Integrated Stereo Amplifier: The Onkyo A-9050 features a 2-channel amplifier
rated at 75 watts (into 8-ohms, at 1k, with 0.08%, driving 2 channels)
or 65 watts (into 4-ohms, at 1k, with 0.08%, driving 2 channels).
WRAT (Wide Range Amp Technology): WRAT is based around a low
negative-feedback circuit topology that works to reduce signal noise and
distortion across the frequency range. A "closed ground-loop circuit" design is
employed, 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. High Instantaneous Current Capability (HICC) enables WRAT amplifiers
to immediately cancel the speakers' reflex energy and instantaneously send out
the next signal. The same high current better manages speaker impedance
fluctuations, which can negatively affect performance.
3-Stage Inverted Darlington Circuitry: Many amplifiers employ a
negative feedback (NFB) design that counters distortion by feeding back the
opposite phase of the output signal into the input stage. Unfortunately, NFB is
easily affected by inverse electromotive forces from the speakers, leading to an
increase in circuit noise. Three-Stage Inverted Darlington Circuitry is a core
Onkyo technology incorporating a low-NFB design that makes the sound more
natural. Sensitive to oscillations, this circuitry requires very advanced
control technology in order to be incorporated into the amplifier.
Wolfson 24-bit/192kHz DAC: This integrate amplifier is equipped with a 24-bit/192kHz Wolfson DAC (WM8718) to decode and playback high-resolution recordings with
less jitter and clearer sound.
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.
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-9050's high-output power transformer, twin 10,000 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.
Remote Control: The Onkyo A-9050 includes an IR remote control for
wireless operation of the integrated amplifier and RI-connected Onkyo
A/B Speaker Selector: You can choose to output sound from Speakers A,
Speakers B or both Speakers A &B.
Impedance Switch: You can set the impedance of the speakers that you
connect to the Onkyo A-9050. You can choose 4Ω (4-7
ohm speakers) or 8Ω (8-16 ohm speakers).
Tone Control: You can independently adjust the Bass (100Hz) and Treble
(10kHz) of the Onkyo A-9050 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.
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.
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-9050, you'll find a single RI port (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
- 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.
3 Digital Audio Inputs: The A-9050 features 24-bit/96kHz optical
(1 toslink) and
coaxial (2 RCA) inputs which can carry digital audio signals from source devices (such
as computers or laptops) for processing by the onboard Wolfson 24-bit/192 kHz
DAC. The integrated amp's digital inputs do not support multichannel audio
signal; PCM signal only.
6 Analog Audio Inputs/1 Output: The Onkyo integrated amp offers 6
analog audio inputs; which include 4 gold-plated RCA inputs, 1 gold-plated Phono
input (MM), and 1 front-panel 3.5mm input. There is also a stereo RCA line-output for
connecting a recording device.
Speaker A/B Terminals: The Onkyo A-9050 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
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-9050 features a gold-plated mono-RCA output to
connect a powered sub for added bass response.
Preamp Outputs: The A-9050's gold-plated stereo preamp outputs allow
you to connect the integrated amplifier to a power amp, so it can be used as a
1/4" Headphone Jack: The A-9050 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 Jack: The 1/8" RI remote control jack
allows you to connect this receiver to other compatible Onkyo components.
Detachable AC Power Cord: The A-9050 includes a detachable 6' AC