Features
Controls
Connections
Features
Integrated Stereo Amplifier: The Onkyo A-9070 features a 2-channel amplifier
rated at 75 watts (into 8-ohms, at 20-20k, with 0.05%, driving 2 channels)
or 140 watts (into 4-ohms, at 20-20k, with 0.05%, driving 2 channels).
Push-Pull Design (with 3-Stage Inverted Darlington Circuitry):
The Onkyo A-9070 integrated amplifier employs an efficient push-pull
amplification design. This push-pull amplification design uses different
transistors on each channel to separately amplify the positive & negative halves
of the waveform. Meanwhile, 3-Stage Inverted Darlington Circuitry helps reduce
distortion at the output stage. Together with the push-pull amplifier design,
the 3-stage inverted Darlington Circuitry shapes a clean, consistent signal to
send to the outputs for ultra-low distortion & greater sound quality.
AWRAT (Advanced Wide Range Amp Technology): Onkyo's advanced
AWRAT design for power amplification comprises the following technologies to
ensure optimal audio performance..
- DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry): Since
the advent of digital audio, signal-to-noise ratios have improved dramatically.
However, the S/N ratio reflects static noise only, and takes no account of
another type of noise that occurs as the byproduct of sound reproduction;
dynamic noise. To reduce this type of noise, Onkyo has developed DIDRC
technology. 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 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 and
delivers clearer, truer audio.
- Low NFB (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.
- Closed Ground-Loop Circuits: AWRAT amplifiers employ 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.
- HICC (High Instantaneous-Current Capability): HICC
enables an AWRAT 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.
- Symmetrical Twin-Monaural Construction: Power devices
for the left and right channels of an AWRAT amplifier is 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.
New Circuit Board Construction w/ Internal Struts to Reduce
Vibration: 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
Dual Wolfson 24-bit/192kHz DACs: High-quality Wolfson DACs
work to optimize analog audio performance on the A-9070. The integrated amp
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.
PLL Ultra-Low Jitter Technology: Jitter is an unwanted
side-effect of the digital-to-analog conversion process caused by fluctuations
in the time domain of a digital signal. PLL ultra-low jitter technology reduces
jitter by comparing the input and output phases of the digital signal and
creating an accurate clock waveform. This enhances the precision of digital
signal processing and noticeably improves perceived audio quality.
Optimum Gain Volume Circuitry: Conventional
volume-attenuation methods involve initially dropping a signal close to the
amplifier's natural noise floor at low volumes. The signal can then become
tainted with noise, which subsequently gets amplified along with the signal.
Onkyo's Optimum Gain Volume Control Circuitry adjusts the gain so that less than
half the typical amount of attenuation is necessary. The signal never comes
close to the noise floor, and the result is noticeably clearer sound when
compared to conventional amplifier designs.
Phase Matching Bass Technology: From the warm low notes produced by a
cello to the deep frequencies of electronic music, a good audio system should be
able to deliver plenty of bass response. While many bass enhancement circuitries
effectively boost low-frequency sound, they are often prone to the effects of
phase shifting, which can overwhelm mid-range frequencies and muddy the sound.
Onkyo's Phase-Matching Bass Boost Technology effectively preserves mid-range
clarity-allowing vocals and strings to sound great; while maintaining a smooth,
powerful bass response at all volume levels.
High Output Transformer: At the heart of this integrated amplifier, you'll find a power supply that can maintain
or increase output power as required. Musically, this means that you'll have
deep, powerful bass; wide-ranging dynamics; musical peaks that sound composed;
and correct timbre and sound staging. The A-9070's high-output power
transformer, four 15,000 μF
capacitors, and low-impedance copper bus bars work in concert to enhance the
power and fidelity of your audio sources.
Anti-Resonant Chassis: To prevent vibration, a 1.6mm
anti-resonant chassis is used to isolate the audio signal from any interference
during the amplification process. This rugged chassis is superbly finished with
an aluminum front panel and volume control.
Independent Headphone Amplifier: The Onkyo A-9070 features a built-in,
independent headphone amplifier and a front-panel 1/4" headphone jack. You can
adjust the volume of the headphone amp independently from the integrated amp's
main volume. You can adjust the headphone level from -12dB to + 12dB.
Controls
Four Discrete Amplifier Modes: At the turn of a knob, the Onkyo
A-9070 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.
A/B Speaker Selector: You can choose to output sound from Speakers A,
Speakers B or both Speakers A &B.
Tone Control: You can independently adjust the Bass (100Hz) and Treble
(10kHz) of the Onkyo A-9070 from -14 to +14 dB; as well as adjust the balance of
the left and right speakers.
