Audio Section

JENO Engine Digital Amp: The SU-GX70 uses a fully digital amplifier that incorporates Technics' renowned digital audio JENO Engine technology. Its digital transmission system processes signals fully digitally in all stages from input to output. Compared to analog 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 analog recordings.

• 8-Ohm Power Rating: 30 watts x 2 channels @ 1kHz with 1% THD
• 4-Ohm Power Rating: 60 watts x 2 channels @ 1kHz with 1% THD

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.
  

Load Adaptive Phase Calibration (LAPC): A power amplifier needs to drive speakers without being affected by the loudspeaker's characteristics, which can be difficult since speaker impedance changes with each frequency. Thus, Technics developed its own Load Adaptive Phase Calibration (LAPC), 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 most digital amplifiers, while also delivering a sound with rich spatial expression.

Discrete Amp Circuits: The discrete amp circuit used in the SU-GX70's analog input section has been designed specifically for the network audio amplifier and features a symmetrical layout with high-quality audio parts such as low-noise FETs, thin-film resistors, film capacitors, and electrolytic capacitors. As a result, your analog audio recordings sound natural with clarity and detail.

High Quality DAC: The Technics SU-GX70 network audio amplifier employs a high quality DAC (digital-to-analog converter) for its USB-B input, as well as its optical (toslink) and coaxial (RCA) digital inputs, plus its HDMI ARC jack. The internal DAC can support up to 32-bit/384kHz via USB, up to up to 24-bit/192kHz via Coaxial digital, and up to 24-bit/96kHz via Optical digital.

• MQA: The SU-GX70 includes MQA (Master Quality Authenticated) technology, which enables playback of MQA audio files and streams, delivering the sound of the original master recording. The built-in MQA decoder will restore the high-resolution signal heard in the studio and confirm it, using the authentication signature. "MQA" will be displayed on the front-panel LCD screen when MQA content is being played back.
• Other Supported Audio Formats: Other supported audio formats include LPCM, WAV, FLAC, DSD, AIFF, ALAC, AAC, and MP3.

Space Tune: The SU-GX70 is equipped with Technics' "Space Tune" function, which enables the adjustment of sound space according to the room environment and installation location, so that anyone in the room can enjoy excellent music reproduction. By using the Technics Audio Center app (for Apple iOS only) to measure your speakers' acoustic environment or by selecting one of four presets ("Free", "Wall", "Corner", or "In a Shelf") from the app according to your speakers' installation location, you can achieve the most suitable sound quality for a specific acoustic environment. Furthermore, the "L/R Custom" feature lets you enter the setting independently for the left and right speakers when the speakers are set up in different installation conditions. As a result, the SU-GX70 can bring out the best sound reproduction in practically any installation condition.

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 at the highest level of quality with even better clarity.

Tone Control: The SU-GX70 offers Bass & Treble control (-10 to +10), as well as Balance for the left and right speakers. Bass, Treble, and Balance affect the unit's speaker outputs, stereo preouts, and headphone output.

Speaker Outputs & Preouts: The Technics SU-GX70 network audio amplifier is equipped with speaker output terminals and a stereo RCA preout for different applications.

• Binding Post Terminals: The SU-GX70 is outfitted with sturdy, heavy-duty binding post speaker output terminals that will accept bare wire (up to 10AWG), pin-connectors, spade-lugs, or banana plugs (single only). You can connect a pair of 4 to 16 ohm loudspeakers.
• Stereo RCA Preout: The SU-GX70 also has a stereo RCA preout that allows you to connect an external power amplifier or powered subwoofer. The stereo RCA preout is full-range, so you'll need a powered sub with its own low-pass crossover filter.

Front-Panel Headphone Jack: The SU-GX70 features a front-panel 1/4" headphone jack so you can connect a set of headphones and listen privately to your favorite music. When a set of headphone are connected, the SU-GX70's speaker outputs and preouts are deactivated.

FM Tuner: The Technics SU-GX70 is equipped with a built-in FM tuner with auto, manual and preset tuning. You can store up to 30 FM station presets.

