Stereo Integrated Amplifier
SU-G700

Technics' Definitive Integrated Amplifier Fully Conveys the Energy of the Music

Reference-class High-quality Audio Technology

Inheriting the reference-class audio technology concept, the JENO Engine transmits and processes audio signals in full digital and with minimal jitter from the input stage to the power stage. Speaker load adaptive phase calibration (LAPC) ensures ideal gain and phase characteristics for any type of speaker. The newly developed low-distortion switching power supply realises accurate power supply by suppressing switching frequency fluctuations caused by load shifting.

JENO Engine
(Jitter Elimination and Noise-shaping Optimization)

In order to faithfully transmit the massive amount of audio data sent to the speakers without loss, the SU-G700 power amp section uses full digital amplification employing the JENO Engine, based on the design concept of reference systems. In order to solve the issue of sound quality degradation due to jitter, which poses problems for conventional digital amplifiers, the SU-G700 has an original jitter reduction circuit that eliminates jitter over the entire audible frequency range. Also, a unique, high-precision PWM (Pulse Width Modulation) conversion circuit is used for PWM conversion, which is important for sound quality. By optimising items such as the noise-shaping speed, degree, and quantization number through our unique expertise, data even in the wide dynamic range contained in high-resolution sound sources is converted to PWM signals without loss. These technologies provide reproduction of natural and finely detailed sound, enabling perception even of delicate music nuances.

Concept of JENO Engine
Block Diagram of Digital Amplifier

LAPC (Load Adaptive Phase Calibration)

Speaker impedance changes with each frequency and a power amplifier is required to drive speakers without being affected by the speaker’s characteristics. However, conventional digital amplifiers are connected to speakers through a low-pass filter at the output stage, so they are even more strongly affected by the speaker impedance characteristics. Also, although the amplitude characteristics of conventional amplifiers due to negative feedback were improved, the phase characteristics could not be enhanced. We thus developed a speaker impedance adaptive optimisation algorithm that performs correction to the ideal impulse response through digital signal processing by measuring the frequency amplitude-phase characteristics of the amplifier with the speakers connected. This new technique enables flattening the frequency characteristics of amplitude and phase, which had previously not been achieved by amplifiers, as well as delivering a sound with rich spatial expression.

Concept of LAPC
Gain and Delay by Conventional Amplifier / LAPC

High-speed Silent Hybrid Power Supply

With a conventional switch mode power supply, the switching frequency changes in response to the load fluctuation in order to control the switching ON time for stabilising the output voltage. This fluctuation component in the switching frequency has a negative impact on sound quality. The newly developed power supply reduces the noise component harmful to sound quality by fixing the switching frequency. In addition, the latter stage in the switching power supply is provided with a linear regulator to stabilise the output voltage. The linear regulator uses custom, high-definition electrolytic capacitors.

What's more, our current resonance-type power supply decreases the level of switching noise. The parts used for absorbing noise, such as capacitors, were carefully selected. All possible measures were taken to achieve low noise and reproduce clear sound.

Concept of High-speed Silent Hybrid Power Supply

Digital Noise Isolation Architecture

For the PC input terminals, the amplifier uses power conditioners with non-magnetic carbon film resistors that provide strong protection against magnetic distortion, and high-quality ruby mica capacitors featuring excellent characteristics such as low dielectric loss, high voltage resistance, and temperature stability. Sound reproduction with greater purity was pursued by blocking the incursion of outside noise.

Concept of Digital Noise Isolation Architecture

Three-section Configuration

In integrated amplifiers there are a variety of circuits, including circuits that handle the micro-signals of inputs and those that handle a large current, such as output circuits and power-supply circuits. The SU-G700 uses a three-section construction with partitions installed between the circuit blocks according to the signal level handled. This eliminates interference between circuit blocks, thus achieving clear sound quality. Also, the chassis rigidity due to this construction suppresses the vibration of electrical parts, thereby suppressing deterioration in sound quality.

Graphic of Three-section Configuration

Optimally Activated Circuit System

The Optimally Activated Circuit System allows the operation of various digital modules to be stopped – such as those used for display, analogue and digital interfaces – to minimise the noise generated when music is playing.

Battery Driven Clock Generator

The best power supply for delicate circuitry such as the clock generator in new amplifiers is one entirely isolated from any noise or fluctuations in the mains supply. Technics has extensive experience in power supply isolation using batteries. This technology creates ultra-low-noise pre-amplifier stages.

