Here's the response I received. Despite advertising these as supporting eARC via a firmware update last year, I am being told there are no plans to support eARC on the 2017 models. This makes me angry. If you don't plan to support the feature, be honest. Don't lie and say you added the feature.
Response By Email (Jim) (06/28/2019 04:57 PM)
Thank you for contacting Sound United Support, we value you as a customer and appreciate the opportunity to be of assistance!
My name is Jim. I am a Tier 2 Technical Support Lead for Denon and Marantz. I understand you are want to know about our plans to add eARC to our FY2017 receivers.
Technically eARC is a feature of HDMI 2.1, which although it was released at the end of 2017, there are very few devices even now that are fully HDMI 2.1 compliant.
But eARC is similar enough to ARC that on a lot of existing hardware updates could be done. I do not work with the engineering team, so I have no idea what models that is or is not an option for. I do know that just about all of our newer models are going to have it as a built in feature, right out of the box.
At this time I do not think that we have any plans to make the FY2017 models eARC compliant. But the engineering department always keeps that kind of information close to the vest. They do not want to upset people by telling them a change is coming if they can not deliver. So quite often the first that we hear about a new update feature is only a few weeks or even more often, only a few days before the feature is released.
I apologize for any frustration this causes.
If you have any further questions please feel free to contact us again.
Thank you for contacting Sound United Customer Support. Have a great day!
Tier II Technical Support Lead
Denon | Marantz | HEOS
Sound United North America