One of the coolest trends in the home audio landscape is a growing number of high-end network-ready amplifiers, able to serve up just about any content you could want using virtually any method—just add speakers.
The Technics SU-GX70 is one of the latest additions to this party. It’s packed to the brim with playback methods, from AirPlay and Spotify Connect to a phono input for your turntable and HDMI ARC to connect your TV. It also offers great looks and sound quality, making it an enticing new way to build out a sterling stereo setup.
Excluding the name itself, Technics took its time in designing the SU-GX70, crafting a digital interface that drops a swath of tech at your fingertips and focuses on preserving audio quality.
Pulling the unit from its packaging, I noticed it feels surprisingly light, especially compared to Naim’s weighty Uniti Atom network amplifier (8/10, WIRED Recommends), my primary reference amp. This is partly due to the GX70’s fully digital amplification circuitry, which doesn’t require the hefty heat sinks of Naim’s Class A/B-style amplifier.
The Technics feels almost like the polar opposite of the Naim, trading the latter’s stout and compressed black cabinetry for a long and relatively thin frame dressed in sparkling silver (though there’s also a black version).
Technics says its amplification system is designed to preserve high-resolution audio from start to finish while still allowing for the “soft texture” of analog audio. The company has added some cool digital tricks, including specialized circuitry to preserve TV audio from the HDMI ARC input, as well as digital correction software that can account for varying speaker impedance levels and adapt the sound for your room and speaker layout (the latter requires an ioses device).
The GX70 employs dual power circuits to separate the power sent to the digital amplifier from the rest of the electronics for a quieter signal. There’s also a special Pure Audio Mode designed to shut down the HDMI input and network connections when you’re listening to a direct-input signal, though this kind of defeats the purpose of all those input options.
The GX70’s full swath of features are accessed via the Technics Audio Center app. First, though, you’ve got to use either the Google Home or Apple Home app to get the system online. It’s an odd (and mildly confusing) departure from the proprietary setup methods found in many of today’s network devices, but it worked quickly for me and provided a stable connection over weeks of use.