Graphic of Battery Driven Clock Generator

High-quality Analogue Circuit

Analogue input is converted with high precision to a digital signal by the high quality 192-kHz/24-bit A/D converter [Burr-Brown PCM1804 (Texas Instruments)], so the high-purity sound reproduction capability of the full-digital system can be maximised in playing back analogue sources. High-definition switching relays are used for signal switching.

Low-noise PHONO Input

The PHONO input achieves low noise by using a differential parallel connection configuration of a first-stage, low-noise FET. In addition, four-level gain adjustment enables selection of the best gain according to the cartridge output. This enables optimal playback of high-grade analogue recorded sound sources tailored to the user's environment.

Graphic of Low-noise PHONO Input

Class AA Headphone Amplifier

The SU-G700 uses a Class AA headphone amplifier with separate amplifier circuits for voltage amplification and current amplification of the audio signal. The voltage is amplified by a high-grade operational amplifier, the current is amplified by an operational amplifier with high current-supply capability, and the high-grade PWM signal output from the JENO Engine is converted to analogue with high precision, thus enabling headphones to be ideally driven. This makes it possible to reproduce music with low distortion and a wide frequency range no matter what the load impedance of the headphones is.

Concept of Class AA Headphone Amplifier

AVoltage amplification is performed without any load current so the input signal is faithfully amplified.

BThe necessary current is supplied to the load according to the output voltage of the voltage amplifier.

High-rigidity Aluminium Cabinet

The High-rigidity Metal Double Chassis features a steel-plate inner chassis and a steel-plate outer chassis to reduce vibration and noise that degrade the purity of sound.

To support heavy parts and components and lower the centre of gravity for improved stability, the inner chassis is made of a 1.2-mm-thick plate. The bottom surface of the cabinet is a 2-mm-thick steel plate. This improves the vibration damping performance and achieves a low centre of gravity. The front panel is made of a 7-mm thick aluminium plate to resist the effects of electromagnetic noise.

Stereo Integrated Amplifier SU-G700

Show the enlarged photo of the front of SU-G700
Show the enlarged photo of the rear of SU-G700
Accurate Digital Technology
JENO Engine (Jitter Elimination and Noise-shaping Optimisation)
LAPC (Load Adaptive Phase Calibration)
High-speed Silent Hybrid Power Supply
Battery Driven Clock Generator
High-rigidity Metal Double Chassis
Noiseless Signal Technology
Digital Noise Isolation Architecture
Optimally Activated Circuit System
Technics Definitive Design
High-rigidity Cabinet
Three-section Configuration
FTC Output Power
70 W + 70 W (1 kHz, T.H.D. 0.5 %, 8 Ω, 20 kHz LPF)
140 W + 140 W (1 kHz, T.H.D. 0.5 %, 4 Ω, 20 kHz LPF)
Input Sensitivity / Input Impedance
LINE 200 mV / 22 kΩ, PHONO (MM) 2.5 mV / 47 kΩ
Frequency Response
LINE 5 Hz - 80 kHz (-3 dB, 8 Ω),
PHONO (MM) 20 Hz - 20 kHz (RIAA DEVIATION ±1 dB, 8 Ω),
DIGITAL 5 Hz - 90 kHz (-3 dB, 8 Ω)
Load Impedance
4 - 16 Ω
Analogue Input Terminal
LINE x 2 (LINE1 IN, LINE2 IN / MAIN IN) , PHONO (MM) x 1
Digital Input Terminal
Coaxial Digital x 2, Optical Digital x 2, USB-B (PC)
Analogue Output Terminal
PRE OUT x 1, LINE OUT x 1 (ANALOGUE SOURCE ONLY)
Headphone Output
Yes
USB-DAC (USB-B)
USB Audio Class 2.0, Asynchronous Mode
Support Codec
DSDYes (2.8224 MHz, 5.6448 MHz, 11.2896 MHz)
PCMYes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz / 16, 24, 32 bit)
Power Supply
AC120 V, 60 Hz
Power Consumption
85 W
Dimensions (W x H x D)
430 x 148 x 428 mm
(16 15/16 x 5 13/16 x 16 27/32 in.)

Weight
Approx. 12.3 kg
(Approx. 27.2 lbs)
Accessories
Remote Control, AC Cord, Owner's Manual

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