Direct Mode: By bypassing the tone control circuit, the Direct Mode
uses the shortest path for enhanced sound quality. Also, since the left/right
balance setting doesn't affect the sound quality, the balance can still be
adjusted even if the Direct Mode is enabled.
De-Emphasis Function: When a signal treated for treble emphasis
(pre-emphasis) is detected, the integrated amplifier is designed to restore the
original signal characteristics via the "de-emphasis" process. This function
only applies to the following digital audio sampling rates - 32kHz, 44.1kHz, &
48kHz (other sampling rates are not supported).
Auto Standby: When the Auto Standby function is activated, the
integrated amplifier will automatically enter Standby mode if there is no
operation and no audio signal input for 30 minutes.
Remote Control: The Onkyo A-9070 includes an IR remote control for
wireless operation of the integrated amplifier and RI-connected Onkyo
components.
RI (Remote Interactive) Control: Onkyo's RI system lets you operate
multiple RI-compatible Onkyo audio components through a single remote control.
On the rear-panel of the A-9070, you'll find two RI ports (3.5mm) to link
another Onkyo component (such as a CD player, iPod dock, or tuner), enabling
limited control of your setup using the integrated amp's remote.
- Auto Power On: When you start playback of an Onkyo component
connected via RI while the integrated amplifier is in Standby mode, the
integrated amp will automatically turn on and select that component as the
input source.
- Direct Change: When playback is started from an Onkyo component
connected via RI, the integrated amp automatically selects that component as
the input source.
- Remote Control: You can use the integrated amp's remote control
to operate your RI connected Onkyo components by pointing the remote at the
integrated amplifier's remote control sensor instead of the component.
- System Off: When you turn off the integrated amplifier, your RI
connected Onkyo components will turn off automatically.
Connections
3 Digital Audio Inputs: The A-9070 features a 24-bit/96kHz optical
(toslink) input and
dual 24-bit/192kHz coaxial (RCA) inputs that can carry digital audio signals from source devices (such
as a computer or laptop) for processing by the integrated amp's dual Wolfson 24-bit/192 kHz
DACs. The digital inputs do not support multichannel audio
signal; PCM signal only.
- Optical Input's Compatible Sampling Rates: 32kHz, 44.1kHz, 48kHz,
88.2kHz, & 96kHz
- Coaxial Input's Compatible Sampling Rates: 32kHz, 44.1kHz, 48kHz,
88.2kHz, 96kHz, 176.4kHz, & 192kHz
4 Analog Audio Inputs/1 Output: The Onkyo integrated amp offers
4
analog audio inputs; which include 3 gold-plated RCA inputs and 1 gold-plated Phono
input (MM/MC). There is also a stereo RCA line-output for
connecting a recording device.
Note: You can change the name of the currently selected analog or
digital input (not Phono input). Choose from CD, SACD, MD, Tape, Tuner, TV,
Game, PC, or Dock. You can also hide the display of inputs that are not
being used.
Main In Jacks: The stereo RCA Main Input jacks allow you to connect
an equalizer or preamplifier to the Onkyo A-9070.
Speaker A/B Terminals: The Onkyo A-9070 is equipped with A & B speaker
terminals to connect up to two pair of speakers. The receiver uses gold-plated
binding post connectors for the A & B speaker outputs. The binding posts are not
5-way because a plastic collar prevents their use with spade lugs; they will
accept bare wire (up to 10AWG), pin connectors, single banana plugs, and dual
banana plugs. You can output sound to only Speaker A, only Speaker B, or both A
& B Speaker. You can also choose to bi-wire a single of pair of speaker using
the integrated amp's A &B speaker terminals. This provides improved bass and
treble performance.
Note: If you are connecting only one pair of speakers, you can use
speakers with an impedance of 4- to 16-ohm. If you are connecting two pair
of speakers, you can use speakers with an impedance of 8- to 16-ohm.
Subwoofer Output: The Onkyo A-9070 features a gold-plated mono-RCA output to
connect a powered sub for added bass response.
Preamp Outputs: The A-9070's gold-plated stereo preamp outputs allow
you to connect the integrated amplifier to a power amp, so it can be used as a
preamplifier.
1/4" Headphone Jack: The A-9070 is fitted with a front-panel 1/4" headphone
jack to connect a set of headphones for private listening. While headphones are
connected, no sound is output from the integrated amplifier's speaker terminals
or preamp outputs.
RI Remote Control Jacks: The two 1/8" RI remote control jacks
allow you to connect this receiver to other compatible Onkyo components.
Detachable AC Power Cord: The A-9070 includes a detachable 6' AC
power cord.