Detachable AC Power Cord: The Technics SU-GX70 comes with a detachable 5' AC power cord (IEC 3-prong) that plugs into the back of the network audio amplifier and into an AC power outlet or surge protector/line-conditioner (sold separately).

Analog & Digital Source Inputs

Line-Level Inputs: The Technics SU-GX70 features two sets of stereo analog line-level RCA inputs. The stereo analog line-level RCA inputs can be used to connect a CD player or tape deck.

Phono MM Input: In addition, to the stereo line-level analog audio inputs, the SU-GX70 features a Phono MM input with ground terminal for connection of a turntable using a phono MM cartridge.

Optical & Coaxial Digital Inputs: The Technics SU-GX70 is outfitted with two optical (toslink) and one coaxial (RCA) digital audio input to connect a CD or SACD player. These digital inputs support 16-bit or 24-bit 2ch PCM audio files. The optical digital inputs will support up to 96kHz sampling frequencies, while the coaxial digital input will accept up to 192kHz sampling frequencies.

HDMI ARC: The Technics SU-GX70 receives audio signal from your TV, projector, or other display through its HDMI ARC (Audio Return Channel) jack. HDMI CEC (Consumer Electronic Control) is also supported through the unit's HDMI ARC jack, allowing your TV and the SU-GX70 to power on/off at the same time and the SU-GX70 automatically switching to the HDMI ARC input when using your TV's remote. The HDMI ARC jack supports up to 24-bit/192khz stereo 2ch PCM audio.

• The HDMI ARC jack does not support Dolby Digital, DTS, or other multichannel audio formats.
• The unit's HDMI ARC jack only supports audio transmission. It does not transmit video signals.

USB-B Input with Technics Audio Player App: The SU-GX70 is equipped with a USB-B 2.0 input for connection to your Windows PC or Mac computer. You'll be able to playback LPCM and DSD music files stored on your laptop or desktop computer through the Technics integrated amplifier. You'll need to download the Technics Audio Player onto your Windows PC or Mac computer. The Technics Audio Player is a music player application for Windows and Mac with high-resolution audio data processing capabilities. It also provides control functions such as Playlist (Create/Edit/Save), Play/Pause/Stop, Previous/Next Track, Shuffle/Random, and Repeat (Playlist/Tack).

• LPCM: up to 32-bit and 384kHz
• DSD: 2.8/5.6/11.2 MHz

Front-Panel USB-A Port: The Technics SU-GX70 is also equipped with a front-panel USB-A port for playback of a variety of compressed and Hi-Res music files stored on a USB MSC (mass storage class) device. A USB thumbdrive (512MB) or USB HDD (up to 2TB) can be connected to the front or rear USB port. A USB HDD (hard disk drive) may require an external AC power adapter. Compatible USB devices must be formated in FAT16, FAT32, or NTFS. It can recognize up to 800 music folders and 8000 music files. You can even create a customized playlist containing up to 1,000 music tracks on a single USB MSC device. You'll be able to control playback functions (such as Play/Pause, Stop, Fast Forward/Rewind, Previous/Next Track, and Random/Repeat) from the SU-GX70's front-panel, as well as view song/artist/album text (no album art) from the front-panel display. The front USB-A port (5V/0.5A) can also be used to charge USB-enabled electronic devices, such as a smartphone. Compatible music files include -

• WAV: up to 32-bit and 384kHz
• FLAC: up to 24-bit and 384kHz
• DSD: up to 1-bit and 11.2MHz
• AIFF: up to 32-bit and 384kHz
• ALAC: up to 24-bit and 384kHz
• AAC: up to 320 kbps and 96kHz
• MP3: up to 320 kbps and 48kHz

Network & Bluetooth Audio

Wired or Wireless Network Connection: The Technics SU-GX70 offers a wired (Ethernet) and wireless (WiFi) network connection. The SU-GX70 is outfitted with a Ethernet (RJ45) jack for a hardwired connection to your network router. It also features dual-band 2.4/5GHz WiFi (802.11ax) for a wireless connection to your WiFi network router. A wired or wireless network provides access to online music services from Technics Audio Center App, Google Cast, and Apple AirPlay 2; as well as local digital music libraries stored on DLNA-compliant network devices.

