Technics SU-GX70 Grand Class Network Audio Amplifier

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Technics SU-GX70 Grand Class Network Audio Amplifier at Vinyl Sound Buffalo, NY USA The SU-GX70 is a Grand Class network audio amplifier from Technics (Osaka, Japan), available at Vinyl Sound in Buffalo, New York, USA. Announced in April 2023, the SU-GX70 is the first Technics product to incorporate an HDMI ARC port, enabling direct, high-quality audio integration with a television while preserving Technics' full-digital amplification architecture. It delivers 40W + 40W into 8 ohms and 60W + 60W into 4 ohms (FTC) via the JENO Engine (Jitter Elimination and Noise-shaping Optimisation) and benefits from LAPC (Load Adaptive Phase Calibration), a Twin Power Supply Circuit System, and a Pure Amplification Mode. Streaming capabilities include Chromecast built-in, AirPlay 2, FM radio, TIDAL, Qobuz, Spotify Connect, Amazon Music, Deezer, and Internet Radio. An MM phono input, two optical digital inputs, one coaxial, USB-A and USB-B, and the HDMI ARC output are all provided. The SU-GX70 is available at Vinyl Sound in Buffalo, NY. JENO Engine Full-Digital Amplification and HDMI ARC Integration The SU-GX70 uses a fully digital amplifier transmitting signals digitally in all stages from input to output, using Technics' JENO Engine to eliminate jitter and shape quantisation noise for precise signal transmission. Compared to analogue signal paths, this digital transmission approach is less susceptible to external noise-induced degradation and faithfully maintains the character of both high-resolution digital sources and analogue recordings. A key innovation is the HDMI ARC (Audio Return Channel) integration: when receiving audio from a television, the JENO Engine processes the incoming S/PDIF signal to eliminate jitter in transmission, the first time Technics has applied JENO Engine technology to an HDMI ARC connection. To prevent HDMI video output from generating interference, video signals are output at a lower rate with pixel colour values set to zero, ensuring low-load HDMI operation between connected devices with minimal sonic impact. LAPC (Load Adaptive Phase Calibration) measures the connected speaker's frequency amplitude-phase characteristics and applies speaker-specific digital correction for flat amplitude and phase response, achieving the ideal impulse response that conventional amplifiers cannot attain. Twin Power Supply, Space Tune, and Pure Amplification Mode The SU-GX70's Twin Power Supply Circuit System provides the power amplifier circuits with a dedicated power supply fully independent of all other circuits, including the network and HDMI sections, using the same grade of electrolytic capacitors as those found in high-end Technics designs. The wiring between this dedicated supply and the power amplifier is optimised for the shortest possible path length to ensure low noise and low impedance. A high-speed switching power supply operating at approximately 130 kHz shifts switching noise above the audio band. Pure Amplification Mode shuts off power to the network circuits and the HDMI circuits, removing antenna-and-device-sourced noise and providing the cleanest possible music playback signal path. Space Tune allows the user to select from four acoustic environment presets (Free, Wall, Corner, In a Shelf) or to use the Technics Audio Centre app for precise per-channel spatial adjustment, optimising the sound reproduction for the room and speaker placement. Key Features HDMI ARC with JENO Engine Processing: First Technics product with HDMI ARC; JENO Engine eliminates jitter in the incoming TV audio S/PDIF signal; low-impact HDMI video output prevents noise generation from video signals. JENO Engine Full-Digital Amplification: Fully digital signal processing from input to output; jitter elimination and noise-shaping optimisation for precise, low-distortion music reproduction. LAPC (Load Adaptive Phase Calibration): Measures connected speaker's amplitude-phase characteristics; applies speaker-specific digital correction for ideal impulse response and spatial expression. Twin Power Supply Circuit System: Dedicated amplifier power supply independent of all other circuits; 130 kHz switching frequency; shortest-path wiring for low noise and low impedance. Pure Amplification Mode: Shuts off network and HDMI circuits for the lowest possible noise floor during music playback. Space Tune: Four room acoustic presets plus L/R Custom independent setting via Technics Audio Centre app. Comprehensive Streaming: Chromecast built-in, AirPlay 2, TIDAL, Qobuz, Spotify Connect, Amazon Music, Deezer, Internet