Bedienungsanleitung Onkyo A-9000R (Seite 5 von 44) (Englisch)

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Technologies

The A-9000R employs a host of proprietary

Onkyo technologies to ensure optimal audio

performance.

Since the advent of digital audio, the values of

S/N (signal-to-noise) ratio have risen

significantly. However, it is also recognized that

in terms of perceived S/N, analog audio sources

are not inferior to digital sources.

Generally, S/N measures the ratio when sound

is and not produced, but takes no account of the

noise generated during sound reproduction.

For a long time, Onkyo has focused and made

extensive research on the S/N when sound is

produced (dynamic S/N). Using a mechanism

that captures the noise beyond audible range, it

has been possible to determine that both

dynamic S/N and perceived S/N aggravate

during music reproduction.

Although frequencies above 20 kHz are beyond

human hearing, it is well known that a beat can

be perceived if different signals are overlapped

at such frequencies.

During the analog audio era, no significant

signals were entering beyond the audible range.

However, the digital era has made recording

beyond the audible range possible and the

generated beat is now perceivable.

With Onkyo’s DIDRC technology, a new

approach is introduced which prevents such

beat from penetrating the audible range.

Conventional amplifiers make extensive use of

negative feedback (NFB), whereby part of the

output signal is re-input in order to improve the

S/N ratio across a wide frequency range.

However, too much NFB makes a system

susceptible to counter-electromotive force from

the speakers, resulting in a drop in perceived

sound quality. To avoid this, Onkyo focuses on

improving the frequency response and reducing

distortion, without relying so much on NFB.

We use a low negative-feedback design

incorporating audiophile-grade, close-tolerance

components, to achieve a frequency response,

out to 100 kHz.

If an amplifier’s ground potential (voltage)

fluctuates during playback, noise is likely to

result. In an open-loop circuit design, where all

circuits wire connected to the power supply via

a single loop (as on many amplifiers), the noise

is compounded. To avoid this, the A-9000R

employs a sophisticated closed-circuit design in

which each circuit has a separate link to the

power supply. This helps to cancel individual

circuit noise and keep the ground potential free

of distortion.

When an amplifier outputs an audio signal, the

connected speakers accumulate energy, reflex,

and send energy back to the amplifier. The

amplifier must then immediately cancel the

speakers’ reflex energy and instantaneously

send out the next signal. The same high current

required to achieve this is also necessary to

handle speaker impedance, fluctuations, which

can force an amplifier to provide four to six

times its usual current load. The A-9000R’s

instantaneous current capability ensures that

audio output is not affected by power

limitations.

Power devices for the left and right channels of

the A-9000R are aligned symmetrically. Each

channel has the same electrical and structural

design, and signal pathways are uniform in

length. This helps to minimize errors in

stereophonic playback.

1. A WRAT (Advanced Wide Range

Amplifier Technology)

– DIDRC (Dynamic Intermodulation

Distortion Reduction Circuitry)

– Low Negative-Feedback Design

– Closed Ground-Loop Circuits

– HICC (High Instantaneous-Current

Capability)

– Symmetrical Twin-Monaural

Construction

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