What should I upgrade next in my system?

Thank you for all the great ideas. Even though I subscribe to both Tidal and Qobuz, I mostly stream through a 4K Apple TV using YouTube Music. The reason I use YouTube Music is because I like live video with my concert recordings and they seem to have the most live concert videos, and the sound quality through the Apple TV seems to be pretty good. I have a 120-inch Sony laser projector in a dedicated media room. 90% of my time in my media room I am watching concert videos such as the Eagles in Melbourne, John Mayer in LA, Tears for Fears live from Village Studios, Steely Dan, Morgan Wallen live recordings from Apple Studio, etc. I use the Oppo 203 as the source when watching Blu-ray versions of these concerts, concerts I download to my 5T Seagate hard drive from the internet, or very seldom a SACD. Even though I have a nice set of surround speakers, I listen to two channel 95% of the time though the Martin Logan 15A's. I have some acoustic treatments in the room, but because of the room size, I am somewhat limited. All my previous rooms where filled with ARC treatments. It definitely sounds like upgrading the Apple TV is the way to go, but how do I do that without losing the video component or making the system overly complicated? Kaleidoscope seems excessively expensive, and I do not watch many movies, mostly only concerts, which I find easily through downloads onto to my multiple 5T Seagate hard drives which are totally full of concert videos I have found over the past 30 years.

I also agree with post by @mclinnguy … it is difficult to answer until his additional questions are answered.  Your speakers and amplification are solid performers.  However, I cannot comment on the theater processors you are using for I do not have any experience with these units.  I also recommend starting with the digital front end.  If your budget is $30k, I would spend half on a DAC and half on a streamer/server.  My favorites that get you to near world class performance are a Mola Mola Tambaqui or Bricasti M1 with an Aurender N20, preowned W20SE or Grimm.  

I appreciate the DAC and Streamer recommendations, but my budget is probably not 30K (even though it was on my speakers) until I am convinced that spending 10K on a previously-owned DAC and Streamer does not get me 90% of the 30K performance. Am I wrong in thinking that? 

Would the new DAC and Streamer eliminate my Anthem AVM 60 Preamplifier and Processor from my system? If so, how do I use my Oppo 203, Cox Cable and Apple TV through them?

How bad is the 4K Apple TV streamer and Anthem processor I am currently using for Tidal, Qobuz, and YouTube Music? I assume pretty bad...

I do love how easy the 4K Apple TV is to use.

+1 @deep_333 Think of the room as one of your most important components.

How bad is the 4K Apple TV streamer and Anthem processor I am currently using for Tidal, Qobuz, and YouTube Music? I assume pretty bad...

Better than Apple TV can be had for sure. Easy peasy.

Given your home theater set up @rickguild using a vendor to jigger your system might be the way to go. Most of us here are two channel sit in the chair and listen types. Period. There are some RtoR types but most members use vinyl and/or streaming. I’m all in on Grimm streamers (their one box combo or their unit with a stand alone DAC) too but at that level there are plenty of others just as excellent. But the room makes such a big difference. So there’s that.

@rickguild No, your Anthem prepro is the heart of your multichannel system and shouldn’t be going anywhere.

These are 2 channel guys on this forum, who are probably quite confused about your rig.

A higher quality streamer transport into your Anthem prepro could possibly improve the sound quality. But, no, you wouldn’t need a 10000 dollar streamer for that??!! Try maybe a 300 dollar Wiim Ultra streamer as the transport into your prepro, with lots of other user friendly features. I know your Anthem prepro won’t let you do any manual PEQ, etc.

A power conditioner such as the Audioquest Niagara or PowerQuest 707 will improve the sound.

The most important thing on multichannel rigs is room treatment, but, if you are set up in a living room and wife won’t let you, well.... there’s your bottle neck.

On a different note, your Anthem Prepro is now almost 10 years since release. A sonic upgrade for it might be the newer Marantz AV10 prepro. But, you need to know how to set up a prepro, read the manual from cover to cover, run a calibration correctly, do finer tweaks from there, etc, ask questions on avsforum maybe. The Marantz AV10 already came with all kinds of streaming feaures and a great DAC where you didn’t need any other dacs or streamers...no Grimm...no Brimm for 10k needed..

I appreciate the DAC and Streamer recommendations, but my budget is probably not 30K (even though it was on my speakers) until I am convinced that spending 10K on a previously-owned DAC and Streamer does not get me 90% of the 30K performance. Am I wrong in thinking that?

Would the new DAC and Streamer eliminate my Anthem AVM 60 Preamplifier and Processor from my system? If so, how do I use my Oppo 203, Cox Cable and Apple TV through them?

How bad is the 4K Apple TV streamer and Anthem processor I am currently using for Tidal, Qobuz, and YouTube Music? I assume pretty bad...

I do love how easy the 4K Apple TV is to use.