Podcast #1145: Technics SU-GX70  Network Audio Amplifier Review

On this week’s show we preview the upcoming WiFi 7 specification and we review the Technics SU-GX70 Network Audio Amplifier Review. We also read your emails and take a look at the week’s news.

News:

Roku just announced a free NBA channel ESPN’s Stand-Alone Streaming Service Will Be Available Through Disney+ Apple TV+ share grows in the US, but still lags behind its competitors LG TV owners should update their firmware, webOS vulnerability found in a few models

Other:

Ridiculous 150" AWOL Vision Theater Setup Roku patent invents a way to show ads over anything you plug into your TV | Ars Technica A Giga-Sunset For Gigaset IoT Devices | Hackaday WiFi 7 May be What We Have All Been Waiting For

Why WiFi 7 is the future of wireless technology

As of now, the finalized specifications for WiFi 7 (also known as 802.11be) have not been officially released, as the standard is still in development. However, based on industry discussions and proposals, some expected features of the proposed WiFi 7 specification include:

Increased Speeds: WiFi 7 is anticipated to offer even higher data rates than its predecessors, potentially reaching multi-gigabit speeds  Enhanced Efficiency: Improved spectrum efficiency will allowi for better performance in crowded environments and increased capacity for simultaneous connections. Low Latency: WiFi 7 is likely to target reduced latency to support real-time applications such as online gaming, video streaming, and video conferencing with minimal delay. Advanced Security:  Multi-User MIMO: More advanced Multi-User Multiple Input Multiple Output (MU-MIMO) technology  Orthogonal Frequency Division Multiple Access (OFDMA): The use of OFDMA will enhance spectral efficiency and enable better resource allocation for various types of traffic. Improved Beamforming: Enhanced beamforming techniques will optimize signal transmission and reception, improving network coverage and reliability. Wider Spectrum Utilization: WiFi 7 may explore the use of new frequency bands or spectrum sharing techniques to accommodate more devices and applications and deliver better performance. IoT Optimization: Features tailored for Internet of Things (IoT) devices to support the increasing number of connected devices and diverse IoT applications. Power Efficiency Enhancements: Efforts to improve power efficiency to extend battery life in wireless devices and reduce energy consumption overall.

It's important to note that these features are based on expectations and early proposals for WiFi 7. The final specifications may vary as the standard progresses through the development and approval process.

Technics SU-GX70  Network Audio Amplifier Review

Listening to music takes three elements, the music itself, the speakers, and the amplification. If one of these elements is not up to the task, your entire experience will be less than desired. Great speakers take high quality audio to even higher levels. The converse is also true, poor quality audio files will sound even worse. 

There is a middle layer that we don’t talk about as much, and that’s the amplification. Back in the 70’s all we cared about were watts! The more, the better! As a teenager I did not appreciate that not all power is created equal. Smart amplifier design can make your music sound even better and that’s what the engineers at Technics have done with the SU-GX70 Network Audio Amplifier (MSRP $1999.95).

The GX70 is a box that has something for everyone. First and foremost it's a digital amplifier that outputs a total of 80 Watts into 8 ohms and supports a ton of physical connections including: Line level x2, phono, HDMI ARC, optical x2, coaxial, USB Type A, USB Type B. Supporting HDMI ARC allows you to connect your own speakers as a soundbar alternative.  

As far as wireless connection goes, you have Wi-fi, ethernet, Bluetooth, Google Chromecast and Apple AirPlay 2. DAB (Digital Audio Broadcast) and  FM. You can also get access to Spotify, Tidal, Qobuz through the app. 

Hi Res is supported via the USB port with a DAC that can decode 32-bit/384kHz PCM and DSD512 files and it can handle MQA streams from Tidal. This is one versatile integrated amp!!

Setup

To connect the GX70 to the network you use the Apple Home (or Google Home) app. Which seemed odd to us since there is a remote control and display screen. But once you are connected to your network you can use the Technics Audio Center App to control the system. Actually, the only reason you would need the app is if you want to send MQA streams to the amp. All the radio stations that are available through the app are available on your phone or tablet via apps source apps like iHeart Radio. You can tweak the amp to dial it in for your speakers through a calibration on the amp. But it sounded really good right out of the box. 

We’ll give it an 8 out of 10 for setup, knocking off two points because you have to use Apple/Google Home to get it connected to your network. The aforementioned remote is a better way to use and interact with the amp. You pretty much just need to connect your speakers and you are good to go.

Sound

To test the audio we turned to the HT Guys Listener Playlist (Playlist available on iTunes, Amazon, and Spotify)  and listened via Airplay2, Bluetooth, and USB. All the music was played in the highest fidelity available on the platform. Both Airplay and Bluetooth lowered quality to fit within the limits of the protocol. It should be noted that the GX70 does not support AptX. 

We’ll discuss Airplay and Bluetooth together and sum it up by saying the quality was good. The only thing we’ll say is that these formats work well for convenience without sacrificing too much quality. When listening to music while doing something else, this is a nice feature. But for really listening to music we used the USB connection.

Once connected to Listened to Steely Dan, Deacon Blues (24 bit 192kHz) across three different speakers and found that the GX70 helped capture nuances in the music that we had never heard before. The sound was clean and precise. In Stevie Ray Vaughan’s Tin Pan Alley his voice was so smooth and raspy but in a good way! It's like the amp gave it more power and weight!

But can it make your walls rattle? You would think at 80W total that this was not a possibility and depending on your speakers it's not. If you have power hungry speakers they will push the amp to its limits. However, if you have efficient  speakers, it will fill the room with sound. More than we were expecting. For that we turned to UFO Strangers in the Night Live, which is an excellent album from the 1970’s, but the recording wasn’t the best. We’ll say this, the GX70 attached to Ascend Acoustics Sierra-1s, which are not extremely efficient speakers, got loud enough to where family members asked to turn down the music!

Conclusion

What we liked

A plethora of input sources (both wired and wireless)  Build Quality is first rate LCD and Remote make it easy to use and setup Outstanding detailed sound quality

Needs Improvement

Two app setup Would like to see Aptx for high quality audio from mobile devices. Needs a tad more power

The GX70 offers an elevated listening experience that brings music to life with clarity, depth, and immersive soundstaging making it a top choice for those who are serious about their music.