Technology
A WRAT (Advanced Wide Range Amplifier Technology)
The M-5000R employs a host of proprietary Onkyo technologies to ensure optimal audio performance.
1.DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
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.
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2. Low Negative-Feedback Design
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.
3. Closed Ground-Loop Circuits
If an amplifier’s ground potential (voltage) fluctuates during playback, noise is likely to result. In an open-loop circuit design, where all circuits (ire connected to the power supply via a single loop (as on many amplifiers), the noise is compounded. To avoid this, the M-5000R 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.
4.HICC (High Instantaneous-Current Capability)
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 M-5000R’s instantaneous current capability ensures that audio output is not affected by power limitations.
Quad Push-Pull Amplification Design with Three-Stage Inverted Darlington Circuitry
Three-Stage Inverted Darlington Circuitry brings greater efficiency to the M-5000R power amp by employing a low-NFB design to maintain voltage stability and enhance transient response. Extremely sensitive to oscillations, this circuitry requires very advanced control technology in order to be incorporated into the amplifier. Breaking further new ground, the M-5000R employs two extra transistors for each channel in a “quad push-pull” design that significantly enhances amplification power.
Symmetrical Twin-Monaural Construction
Power devices for the left and right channels of the M-5000R 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.
Side-mounted Circuit Board Construction
Rather than being directly connected to the chassis base, the circuit boards inside the M-5000R are cushioned by internal struts and affixed to the front, side, and rear panels. This method of construction prevents vibrations from the chassis from adversely affecting the circuit boards.
