Technics SU-GX70-K Network Audio Amplifier (Black)

Description

The definitive living room audio center that enables
seamless enjoyment of video, audio, and music through next-level integration
using Technics’ full digital technologies.

A heavily featured streaming amplifier that combines the
sonic genes of Technics Grand Class components with a wealth of source
functions, including video connectivity, the SU-GX70 Network Audio Amplifier
easily integrates into the home hi-fi system with the inclusion of an HDMI ARC
port. 

• Full
  Digital Amp, JENO Engine (Jitter Elimination and Noise-shaping
  Optimization)

• Twin
  Power Supply Circuit System

• Ideal
  Impulse Response through LAPC (Load Adaptive Phase Calibration)

• Pure
  Amplification Mode

• High-quality
  Audio through Low-impact HDMI Video Output

 

JITTER ELIMINATION AND NOISE-SHAPING OPTIMIZATION

Full Digital Amp, JENO Engine

The SU-GX70 uses a fully digital amplifier that incorporates
Technics’ renowned digital audio technology. Its digital transmission system
processes signals fully digitally in all stages from input to output. Compared
to analogue transmission, this system is less susceptible to signal degradation
caused by external noise, ensuring more precise signal transmission. Accurate
signal processing not only delivers high-resolution digital audio but also
maintains the soft texture inherent in analogue recordings.

Further, a JENO Engine has been used in the HDMI ARC (Audio
Return Channel), which has been installed in a Technics product for the first
time. This helps to reduce any degradation in sound quality caused by jitter
during the transmission of digital audio signals (S/PDIF), ensuring
unparalleled levels of clarity in TV audio. 

High-quality audio components have been used in various
other locations, too. For example, chip film capacitors have been used in place
of power supply noise-reduction capacitors and signal path coupling capacitors.

(LOAD ADAPTIVE PHASE CALIBRATION)

Ideal Impulse Response throughLAPC

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 technique
enables flattening of the frequency characteristics of amplitude and phase,
which had previously not been achieved by amplifiers, while also delivering a
sound with rich spatial expression.

Twin Power Supply Circuit System

The design of the power supply is extremely critical in
audio systems containing amplifiers, digital circuits and other such
components. To eliminate any adverse effects on the amplifier, the SU-GX70 is
equipped with a dedicated power supply for the power amplifier circuits that is
independent from all other circuits. As such, the same electrolytic capacitors
installed in high-end models have been used in the dedicated amplifier power
supply and the power amplifier components.

Further, by using the shortest possible connection between
the power supply and the power amplifier, the SU-GX70 ensures low noise and low
impedance. Elsewhere, the connections between the speakers and power amplifier
use non-magnetic brass screws.

The SU-GX70 uses a high-speed switching power supply of
approximately 130 kHz. By increasing the switching frequency, noise
interference on the music playback bandwidth is reduced. This enables highly
responsive power supply for music signals and powerful speaker drive
capability.

High-Quality Audio through Low-impact HDMI Video Output

For the SU-GX70 to receive audio signals through the HDMI
ARC (Audio Return Channel), due to the specifications, video signals must first
be output from the SU-GX70. However, the output of these signals can cause
unwanted noise.

As such, the video signals are output from the SU-GX70 at a
lower rate, and the digital value of the color of each pixel is set to zero.
This ensures low-load operation between the HDMI transmitting/receiving
devices, preventing any unwanted noise generation from the video signals.

This also reduces any impact on sound quality. Further,
transmitting the signals from the TV to the JENO Engine via the shortest
possible route minimizes any further impact from jitter. This is a mechanism
unique to Panasonic/Technics as HDMI licensors.

Pure Amplification Mode

In Pure Amplification Mode, shutting off the power supply to
the network and HDMI circuits removes any noise from the device or antenna.
This ensures music playback with even better clarity.

Analogue Input Using Discrete AmpCircuits

The discrete amp circuit used in the SU-GX70 was redesigned
and adapted from the circuit used in the SU-R1000, and the same symmetrical
layout has been used.

Further, other high-quality audio parts of the same grade as
those used in the SU-R1000 have also been adopted, such as low-noise FETs,
thin-film resistors, film capacitors, and electrolytic capacitors.

In this way, analog input has been fine-tuned to every
detail.

