A-9070
INTEGRATED STEREO AMPLIFIER
AWRAT (Advanced Wide Range Amplifier
Technology)
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
distortion.
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 Three-
Stage 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
SPECIFICATIONS
Power Output
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)
Dynamic Power
450 W (1
Ω
), 310 W (2
Ω
), 230 W (3
Ω
),
180 W (4
Ω
), 100 W (8
Ω
)
THD+N (Total Harmonic Dist 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 k
Ω
(Line)
2.25 mV/47 k
Ω
(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)
Phono Overload
70 mV (MM, 1 kHz, 0.5%)
5.2 mV (MC, 1 kHz, 0.5%)
Frequency Response
10 Hz–100 kHz/+0 dB, -1 dB (1 W, Line)
1 Hz−250 kHz/+0 dB, -3 dB (1 W, 8
Ω
)
Tone Control
±10 dB, 80 Hz (Bass)
±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)
General
Power Supply
AC 230 V~, 50 Hz
Power Consumption
290 W
Standby Power Consumption
0.2 W
Dimensions (W x H x D)
435 x 174.5 x 431 mm
Weight
18.1 kg
CARTON
Dimensions (W x H x D)
627 x 320 x 534 mm
Weight
22.0 kg
Supplied Accessories
• Instruction manual • AC power cord • Remote controller
• AAA (R03) batteries x 2
Due to a policy of continuous product improvement, Onkyo reserves the right to change specifications and appearance without notice.
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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
Versatility
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 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.
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