Technics SU-G700M2-K Stereo Integrated Amplifier (Black)

Stereo Integrated Amplifier SU-G700M2

Features

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-G700M2 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-G700M2 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 optimizing 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.

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 optimization 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.

Advanced Speed Silent Power Supply

The power supply technology incorporated in the
reference-class model SU-R1000 has been employed for improved speaker drive
power and a greater feel of energy. The switching frequency has been increased
from the conventional 100kHz band to the 400kHz band to ensure stable supply of
voltage and current and to reduce adverse effects of modulation noise on the
audio quality. The device is equipped with the same GaN FET and SiC SBD as
those mounted in the SU-R1000 to deliver maximum performance from the
high-speed switching power supply system.

What’s more, a Super Low Noise Regulator is provided in the later stage. It
prevents the decrease of regulation due to fixed switching frequency and
impedes the mixing of noise component into high frequencies. The result is a
low-noise and high-response power supply that maximizes the performance of the
digital amplifier.

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-G700M2 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. In
addition to the three-section construction, the SU-G700M2 comes with a bottom
chassis featuring a two-layer construction with 1.2-mm-thick and 2-mm-thick
steel plates, a top panel made of a 1.6-mm-thick steel plate and a 7-mm-thick aluminum
front panel for improved vibration damping.

Low-noise PHONO Input

PHONO MC input is now supported. 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.

Class AA Headphone Amplifier

The SU-G700M2 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.

High-Grade Parts

Technics’ exclusive block capacitor

The power supply unit for the amplifier features Technics’
exclusive block electrolytic capacitor optimized through scrupulous tuning,
which was installed in the SU-R1000.

Large ground terminal

The large ground terminal accommodates a thick,
large-diameter ground wire.

Brass speaker terminals

The screws used for securing the wires sending audio signals
to the speaker terminals are made of nonmagnetic brass.

Output Power

• 70W +
  70W ( 1kHz, T.H.D. 0.5 %, 8Ω, 20kHz LPF )

• 
  140W + 140W ( 1kHz, T.H.D. 0.5 %, 4Ω, 20kHz LPF )

FTC Output Power

• 70W +
  70W ( 1kHz, T.H.D. 0.5 %, 8Ω, 20kHz LPF )

• 
  140W + 140W ( 1kHz, T.H.D. 0.5 %, 4Ω, 20kHz LPF )

Load Impedance

• 4Ω-16Ω

Frequency Response

• PHONO
  (MM)

• 20Hz
  – 20kHz ( RIAA DEVIATION ±1dB, 8Ω )

• PHONO
  (MC)

• 20Hz
  – 20kHz ( RIAA DEVIATION ±1dB, 8Ω )

• LINE

• 5Hz
  – 80kHz ( -3dB, 8Ω )

• DIGITAL

• 5Hz
  – 80kHz ( -3dB, 8Ω )

Input Sensitivity / Input Impedance

• PHONO
  (MM)

• 2.5
  mV / 47 kΩ

• PHONO
  (MC)

• 300
  uV /100 Ω

• LINE

• 200
  mV / 22 kΩ

Analogue Input Terminal

• LINE x
  2 (LINE1, LINE2 / MAIN IN)

• 
  PHONO (MM/MC) x1

Digital Input Terminal

• Optical
  digital x2 (OPT 1, OPT 2)

• 
  Coaxial digital x2 (COAX 1, COAX 2)

• 
  USB-B x1 (PC)

Analogue Output Terminal

• LINE
  OUT x1　(LINE
  OUT)

• 
  PRE OUT x1 (PRE OUT)

Headphone Output

• Yes,
  Stereo Φ6.3 mm

PC(USB-B)

• USB
  2.0 high-speed

• 
  USB Audio Class 2.0, Asynchronous mode

Support Codec

• PCM
  Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz / 16, 24, 32 bit)

• 
  DSD Yes (2.8 MHz, 5.6 MHz, 11.2 MHz)

DSD contol mode

• ASIO
  Native mode, DoP mode

Power Supply

• AC
  120 V ,60 Hz

Power Consumption

• 95W

Dimensions (W x H x D)

• 16-15/16
  x 5-13/16 x 16-27/32 inch

Weight

• Approx.
  28 lbs

Accessories
AC Cord, Remote Control, Batteries for Remote
Control, Owner’s Manual