A good rule of thumb is that a new 4K compatible receiver should support the same level of connectivity that your 4K TV does.
If your TV has an HDCP 2.2-compatible input, then your new receiver should have HDCP 2.2 as well.
Do you really need a 4k receiver?
High-speed HDMI cables can carry 4K signals. The connection in your TV or receiver is what needs a specific HDMI version, and for 4K to work you need HDMI 2.0 or 2.0a. If you’ve bought your TV and other gear within the last 2 years, you’re probably all set (and your cables will almost certainly work).
Do I need a 4k box for my 4k TV?
4K Compatible HDMI Cable
There is some debate about whether this is really necessary, but the majority of TV manufacturers recommend an advanced HDMI cable optimized to handle Ultra HD content. The good news is that the ones you have are likely already 4K capable, so there’s no need to run out and buy one immediately.
Will 4k pass through my receiver?
A feature of an A/V receiver that allows a video source to pass unaffected through the receiver to a 4K TV without any processing. For example, all 4K content from a 4K source or an upscaling 4K Blu-ray player must be passed directly to the 4K TV.
Is 4k HDMI cable necessary?
When it comes down to 4K TV, you do not need to pick up special HDMI cables. In other words, don’t immediately toss out your old HDMI cables for the newest HDMI 2.0a or 2.1. The HDMI cable standard can impact color and resolution, but newer versions are not required for 4K TV.