AMPLIFICATORE INTEGRATO 2 CANALI ONKYO A-9000R.COLORE SILVER

AWRAT (Advanced Wide Range Amplifier Technology)
The A-9000R employs a host of proprietary Onkyo technologies to ensure optimal audio performance.

1. DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
Despite being beyond the normal range of human hearing, frequencies above 100 kHz are susceptible to clock pulse and other forms of distortion from digital devices. Such distortion in the super high frequency range can generate “beat interference”, which in turn affects the character or atmosphere of the original sound. By improving linearity and reducing distortion in the super-high frequency range, Onkyo’s new DIDRC technology effectively reduces perceptible noise.

2. Low Negative-Feedback Design
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.

3. Closed Ground-Loop Circuits
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.

4. HICC (High Instantaneous-Current Capability)
Handling current loads up to 140 amperes, HICC enables an amplifier to immediately cancel the speakers’ reflex energy and instantaneously send out the next signal. The same high current required to achieve this also supports the amplifier’s ability to handle speaker impedance fluctuations.

5. Symmetrical Twin-Monaural Construction
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.

Quad Push-Pull Amplification Design with Three-Stage Inverted Darlington Circuitry
Three-stage inverted Darlington circuitry brings greater efficiency to the A-9000R 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 A-9000R employs two extra transistors for each channel in a “quad push-pull” design that significantly enhances amplification power.

Four Amplifier Modes for the Ultimate in Versatility
Boasting the combined capabilities of a pre-amp and a power amp, the A-9000R is an amplifier with a difference. At the turn of a knob, it can be configured to run in any one of four distinct modes. Depending on how you want to integrate it into your hi-fi system, you can use it as an integrated amp, as a power amp, or as a pre-amp. On top of that, you can also set up the A-9000R in split mode. This enables the pre-amp and power amp to work separately, so you can incorporate another device, such as an equalizer.

Asynchronous Transfer via USB for 192 kHz/24-Bit HD Audio
On the rear panel of the A-9000R is a USB input that lets you connect a PC and play back stunningly lifelike 192 kHz/24-bit HD audio formats*. The USB implementation here utilizes asynchronous transfer to enhance the stability and quality of the audio signal.
*Playback of PC audio requires dedicated software that can be downloaded from an Onkyo website.

Separate Wolfson® 192 kHz/24-Bit DACs for L/R Channels
High-quality Wolfson DACs work to optimize analog audio performance on the A-9000R. The receiver features dual 24-bit WM8742 DACs, which support sampling rates of up to 192 kHz. Although these DACs are specified to handle two-channel audio on a single chip, Onkyo employs separate chips for each stereo channel to ensure the most accurate digital-to-analog conversion.

New Circuit Board Construction
Rather than being directly connected to the chassis base, the circuit boards inside the A-9000R 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.

Separate Panel Construction
The A-9000R features separate aluminum panels for the top, sides, and front to reduce unwanted vibrations caused by internal resonance. Compared to a one-piece chassis design, this construction method offers greater rigidity and improved noise reduction.

Audiophile-Quality Parts
To ensure optimal performance from the A-9000R, Onkyo’s engineers incorporated a range of professional-grade parts. Four 18,000-microfarad capacitors and an extremely low-impedance 1.2 mm thick copper bus plate both contribute to achieving a smooth and stable power supply. Machined and gold-plated RCA and phono terminals ensure an extremely clean connection, while Amphenol AES/EBU digital inputs provide excellent resistance to signal degradation and noise.

Dans sa toute nouvelle série de très haute fidélité, Onkyo ne s’est pas contenté de lancer lecteur réseau très tendance avec le T-4070. Cette sortie est accompagnée de deux nouveaux intégré stéréo à la conception audiophile remarquable : les A-9000R et A-9070. Ces deux superbes unités combinent haute technologie et haute qualité de fabrication pour un rendu sonore sur 2 canaux en tous points exceptionnels.

Onkyo A-9000R : amplificateur stéréo intégré 2x 140 watts avec DAC USB HD

L’A-9000R est igne héritier du couple préampli/ampli de puissance P-3000R et M-5000R . Cet ampli reprend en effet nombre des technologies développées pour ces deux produits phare. Les étages d’amplification de type AWRAT  (Advanced Wide Range Amplifier Technology) et Quad Push-Pull sont repris directement du P-3000R. La section préamplification s’appuie sur des modules DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry) ainsi qu’une interface numérique des plus aboutis. Les entrées AES/EBU et USB asynchrone viennent ainsi nourrir des convertisseurs N/A Wolfson 24 bits / 192 kHz.

Ce degré de sophistication s’accompagne d’une construction pensée pour limiter au maximum la transmission des vibrations aux circuits. L’utilisation de plaques d’aluminium distinctes pour les parois, latérale, supérieure et inférieure est une  des dernière trouvaille du constructeur japonais qui assure cette mission. Toujours dans cette optique, les circuits imprimés reposent sur des supports anti-vibratoires.

L’Onkyo A-9000R en bref :

• Amplificateur stéréo 2x 140 W (4 ?, 20 Hz–20 kHz, 0,05 %, 2 canaux en service, norme CEI)
• Technologie AWRAT (Advanced Wide Range Amplifier Technology)
• Circuits DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
• Quadruple amplification Push-Pull avec circuit Darlington inversé à trois niveaux
• Lecture audio HD 24 bits / 192 kHz via USB (Transfert asynchrone)
• Panneaux anti-vibrations en aluminium distincts pour les parois latérales, supérieure et inférieure
• Circuits imprimés avec supports anti-vibratoires internes
• Circuits à structure symétrique des canaux gauche/droite
• Convertisseurs N/A Wolfson 24 bits /192 kHz séparés (WM8742 x 2) pour les canaux gauche/droite
• Quatre condensateurs de grande capacité 18 000 µF
• Plaques de masse en cuivre de 1,2 mm d’épaisseur, pour une masse irréprochable
• Quatre modes d’amplification : amplificateur intégré, amplificateur de puissance, préamplificateur, Préamplificateur/Amplificateur de puissance séparés
• 4 entrées audio numériques : 1 AES/EBU à connecteur Amphenol, 1 optique et 2 coaxiales)
• 3 entrées et 1 sortie audio analogiques
• Sorties audio pre-out G/D
• Bornes d’entrée RCA et phono usinées plaquées or
• Borniers d’enceintes plaqués or personnalisés avec les fiches bananes
• Amplificateur de casque indépendant
• Préampli Phono discret (MM/MC)