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.

Boasting the combined capabilities of a pre-amp and a power amp, the Onkyo A9070 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 Onkyo 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.

High-quality Wolfson DACs work to optimize analogue audio performance on the Onkyo A 9070 stereo amplifier. 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-analogue conversion.

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.
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.

•140 W/Ch at 4 Ohms, 20 Hz-20 kHz, 0.05%, 2 Channels Driven, IEC
•AWRAT (Advanced Wide Range Amplifier Technology)
•DIDRC (Dynamic Intermodulation Distortion Reduction Circuitry)
•Parallel Push-Pull Amplification Design with Three-Stage Inverted Darlington Circuitry
•192 kHz/24-Bit HD Audio Playback via Coaxial Inputs
•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 uF Capacitors
•1.2 mm-Thick Copper Bus Plate for Perfect Grounding
•Four Amplifier Modes (Integrated Amp, Power Amp, Pre-Amp, Split Pre-Amp/Power Amp)
•3 Digital Audio Inputs (1 Optical and 2 Coaxial)
•3 Analogue Audio Inputs and 1 Output
•Main-In Terminal
•Independent Headphone Amplifier
•Discrete Phono Equalizer (MM/MC)
•Speaker A/B Drive

•Power Output
140 Watts per Channel
•Dimensions (HxWxD) in mm
174.5x435x431
•Power Consumption
290 Watts
•Signal to noise ratio
107dB
•Input sensitivity & impedance
150 mV/47k Ohms
•Damping Factor at 8 ohm
130
•Total harmonic distortion
0.006%
•Dynamic Power
100W (8 Ohms)
•Freqency Response
20Hz - 20kHz
•Weight
18.1Kg


Model: A-9070