Technics SU-GX70 Stereo 80-Watt Network Integrated Amplifier (Silver)

Full Digital Amplifier

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.

Abundant Input Options, Diverse Network Functions

This full digital amplifier features a wide variety of inputs including, Optical, digital coax, and HDMI ARC to seamlessly integrate into a home theater system with a TV. Analog sources include built-in FM radio, an MM Phono input, and two stereo RCA inputs with Pure Amplification Mode.

The SU-GX70 can play back high-resolution music wirelessly from the source stored in a smartphone, tablet or PC. It supports not only Bluetooth and AirPlay 2, but also Spotify Connect, Internet radio, and Chromecast built-in so that a wide range of music streaming services can be enjoyed. In addition to wireless streaming, you can connect to your network with the Ethernet LAN input, or connect a PC or flash drive directly via USB.

JENO Engine (Jitter Elimination and Noise-Shaping Optimization)

A JENO Engine has been used in the HDMI ARC (Audio Return Channel). This helps to reduce any degradation in sound quality caused by jitter during the transmission of digital audio signals, ensuring unparalleled levels of clarity in TV audio.

Ideal Impulse Response through LAPC

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.

Technics 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.

HDMI ARC (Audio Return Channel)

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.

Analog Input Using Discrete Amp Circuits

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 Adjustment of 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 iOS devices 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.

Additional Features

• 30W per channel FTC rated output power
• 7mm thick aluminum front panel
• Solid aluminum volume knob
• Stereo RCA pre out
• 1/4" headphone output 
• MQA decoder

Technics SU-GX70Specs

Channels	2.0
Power Output per Channel	2-Channel Driven: 40 W at 8 Ohms / 20 kHz / 1% THD (RMS) 80 W at 4 Ohms / 20 kHz / 1% THD (RMS)
Rear A/V Outputs	1x Stereo RCA Pre-Out
Speaker I/O	2x Binding Post Pair
Wi-Fi	Wi-Fi 6 (802.11ax); Dual-Band (2.4 & 5 GHz)
Bluetooth	5.1

Amplifier Type	Integrated Amplifier (Preamp/Power Amp Combo)
Channels	2.0
Power Output per Channel	2-Channel Driven: 40 W at 8 Ohms / 20 kHz / 1% THD (RMS) 80 W at 4 Ohms / 20 kHz / 1% THD (RMS)
Speaker Impedance	4 to 16 Ohms
Tone Control	Bass: ±10.0 dB Treble: ±10.0 dB

Auro 3D Support	No
Supported File Formats	2.8 MHz DSD, 5.6 MHz DSD, 11.2 MHz DSD, AAC, AIFF, ALAC, DSD, FLAC, MP3, MQA, PCM, WAV
Supported Sample Rates	Up to 384 kHz / 32-Bit (AIFF, LPCM, WAV) Up to 384 kHz / 24-Bit (ALAC, FLAC) Up to 96 kHz / 16-Bit (AAC) Up to 48 kHz / 16-Bit (MP3)

Rear A/V Inputs	2x Stereo RCA Line 1x Stereo RCA (Phono MM) with Ground Screw 1x Digital Coaxial 2x Optical TOSLINK 1x HDMI 1x USB-B
Rear A/V Outputs	1x Stereo RCA Pre-Out
Front I/O	1x 1/4" / 6.35 mm Headphone Output 1x USB-A Input
Speaker I/O	2x Binding Post Pair
HDCP Support	Yes
Audio Return Channel (ARC)	ARC
HDMI CEC	Yes
Media Card Slot	No
A/B Speaker Selection	No
Bi-Amp Capability	No
Input Impedance	Phono: 47 Kilohms Line: 23 Kilohms
Input Sensitivity	Phono (MM): 2 mV Line: 200 mV
Phono RIAA EQ Deviation	±1 dB (20 Hz to 20 kHz)

Wi-Fi	Wi-Fi 6 (802.11ax); Dual-Band (2.4 & 5 GHz)
Bluetooth	5.1
Bluetooth Profiles	A2DP, AVRCP
Supported Audio Codecs	AAC, SBC
Wireless Range	32.8' / 10 m (Bluetooth)
Wireless Audio Protocols	AirPlay 2, Chromecast built-in, Wi-Fi Direct

Virtual Assistant	Apple AirPlay, Works with Google Assistant
Mobile App Compatible	Yes: iOS Only App Name: Technics Audio Centre Functionality: Adjust Settings, Setup

Tuner Type	FM
Number of Tuner Presets	FM: 30 Stations
Radio Frequencies	FM: 87.9 to 107.9 MHz

Input Power	120 VAC, 60 Hz
Power Consumption	Active: 63 W

Dimensions (W x H x D)	16.9 x 3.9 x 14.5" / 430.0 x 98.0 x 368.0 mm
Weight	14.6 lb / 6.6 kg

Package Weight	18.12 lb
Box Dimensions (LxWxH)	20.1 x 17.8 x 7.1"