Technics Audio Center App: The Technics Audio Center app (for (Apple iOS & Android OS) lets you access select online music services and internet radio, as well as and create a wireless multi-room audio system through multiple Technics Audio Center (TAC) app compatible devices. The Technics Audio Center app also provides access to the music stored on a connected DLNA-compatible server, content stored on the smartphone or tablet device running the app, and music files on a connected USB MSC devices, giving you integrated playback control.

• Online Music Services: The Technics Audio Center (TAC) app allows access and control of select Internet Radio and online music services such as Amazon Music (including HD), Tidal, Deezer, Qobuz, and TuneIn. You can create and choose from a number of favorite music playlists, radio stations and podcasts from TuneIn, Spotify, Amazon Music, Tidal, Qobuz, & Deezer.
• Multiroom Audio: If you have multiple compatible Technics Audio Center (TAC) app devices, you can create a wireless multiroom audio system that allows you to enjoy compatible online music service (listed above) and internet radio; as well the built-in FM tuner, Bluetooth & USB audio, plus analog (including line-level/phono) & digital (optical/coax/HDMI ARC) source inputs on the SU-GX70 and other TAC app compatible devices (up to 6 total devices) in different rooms throughout your home. *AirPlay 2 and Google Cast are not supported since they are their own proprietary multiroom eco-system.

Google Cast: Use the Google Home App (for Apple iOS and Android OS) to enable Google Cast. Google Cast gives you access to hundreds of online music streaming services, internet radio, and podcasts. Google Cast streams audio directly from the cloud, so you get the 24-bit/96kHz sound quality and the ability to enjoy crystal clear sound exactly the way the artist intended. Simply tap the Cast button from a Google Cast compatible music app on your Apple iOS or Android OS device to start streaming to the SU-GX70. You can search, browse, play, skip, and turn up the volume directly from the music apps you know and love on your compatible smartphone or tablet. Google Cast supports FLAC, WAV, AAC, and MP3 music files. While you cast your music, you can still use your smartphone to answer a call, play a game, send a text, and even leave the room - all without interrupting what's playing on the Technics SU-GX70.

• Music, Radio, & Podcasts: Google Cast lets you play music from popular music services and search by artist, song, genre, album playlist, mood, or activity. You can also listen to your favorite internet radio stations and podcasts. Compatible music and internet radio apps include Tidal, Spotify, Pandora, TuneIn, iHeart Radio, YouTube Music, and more (subscriptions and fees will apply). Click here for a complete list of Google Cast compatible apps. You'll also be able to stream your favorite music, playlists, podcasts, and more that are stored on your Android (OS 6.0+) device to the SU-GX70. You cannot stream stored content on an Apple iOS device using Google Cast. If you're on your laptop or computer, you can also cast any music streaming website through the Chrome web browser to the network player.
• Multiroom Audio: Add more Google Cast speakers throughout your home (sold separately) to create a whole house audio experience. You can play the same Google Cast compatible music app (like Tidal, Spotify, or Pandora) on all speakers or groups of speakers in different rooms of your home. You'll be able control the multiroom audio system from the Google Home app on your Apple iOS or Android device, or using the Google Assistant and your voice on a compatible Google Home device.
• Voice Control (Optional): Purchase a Google Home wireless speaker (sold separately) and gain voice control of compatible Google Cast music apps. You'll be able to access a specific music app and then select a specific station or song using only your voice. You'll also have voice control over Play, Pause, Skip, & Volume. The Technics SU-GX70 and your Google Home speaker must be connected to the same wireless (WiFi) network.

AirPlay 2: AirPlay 2 is an advanced and easy-to-use wireless multiroom audio platform for iTunes, Apple Music, and other compatible Apple iOS apps. With AirPlay 2 you can play any sound from your Apple iOS device (running iOS 11.4 or later) or Mac computer (running OS X 10.13.2) through the SU-GX70 and other compatible AirPlay 2 products throughout your home. You can choose to play audio in one room, play the same audio in grouped rooms, or play the same audio in every room. If you are an Apple Music subscriber, you can even play different music in different rooms (you can control and group directly from Apple's Music App and Home app on your Apple iOS device). You will also be able to ask Siri-enabled devices (like your Apple iPhone, iPad, or Watch) to control playback of your Apple Music on the SU-GX70 player. You can even watch videos and movies from YouTube and Netflix on your compatible Apple iOS device or Mac computer with perfectly synced audio on the Technics SU-GX70 network audio amplifier.