Space Tune™ for Optimal Adjustmentof Sound Quality

The SU-GX70 is equipped with the “Space Tune” function,
which enables the adjustment of sound space according to the room environment
and installation location so that anyone can enjoy superb music reproduction.

By using the “Technics Audio Centre*” app for
tablets/smartphones or by selecting a setting from the four presets—“Free,”
“Wall,” “Corner” and “In a Shelf”—using the main unit according to the
installation location, the user can achieve the most suitable sound quality for
a specific acoustic environment.

Furthermore, the “L/R Custom” feature lets the user enter
the setting independently for the left and right speakers when the speakers are
set up in different installation conditions. This brings out the best sound
reproduction in any installation conditions.

* Available for iOS devices only

Output Power
40W+40W(1kHz,T.H.D.1.0%,8Ω,20kHz LPF) /
80W+80W(1kHz,T.H.D.1.0%,4Ω,20kHz LPF)
FTC Output Power
30W + 30W ( 1kHz, T.H.D. 1.0%, 8Ω, 20kHz LPF ) / 60W + 60W (
1kHz, T.H.D. 1.0%, 4Ω, 20kHz LPF )
Load Impedance
4Ω-16Ω
Frequency Response
PHONO (MM): 20Hz – 20kHz ( RIAA DEVIATION ±1dB, 4Ω ) /
LINE:20Hz – 40kHz ( -3dB, 4Ω ) / DIGITAL: 20Hz – 80kHz ( -3dB, 4Ω )
Input Sensitivity / Input Impedance
PHONO (MM): 2.0 mV / 47 kΩ / LINE: 200 mV / 23 kΩ
Analogue Input Terminal
LINE x 2 / PHONO (MM) x1
Digital Input Terminal
Optical digital x2 / Coaxial digital x1 / USB-A x1 / USB-B
x1
Analogue Output Terminal
PRE OUT x1
Digital Output Terminal
HDMI ARC
Headphone Output
Yes, Stereo Φ6.3 mm (1/4″)
USB-A: iPod/iPhone/iPad
No
USB-A: Support Codec
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24, 32 bit)
USB-A: Support Codec FLAC
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24 bit)
USB-A: Support Codec DSD
Yes (2.8 MHz, 5.6 MHz, 11.2 MHz)
USB-A: Support Codec AIFF
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24, 32 bit)
USB-A: Support Codec ALAC
Yes(32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz / 16,
24 bit)
USB-A: Support Codec AAC
Yes (32, 44.1, 48, 88.2, 96 kHz/16-320kbps)
USB-A: Support Codec MP3
Yes (32, 44.1, 48 kHz / 16-320 kbps)
PC(USB-B)
USB 2.0 High-speed / USB Audio Class 2.0, Asynchronous mode
PC(USB-B) Support Codec LPCM
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192 352.8, 384 kHz / 16,
24, 32 bit)
PC(USB-B) DSD control mode
ASIO Native mode, DoP mode
MQA Decorder
Yes
LAN(DMR) WAV
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24, 32 bit)
LAN(DMR) FLAC
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24 bit)
LAN(DMR) DSD
Yes (2.8 MHz, 5.6 MHz, 11.2 MHz)
LAN(DMR) AIFF
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24, 32 bit)
LAN(DMR) ALAC
Yes (32, 44.1, 48, 88.2, 96, 176.4, 192, 352.8, 384 kHz /
16, 24 bit)
LAN(DMR) AAC
Yes (32, 44.1, 48, 88.2, 96 kHz/16-320kbps)
LAN(DMR) MP3
Yes (32, 44.1, 48 kHz / 16-320 kbps)
Ethernet Interface
LAN (100BASE-TX/10BASE-T)
Wi-Fi
LAN (100BASE-TX/10BASE-T)
Chromecast built-in
Yes
AirPlay 2
Yes
Bluetooth® (Support codec)
Yes (AAC, SBC)
Tuner
FM
Power Supply
AC 120 V ,60 Hz
Power Consumption
63W
Accessories
AC Cord, FM Indoor Antena, Remote Control, Batteries for
Remote Control, Owner’s Manual
Dimensions
(16-15/16 x 3-55/64 x 14-31/64)inch
Weight
Approx. 14.6 lbs