A-9070 INTEGRATED STEREO AMPLIFIER Power and Clarity in One Sophisticated Device

A-9070 INTEGRATED STEREO AMPLIFIER Power and Clarity in One Sophisticated Device
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Power and Clarity in One Sophisticated Device
Onkyo has declared war on distortion. The success of its campaign against noise is evident the moment you
switch on the A-9070 Integrated Stereo Amplifier. New DIDRC (Dynamic Intermodulation Distortion Reduction
Circuitry) dampens super high frequency distortion. Closed ground-loop circuits, HICC (High InstantaneousCurrent Capability), and vibration-damping construction combine to produce a startlingly pure sound across a
wide dynamic range.The unit’s four 15,000 µF capacitors keep plenty of power at the ready. Efficient parallel
push-pull amplification paired with three-stage inverted Darlington circuitry works at reducing distortion to
almost nil. Separate Wolfson ® 192 kHz/24-bit DACs for both left and right channels improve performance. The
unit is also equipped with 192 kHz/24-bit HD audio playback to handle modern formats. Four discrete amplifier
modes—integrated amp, power amp, pre-amp, and split pre-amp/power amp—offer flexibility when integrating
other hi-fi components. Details like an independent headphone amplifier, a phonograph equalizer, three digital
audio inputs, four analog inputs, and gold-plated audio terminals/speaker posts speak of the highest build quality.
The superb craftsmanship, technological refinement, and attention to detail invested in the A-9070 make it worthy
of serious consideration for those in the market for top-shelf hi-fi gear.
• 140 W/Ch at 4 Ω, 20 Hz–20 kHz, 0.05%, 2 Channels
Driven, IEC
• AWRAT (Advanced Wide Range Amplifier
• DIDRC (Dynamic Intermodulation Distortion
Reduction Circuitry)
• Parallel Push-Pull Amplification Design with ThreeStage Inverted Darlington Circuitry
• 192 kHz/24-Bit HD Audio Playback via Coaxial
• New Circuit Board Construction with Internal
Struts to Reduce Vibration
• Symmetrical Layout of L/R Channels
• Separate Wolfson® 192 kHz/24-Bit DACs (WM8742
x 2) for L/R Channels
• Four Large 15,000 µF Capacitors
• 1.2 mm-Thick Copper Bus Plate for Perfect
• Four Amplifier Modes (Integrated Amp, Power Amp,
Pre-Amp, Split Pre-Amp/Power Amp)
• 3 Digital Audio Inputs (1 Optical and 2 Coaxial)
• 3 Analog Audio Inputs and 1 Output
• Main-In Terminal
• Independent Headphone Amplifier
• Discrete Phono Equalizer (MM/MC)
• Speaker A/B Drive
• Audio L/R Pre-Out
• Customized, Gold-Plated, Banana Plug-Compatible
Speaker Posts
• Machined, Gold-Plated RCA and Phono Terminals
• Auto Standby Function
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AWRAT (Advanced Wide Range Amplifier
The A-9070 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-9070 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
4. HICC (High Instantaneous-Current Capability)
Handling current loads up to 100 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-9070 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.
Parallel Push-Pull Amplification Design with ThreeStage Inverted Darlington Circuitry
With parallel “push-pull” amplification, the amplifier’s
transistors alternately “push” and “pull” the current. In pairs,
one output device (a transistor) will amplify the positive
half of the waveform, while another output device amplifies
the negative. Push-pull amplification is highly efficient, but
can be affected by occasional instances of distortion. This is
where the three-stage inverted Darlington circuitry comes
in. Three-stage inverted Darlington circuitry actively works
to reduce distortion by employing a low negative-feedback
design to maintain voltage stability and enhance transient
response. It’s extremely sensitive to oscillations and requires
sophisticated control technology. Together with the
push-pull amplifier design, the three-stage inverted
Darlington Circuitry shapes a clean, consistent signal to
send to the outputs.
Four Amplifier Modes for the Ultimate in
Boasting the combined capabilities of a pre-amp and a
power amp, the A-9070 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-9070 in split mode. This
enables the pre-amp and power amp to work separately, so
you can incorporate another device, such as an equalizer.
Separate Wolfson® 192 kHz/24-Bit DACs for
L/R Channels
High-quality Wolfson DACs work to optimize analog audio
performance on the A-9070. 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-9070 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.
Audiophile-Quality Parts
To ensure optimal performance from the A-9070, Onkyo’s
engineers incorporated a range of professional-grade parts.
Four 15,000-microfarad capacitors and an extremely lowimpedance 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.
Due to a policy of continuous product improvement, Onkyo reserves the right to change specifications and appearance without notice.
140 W/Ch (4 Ω, 20 Hz–20 kHz, 0.05%,
2 channels driven, IEC)
75 W/Ch (8 Ω, 20 Hz–20 kHz, 0.05%,
2 channels driven, IEC)
450 W (1 Ω), 310 W (2 Ω), 230 W (3 Ω),
Dynamic Power
180 W (4 Ω), 100 W (8 Ω)
THD+N (Total Harmonic Distortion + Noise)
0.006% (Half power)
0.03% (1 kHz, 1 W Output)
0.008% (20 Hz–20 kHz, Half power)
0.03% (20 Hz–20 kHz, 1 W Output)
Damping Factor
130 (1 kHz, 8 Ω)
Input Sensitivity and Impedance
150 mV/47 kΩ (Line)
2.25 mV/47 kΩ (Phono MM)
0.18 mV/100 Ω (Phono MC)
Rated RCA Output Level and Impedance
1 V/300 Ω (Pre out)
Maximum RCA Output Level and Impedance
5 V/300 Ω (Pre out)
70 mV (MM, 1 kHz, 0.5%)
Phono Overload
5.2 mV (MC, 1 kHz, 0.5%)
10 Hz–100 kHz/+0 dB, -1 dB (1 W, Line)
Frequency Response
1 Hz−250 kHz/+0 dB, -3 dB (1 W, 8 Ω)
±10 dB, 80 Hz (Bass)
Tone Control
±10 dB, 10 kHz (Treble)
Signal-to-Noise Ratio
107 dB (Line, IHF-A)
60 dB (Phono MM, IHF-A)
70 dB (Phono MC, IHF-A)
Speaker Impedance
4 Ω–16 Ω (A or B), 8 Ω–16 Ω (A + B)
Power Output
AC 230 V~, 50 Hz
Power Supply
Power Consumption
290 W
Standby Power Consumption
0.2 W
Dimensions (W x H x D) 435 x 174.5 x 431 mm
18.1 kg
Dimensions (W x H x D) 627 x 320 x 534 mm
22.0 kg
Supplied Accessories
• Instruction manual • AC power cord • Remote controller
• AAA (R03) batteries x 2
NPR No. 11N97 08/11
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