The Onkyo - TX – NR6100 7.2 Channel THX Certified Network A/V Receiver is a more than capable A/V receiver. It works great with ATMOS / DTS-X speaker set ups. Comes with several handy apps and streaming features. In my experience, it was relatively easy to use and set up. It lacks a few features, and its design and interface are beginning to feel a bit dated. I had a few nitpicks during my tests but, of all the A/V receivers I have owned over the last twenty years, this is easily my favorite. I received the Onkyo - TX – NR6100 7.2 Channel THX Certified Network Receiver as a part of a Klipsch Reference package containing Series 50M Bookshelf Speakers, a Series 30C Center Channel Speaker, Series 600F Floor Standing Speakers, Series 40SA Surround Sound Speakers, and the Klipsch Series 101SW – 10’ subwoofer. And I absolutely love this system. Movies and music sound amazing. For the last few years, it has been difficult to find many home theater receivers in store. It’s been even harder to find a HDMI 2.1 receiver. Some explanations… HDMI 2.0 allows for 4K at 60fps. HDMI 2.1 allows for 4K at 120fps. The more frames per minute, the smoother video playback will often appear. This means video games will have smoother performance. It’s easier to track moving objects with higher FPS. With the XBOX Series X and Playstation 5, HDMI 2.1 has become a feature in high demand. Some receivers advertise support for HDMI 2.1 only for that to not truly be accurate. The TX-NR6100 does support 8K at 60FPS and 4K at 120FPS out of the box. Setup and Use: During first use, the receiver will walk you through initial set up via an onscreen display. As part of the setup, you will have the option to balance the audio system via the included microphone. I’m not usually impressed with microphone calibrations, but this calibration worked great. I didn’t feel the need to tweak any distance or crossover settings after setup. The onscreen interface was easy to use. The NET input will allow you to setup and use streaming audio services or playback audio from a USB stick. Movie playback wowed me. If you are like me, you are probably wondering how an Atmos setup works with movies and music not designed for Atmos. And, in my opinion, it works well. The receiver has various listening modes. When I wanted to upconvert non Atmos or non DTS-X content, I would change the movie listening mode to the Dolby or DTS-X listening mode that would then automatically upconvert the audio. That way, my receiver was utilizing all my speakers during playback of movies that were only designed for 5.1 setups. After initial setup, I connected a LAN cable and updated the firmware. As of the time of my review, I was using firmware R113-0307-0030-0031. I had no problems with stability or features not working after the firmware update. The update process was simple and painless. Troubleshooting: I had a few troubleshooting issues during my tests. I noticed audio glitching on an LG TV using eARC to deliver Atmos content to the receiver. In addition, I had problems where the receiver would be stuck on “initializing” whenever I tried to load up the visual interface on the TV. Turned out my difficulties were caused by poor HDMI cables. The cables were advertised for eARC and 8K, but changing HDMI cable brands solved my problems. I tell you this, because if you experience something similar, try changing your HDMI cable to a different brand. There are a lot of variables when you are setting up an AV receiver. You have your speaker cable, your speaker connections, your speakers, your TV, your HDMI source, and your HDMI cables. Any one of those can cause instability or problems in the system. But, I felt fortunate to isolate the problem to the HDMI cables. And it was the HDMI cable brand as I tried multiple cables from the same company at various lengths and they all had the same problem. Also, the receiver has Bluetooth connection built in, but it didn’t like my Samsung phone for some reason. For iPhones and Pixel phones, I had no problems with the Bluetooth connection. But, for some reason, my Samsung Galaxy S-21 struggled a bit with the connection. I eventually got it paired and working, but it never sounded great compared to the audio coming from the other phones. However, I found the whole thing mute as Chromecast, AirPlay, and DTS-Play-Fi were better options. Streaming audio via Chromecast from my phone sounded much better. I can’t chalk that up to a receiver problem when every other phone or tablet I paired worked great. Nitpicks: I feel like the boxy design of the receiver is starting to feel a bit dated. Other receiver brands are implementing more modern designs with curved fronts. Also, I have used other receivers that would identify my HDMI source and change the label for the input accordingly. As is, I can change the label on the TX-NR6100, but I must do it manually. I wish it were a bit simpler to