Radio, FM radio; LAN and Wi-Fi (IEEE 802.11 a/b/g/n/ac). MM Phono Input: Moving magnet phono input (2.0 mV / 47 kohms) for turntable connection. MQA Decoding: Full MQA decoding supported for MQA files via USB-A, USB-B, or network playback. USB-B DAC: PCM up to 384 kHz / 32-bit; DSD up to 11.2 MHz (ASIO Native or DoP mode) via USB Audio Class 2.0 asynchronous. Technical Specifications Output Power 40W + 40W (1 kHz, T.H.D. 1.0%, 8 ohms, 20 kHz LPF); 80W + 80W (1 kHz, T.H.D. 1.0%, 4 ohms) FTC Output Power 40W + 40W (1 kHz, T.H.D. 1.0%, 8 ohms); 60W + 60W (1 kHz, T.H.D. 1.0%, 4 ohms) Load Impedance 4 to 16 ohms Frequency Response (PHONO MM) 20 Hz to 20 kHz (RIAA deviation ±1 dB, 4 ohms) Frequency Response (LINE) 20 Hz to 40 kHz (-3 dB, 4 ohms) Frequency Response (DIGITAL) 20 Hz to 80 kHz (-3 dB, 4 ohms) Input Sensitivity / Impedance (PHONO MM) 2.0 mV / 47 kohms Input Sensitivity / Impedance (LINE) 200 mV / 23 kohms Analogue Inputs LINE x2, PHONO MM x1 Digital Inputs Optical x2, Coaxial x1, USB-A x1, USB-B x1 Analogue Output PRE OUT x1 Digital Output (HDMI) HDMI ARC x1 Headphone Output 6.3 mm stereo jack USB-B Support (PCM) 32 / 44.1 / 48 / 88.2 / 96 / 176.4 / 192 / 352.8 / 384 kHz, 16 / 24 / 32-bit USB-B Support (DSD) 2.8 / 5.6 / 11.2 MHz (ASIO Native or DoP mode) Streaming Services Chromecast built-in, AirPlay 2, Spotify Connect, TIDAL, Qobuz, Amazon Music, Deezer, Internet Radio, FM Network LAN 100BASE-TX / 10BASE-T; Wi-Fi IEEE 802.11 a/b/g/n/ac Bluetooth AAC, SBC Power Supply AC 120V, 60 Hz Power Consumption 63W Dimensions (W x H x D) 430 x 98 x 368 mm (approx., per imperial: 16-15/16 x 3-55/64 x 14-31/64 in.) Weight Approx. 6.6 kg (14.6 lbs) What's in the Box Technics SU-GX70 Grand Class Network Audio Amplifier Remote Control Batteries for Remote Control FM Indoor Antenna AC Power Cord Owner's Manual Frequently Asked Questions What is the Technics SU-GX70? The Technics SU-GX70 is a Grand Class network audio amplifier from Technics of Osaka, Japan, delivering 40W + 40W into 8 ohms (FTC) via the JENO Engine full-digital amplification platform, with LAPC speaker calibration, a Twin Power Supply Circuit System, and the brand's first HDMI ARC port with JENO Engine jitter elimination on the incoming TV audio signal. It supports Chromecast, AirPlay 2, TIDAL, Qobuz, Spotify, Amazon Music, Deezer, and Internet Radio, plus FM radio, MM phono input, and a USB-B DAC supporting DSD up to 11.2 MHz and PCM to 384 kHz / 32-bit. Pure Amplification Mode and Space Tune room acoustic correction are included. How does the Technics SU-GX70 compare to the NAD C 3050 with MDC2 BluOS-D? The Technics SU-GX70 and the NAD C 3050 with MDC2 BluOS-D module are both streaming integrated amplifiers in a broadly similar price range, but they take different approaches. The NAD C 3050 with MDC2 BluOS-D delivers 100W per channel into 8 ohms via NAD's Hybrid Digital amplifier topology and uses the BluOS multiroom streaming ecosystem for wide streaming service compatibility including Roon Ready certification. The Technics SU-GX70 delivers 40W + 40W FTC into 8 ohms via full-digital JENO Engine amplification and adds HDMI ARC integration with JENO Engine jitter processing, which the NAD does not offer. The SU-GX70 also includes LAPC speaker calibration and Space Tune room correction. The NAD C 3050 provides more raw power; the SU-GX70 offers unique TV audio integration and Technics' digital amplification precision. Can I connect the SU-GX70 to my television? Yes. The SU-GX70 includes an HDMI ARC (Audio Return Channel) port that receives audio from a compatible television, passing it through the JENO Engine for jitter elimination before amplification. This allows the SU-GX70 to serve as the sound system for a TV as well as a dedicated hi-fi amplifier. The HDMI video output from the SU-GX70 is intentionally low-load to prevent video signal processing from generating audio noise. What is Pure Amplification Mode? Pure Amplification Mode shuts off power to the SU-GX70's network streaming and HDMI circuits, eliminating all antenna and device-sourced noise from these sections during music playback. In this mode, the amplifier operates only its core amplification circuitry, providing the quietest and cleanest signal path for critical listening from analogue or digital sources connected via non-network inputs. Where can I buy the Technics SU-GX70 in Buffalo, NY or the USA? The Technics SU-GX70 Grand Class Network Audio Amplifier is available at Vinyl Sound in Buffalo, New York, an authorised Technics dealer serving customers across the USA. Contact Vinyl Sound Buffalo for availability, demonstration, and system advice. Show more