Technics Network Audio Streaming Amplifier SU-GX70

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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.

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.

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.

With latest update now supports Qobuz Connect streaming:

Qobuz has a catalogue of over 100 million tracks across all genres, from both major and independent labels, and offers the world’s largest selection of albums in Hi-Res quality. All tracks are available for streaming in the following audio qualities:

• High resolution quality (Hi-Res): often referred to as studio quality, this is the sound as created and recorded by the artist in the studio. Hi-Res provides unparalleled listening quality (24-Bit FLAC audio/up to 192 kHz).
• CD quality: often referred to as HiFi or HD, it provides uncompressed audio quality (16-Bit/44.1 kHz encoded sound).

Premium Design

We have ensured high-quality design throughout, including the 7mm thick aluminum front panel with a hairline finish and the engraved Technics logo.

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

Qubuz Connect

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