containing a rayon separator is used as the
electrolytic capacitor for each of the seven audio channels. With its
high water content this capacitor offers
excellent electrical characteristics and low
impedance. The clean electric current it
delivers to the speakers helps achieve a clear,
transparent sound.
MOS-FET
The power amp section is equipped with newly developed,
half-bridge MOS-FETs, which assure high conversion efficiency and
excellent audio characteristics. Also, by integrating the conventional
four MOS-FETs per channel to two per
channel, we downsized the circuitry and
shortened the signal path. The result is a fast,
powerful speaker drive that delivers highly
linear, true-to-life musical reproduction.
192-kHz/24-bit A/D Converter
This converts analogue signals to digital signals and delivers them to
the 32-bit DSP, giving you maximum benefit from the digital amp and
digital functions even when playing analog sources.
Technologies that Zero in on Sound Quality
Full-Digital Processing
Our amplifiers use digital processing from signal input all the way
through to output. Their amazing amplification lets you enjoy the
full potential of today's most advanced audio sources such as
DVD-Audio. And because our amplifiers are compatible with
sampling frequencies up to 192 kHz, you can enjoy faithful
reproduction of analog audio signals converted into 192-kHz/24-bit
signals so you won’t lose any of that great, original sound.
Low Noise, Low Distortion
Panasonic and Texas Instruments developed technology that helps
eliminate the distortion that occurs in PCM-to-PWM conversion, to
help prevent a loss in stability. Our amplifiers boast 98-MHz
processing. They incorporate 4-dimensional noise-shaper
technology to reduce noise as well as, feed-forward error correction
to ensure ultra-low distortion, even in high-frequency sounds. They
also offer a VGDA (Variable Gain Digital Amplifier) function that
improves the S/N ratio so you enjoy superb sound even when
listening at low volume.
High Efficiency, High Power
An advanced switching amp control method called dead time control
combines with a serial snubber circuit to help conserve electric
power at the output stage. This super-high efficiency not only helps
save energy and helps reduce heat generation, it also helps ensure a
stable, high-quality sound. Our amplifiers are built for power, too.
Pumping out 100 watts/ch* over 7ch – incredibly high output for
amplifiers this slim – they let you enjoy the breathtakingly beautiful
sound inherent in DVD and other multi-channel sources.
* 1kHz, 6ohms, 0.9% THD
Advantages of the Digital Amp
The SA-XR57 achieves superb reproduction by making it possible
for two amps to drive ordinary (non-biwired) speakers connected
via a single speaker cable. Conventional multi-channel amps use
only one amp per speaker in 2-channel playback, and the surround
channel amp is not used at all. But in the SA-XR57/55, Panasonic
has applied original technology that takes full advantage of the
characteristics of digital amps, completely synchronising the two
amps in parallel so that they can drive a single speaker using the
ordinary connection method. This capitalizes on the outstanding
response of the digital amp, while the double drive power adds
richness and depth. The dual amp drive system automatically
activates for 2-channel sources and then resumes ordinary drive
for multi-channel sources. There is no need to change speaker
cables to match the source.
Difference of Power Bandwidth
(Power)
(frequency)
20kHz
0dB
50kHz
70kHz
100kHz
88kHz
Regular
Analog
Top End
Analog
Panasonic Digital Amplifier
High Quality Dual Amp Drive Reproduction
Dual Amp Drive
Triple Amp with Bi-Amp/Bi-Wiring Drive
When using bi-wired speakers
with the SA-XR57/55, each
speaker is driven by three amps
for even higher sound quality.
This bi-amp system drives the
treble range with a single amp
and the bass range with dual
amps, using a total of six amps
for high stereo fidelity.
Wide Frequency Range, Wide Power Bandwidth
Panasonic digital amplifiers boast a high frequency response up to
88 kHz and a wide power bandwidth with low distortion. And they
drive the entire frequency
range - something analogue
amplifiers cannot do. The
results are amplifiers that
clearly reproduce even
high-frequency sound
components 20 kHz and
above, and unleash the
remarkable sound potential of
DVD-Audio and other
advanced sources.
5.1ch with Dual Amp Drive (Advanced Dual Amp)
The SA-XR57 also uses its dual amp drive system to drive the left
and right front speakers in 5.1ch playback mode. This enhances
realism and ambience in movie soundtracks by delivering
high-quality sound from the left and right front channels that play
such an important role in reproducing movie sound effects and
background music.
Auto Speaker Detector
The Auto Speaker Detector function detects the connected speaker
system and automatically adjusts the settings. The SA-XR57 is set
for 7.1ch at the factory. If it is connected to a 5.1ch speaker system,
the Auto Speaker Detector function will automatically switch the
setting to 5.1ch. This prevents improper sound ambience due to
incorrect settings. This function can also be used to check for a
loose cable or a faulty connection when there is no sound output
from a specific speaker.
Conventional Two-Channel Reproduction
Amp
Amp
Amp
Amp
Amp
Amp
Amp
FL
LS
SBL
FR
RS
SBR
C
Digital Amplifier
Left Speaker
Right Speaker
Two-Channel Reproduction with Dual Amp Drive
FL
LS
SBL
FR
RS
SBR
C
Digital Amplifier
Left Speaker
Right Speaker
Amp
Amp
Amp
Amp
Amp
Amp
Amp
FL
LS
SBL
FR
RS
SBR
C
Digital Amplifier
Left Speaker
Right Speaker
Amp
Amp
Amp
Amp
Amp
Amp
Amp
Two-Channel Reproduction with
Triple Amp Bi-Amp/Bi-Wiring Drive
