A-9070
INTEGRATED STEREO AMPLIFIER
A
WRAT (Advanced Wide Range Amplifier
T
echnology)
T
he 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
f
orms 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
i
mproving 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
f
orce 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
T
he 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)
H
andling 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
r
equired 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
a
ligned symmetrically. Each channel has the same electrical and
structural design, and signal pathways are uniform in length. This
h
elps to minimize errors in stereophonic playback.
Parallel Push-Pull Amplification Design with Three-
S
tage Inverted Darlington Circuitry
With parallel “push-pull” amplification, the amplifier’s
t
ransistors 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
t
he negative. Push-pull amplification is highly efficient, but
can be affected by occasional instances of distortion. This is
w
here 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
P
ower Output 140 W/Ch (4 ohms, 20 Hz–20 kHz, 0.05%,
2 channels driven, FTC)
75 W/Ch (8 ohms, 20 Hz–20 kHz, 0.05%,
2 channels driven, FTC)
D
ynamic Power 450 W (1 ohms), 310 W (2 ohms),
230 W (3 ohms), 180 W (4 ohms),
100 W (8 ohms)
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 ohms)
Input Sensitivity and Impedance
1
50 mV/47 k-ohms (Line)
2
.25 mV/47 k-ohms (Phono MM)
0.18 mV/100 ohms (Phono MC)
Rated RCA Output Level and Impedance
1
V/300 ohms (Pre out)
M
aximum RCA Output Level and Impedance
5 V/300 ohms (Pre out)
P
hono Overload 70 mV (MM, 1 kHz, 0.5%)
5.2 mV (MC, 1 kHz, 0.5%)
F
requency Response 10 Hz–100 kHz/+0 dB, -1 dB (1 W, Line)
1 Hz−250 kHz/+0 dB, -3 dB (1 W, 8 ohms)
Tone Control ±10 dB, 80 Hz (Bass)
±10 dB, 10 kHz (Treble)
S
ignal-to-Noise Ratio 107 dB (Line, IHF-A)
60 dB (Phono MM, IHF-A)
7
0 dB (Phono MC, IHF-A)
Speaker Impedance 4 ohms–16 ohms (A or B),
8 ohms–16 ohms (A + B)
General
Power Supply AC 120 V~, 60 Hz
P
ower Consumption 3.3 A
S
tandby Power Consumption
0.1 W
Dimensions (W x H x D)
17
1
/
8
˝ x 6
7
/
8
˝ x 16
15
/
16
˝
(
435 x 174.5 x 431 mm)
Weight 39.9 lbs. (18.1 kg)
CARTON
D
imensions (W x H x D)
2
4
11
/
1
6
˝
x 12
5
/
8
˝
x 21˝
(627 x 320 x 534 mm)
W
eight 48.5 lbs. (22.0 kg)
U
PC CODE
(B)
751398010392
S
upplied 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.
NPR No. 11N96 08/11
d
esign to maintain voltage stability and enhance transient
response. It’s extremely sensitive to oscillations and requires
sophisticated control technology. Together with the
p
ush-pull amplifier design, the three-stage inverted
Darlington Circuitry shapes a clean, consistent signal to
s
end to the outputs.
F
our Amplifier Modes for the Ultimate in
Versatility
B
oasting the combined capabilities of a pre-amp and a
power amp, the A-9070 is an amplifier with a difference. At
t
he 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
i
ntegrated 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
e
nables 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
2
4-bit WM8742 DACs, which support sampling rates of up
to 192 kHz. Although these DACs are specified to handle
t
wo-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
R
ather 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.
T
his 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-
i
mpedance 0.05˝ (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
e
nsure an extremely clean connection.
A-9070_US_A-9070 11/09/12 15:05 ページ 2
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