Internet Radio & Podcasts through TuneIn: TuneIn includes access to thousands of free internet radio streams and podcasts from all corners of the globe. You can browse among the thousands stations and podcasts neatly organized into popular categories and select a station or podcast that appeals to your mood. You can even add a station or podcast to your favorite list and call up the station or podcast easily.

Spotify Connect: The integration of Spotify Connect will enable Spotify Premium users to instantly select and wirelessly stream music to the SU-GX70 from within the Spotify app (Apple iOS or Android). Spotify is a digital music service that gives you on-demand access to one of the largest music libraries in the world. Spotify makes it easier than ever to discover, manage, and share music with your friends. You can browse music by artist, album, track, or most popular; and create your own music library with customized playlists.

DLNA Compliant: The Technics SU-GX70 is DLNA compliant for playback of various music files stored on your Windows PC (11 or 12) or DLNA-certified NAS drives connected to your home network. MAC OSX computers and laptops require third party software to be visible on the network (Twonky, Plex, Servio etc.) as they do not support DLNA. You'll be able to control playback functions (such as Play/Pause, Stop, Fast Forward/Rewind, Previous/Next Track, and Random/Repeat) from the SU-GX70's front-panel, as well as view song/artist/album text (no abloom art) from the front-panel display.

• WAV: up to 32-bit and 384kHz
• FLAC: up to 24-bit and 384kHz
• DSD: up to 1-bit and 11.2MHz
• AIFF: up to 32-bit and 384kHz
• ALAC: up to 24-bit and 384kHz
• AAC: up to 320 kbps and 96kHz
• MP3: up to 320 kbps and 48kHz

Bluetooth Audio Streaming: Built-in Bluetooth 5.1 with support for wireless audio streaming (A2DP) and control (AVRCP) allows you to wirelessly stream audio from stored music, music apps, and other audio content from Bluetooth-enabled source devices (such as a smartphone, tablet, laptop, or computer) to the Technics SU-GX70 network audio amplifier. The unit supports SBC and AAC Bluetooth codecs. You'll also be able to control basic playback functions (such as Play/Pause, Stop, and Skip) from the included remote or front-panel. You can pair multiple devices (up to 8) to the SU-GX70, but only one can be connected and used for playback at a time. The unit will automatically connect to the last paired Bluetooth device when switching the input source to Bluetooth when the Bluetooth source is in wireless range (up to 33').

Control & Convenience Features

Front-Panel Control with Display: The front-panel is made from 7mm thick aluminum and features a solid aluminum volume knob to create a high-quality feel and ensure reliable operation. There is also an input selector knob and power on/off button. In addition, there is a touchscreen display on the front-panel that offers touch sensitive playback controls such as Play/Pause, Stop, Fast Forward/Rewind, and Previous/Next Track. You can turn on/off the touch sensitive button beep confirmation. The display will indicate source input selection, playback status, as well as song/artist/album text (no album art) and other menu settings.

IR Remote: The included IR remote provides wireless operation of the SU-GX70 network audio amplifier.. However, you'll also need a compatible Apple iOS or Android OS device with supported applications for complete control of the unit.

Favorites: You can register up to 9 of your favorite stations, music files, and playlists from the unit's built-in FM tuner, USB-A port, Internet Radio (TuneIn), Spotify Connect, Deezer, Amazon Music, Qobuz and Tidal for easier access.

Sleep Timer: The Sleep Timer can turn the network audio amplifier off after a set period of time (30, 60, 90, or 120 minutes.

Auto Off: If the SU-GX70 network audio amplifier is left unused with no audio signal or operation for about 20 minutes, the unit will enter Standby mode to conserve its power consumption and save energy.

Firmware Updates: Firmware update can be applied over a wired or wireless network connection, or even via USB. You can check here for the latest and newest firmware updates.