Technics SU-GX70 Network Integrated Audio Amplifier

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

Specifications

• Full Digital amplifier, JENO engine (Jitter Elimination and Noise-shaping Optimization)
• 40W+40W(1kHz,T.H.D.1.0%,8Ω,20kHz LPF) / 80W+80W(1kHz,T.H.D.1.0%,4Ω,20kHz LPF)
• LAPC (Load Adaptive Phase Calibration)
• Space Tune
• Dual circuit power system
• Superior audio quality through low impact ARC HDMI video output
• LINE in x 2
• PHONO MM
• OPT x 2,
• COAX x 1
• USB-A, USB-B
• Internet service: Spotify, Deezer, TIDAL, Qobuz, internet radio, Amazon Music
• FM
• Chromecast, AirPlay2. Bluetooth
• Wi-Fi / ethernet LAN

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.

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.