Onkyo TX-NR905 - Manual (Page 2)

1080p Video Upscaling and Analog Signal Conversion to HDMI
or Component Video
The TX-NR905 will upscale the resolution of all analog video signals to 1080p,
for delivery via HDMI to a high-definition display. Before being outputted, scaled
images are sharpened through high-quality HQV Reon-VX video processing.The
TX-NR905 also features HDMI and component video upconversion for
bandwidths up to 100 MHz, to enable convenient single-cable output of all your
video sources, from DVD recorders and players to satellite cable boxes.
Audyssey MultEQ XT for Powerful Room Acoustics Correction
MultEQ XT is Audyssey’s most powerful built-in
solution for countering distortion in dedicated home
theaters.This technology detects speakers, and then
sets levels, delays and crossovers, as well as measuring room acoustics. When
engaged through the receiver interface, it takes up to eight measurements
around the listening area and uses high-resolution equalization filters for satellites
and subwoofers. MultEQ XT covers both frequency response and time domain
(where most of the problems lie) across the entire listening area.The results are
immediately obvious—a clear, well-balanced and natural sound.
Fresh Approach to the Internal Construction of A/V Receivers
Our design philosophy for the TX-NR905 is based on a
consideration of how each individual part interacts with the
others and affects audio and video performance.The end
result is a receiver where the power amplifier block and the
pre-amplifier coexist, but are perfectly isolated. Also, separating
the power supply parts of the left and right stages of each channel
has been shown to improve articulation.Taking it even further, the circuit boards
have been affixed to the chassis so that vibrations from the base are suppressed.
As Onkyo’s flagship model for the high-
definition era, the TX-NR905’s focus on
quality is galvanized by gold-plated audio
inputs, a brass bus plate for perfect
grounding and customized, gold-plated
speaker posts.
Dual Push-Pull Amplification Design with Three-Stage Inverted
Darlington Circuitry
The TX-NR905’s dual push-pull
amplification design uses different
transistors on each channel to
separately amplify the positive and
negative halves of the waveform.
Meanwhile, three-stage inverted
Darlington circuitry helps reduce
distortion at the output stage.The
whole design works to realize a highly efficient drive capability.
Bi-Amping and BTL (Bridged Transless, or Bridging) Capability
Taking a cue from the
world of high-end
audio, the TX-NR905
allows for a number
of different home
theater set-ups
beyond the standard
surround sound
configurations.
Compatible front
speakers can be bi-amped for separate tweeter and woofer inputs, enabling
improved bass and treble performance. Bi-amping works with a 5.1-channel
surround configuration. Alternatively, bridging enables you to double the power
output to compatible front speakers for a 2.1-channel set-up (i.e., front speakers
and a subwoofer).
Harnessing Power for Audio Performance
The TX-NR905 is driven by a massive
toroidal transformer that provides
efficiency and radiates less noise into the
surrounding circuitry.This transformer
drives the audio amplifier, while two
separate transformers cater specifically to
the heavy demands of high-definition
audio formats (DTS-HD
Master Audio and Dolby
TrueHD) and video
processing (HQV Reon VX).
You’ll also find two quality capacitors
(operating at up to 18,000 microfarads) that can store the
charge expected from an effective power supply.
Wide Range Amplifier Technology (WRAT)—
A Total Design for Amplification Power
Uncommonly Low Negative-Feedback
Design—Get cleaner sounds on
program peaks
Negative feedback (NFB) is the
most cost-effective way to
reduce noise at lower
frequencies, but it will severely
inhibit an amplifier’s ability to
respond to musical crescendos
and to produce sound at high
frequencies. We use a low
negative-feedback design with
audiophile-grade, close-
tolerance components at
critical points in the signal path.
This design achieves a
frequency response out to
100 kHz for high-definition and
regular DVD formats, high-resolution DVD-Audio and Super Audio CD, regular
CDs, digital music files and the latest gaming software.
Closed Ground-Loop Circuits—Enjoy distortion-free audio at any
volume
If an amplifier’s ground
potential (voltage) fluctuates
during playback, you can expect
noise. In an open-loop circuit
design, where all circuits are
connected to the power supply
via one loop (as on many
amplifiers), the noise multiplies
exponentially. Onkyo’s
sophisticated closed-circuit
design enables each circuit to
go and return directly to the
power supply, which cancels
any individual circuit noise and
keeps the ground potential free
of distortion.
High Instantaneous-Current Capability—Experience home
entertainment with greater impact
After an amplifier outputs
an audio signal, the
speakers accumulate
energy, reflex and send
energy back to the
amplifier.The amplifier
must immediately cancel
the speakers’ reflex energy
and instantaneously send out the next signal. A high current is necessary to
handle speaker impedance fluctuations, which can force an amplifier to provide
four to six times its usual current load.The instantaneous current capability of
even Onkyo’s least expensive WRAT receivers exceeds that of most
conventional units, which commonly have less than half the current capability. An
Onkyo receiver will deliver movie soundtracks with cinema-standard dynamics
and clarity.
Sound stage is diffuse without Audyssey technologies. Audyssey technologies create a clearer sound stage.
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