Streaming network issues - need a geek

Thanks @eranbuell, but this is not a browser issue. I'm not streaming from a computer. If you mean the NuPrime software, I am having the same issue with mconnectPlayer HD streaming to the network card in my Bricasti DAC. Both work fine when they are on the same leg of the network (controlling software/iPad and streamer), but for unrelated reasons I can't do that. 

Thanks everyone for replies so far.

@yage I bought a large Sony 4k TV, connected it to the Nighthawk router (tried both Ethernet and WiFi) and was not able to connect to any 4k service. Connection tested as functional. Connected straight to the modem via ethernet and it worked just fine. Netgear spent a lot of time with me, even replaced the router. No change. They gave up. I called Sony support and went through everything. They eventually came to the conclusion that the router was restricting bandwidth somehow. 

No bandwidth settings that I could find. What is QoS?

@ghdprentice I have three devices that have this issue with the Nighthawk - see above for Sony TV problems. The third is my Bricasti DAC with a streaming card. The Bricasti is no slouch. 

"I would get a wall wart wifi extender and plug it in next to the audio system and connect your audio ethernet cable to it." That is exactly what I wanted to do using the Nighthawk, with WiFi on the modem OFF, but bandwidth restrictions in the Nighthawk. It works, but I don't think I am getting full bandwidth. 

@mike_in_nc The model is RAX45 Nighthawk from Netgear. I did upgrade all my ethernet cables to Cat 8. 

Thanks for the Small Net Builder's forum reference.

Thanks for additional replies!

@jgoldrick It does handle 4k, but just barely, and only when connected ethernet direct to the modem. I am using the modem router, and currently also using its WiFi. The modem is in my studio. I have my desktop and my big printer as well as two ethernet lines out to where my audio system is connected to the modem. Also various WiFi devices. The reason this is not preferred is the modem is not very good with WiFi or juggling the number of devices that hit it. It is a supplied device from my service provider (Frontier - heaven help me). 

Yes, 6 Mb/s is all I get (with a strong tailwind and the neighborhood switch is functioning properly and not too many people in this part of the county are hitting it). Unfortunately it's my only option in this rural WV location. Actually compared to other locations in the state I'm flying. Would you believe only 60 miles out of DC and it is like living in a third world country, complete with lunatic fringe politicians and extremely corrupt county gov., not to mention the state gov. Don't get me started. 

When I have the Nighthawk router functioning and WiFi turned off on the modem things work pretty well except for the bandwidth problem. The Nighthawk is much better at handling multiple WiFi devices. That is why I would like to find a way to get my iPad on WiFi to the Nighthawk to see the streamers that are ethernet direct to the modem.

@ericsch I think that is what someone earlier mentioned, but I was warned that it opens you up to intrusion. It bypasses the firewall, if I understand correctly.

@jgoldrick and @mike_in_nc If I do set the modem (Arris NVG443B - supplied by service provider) to passthrough will I still be able to connect my desktop and printer in the studio via ethernet to the modem (the router is in a different location in the house)? If so will they be behind a firewall? I think not. Could I add a second router for the studio? I have a lot of devices, though not many are hitting it at any one time (sleep mode). 

@yage ​​​​@mspot The TV must be operating at 2K. I will check Starlink. Thanks for the suggestion. 

@mike_in_nc No, NOT connecting the streamers by WiFi, only ethernet. The iPad that I use to control them connects by WiFi. 

Cat 8 is infrastructure that I hope will be needed at some point. I wanted the shielding. I do not have a noise problem. I have replaced network switched power supplies with linear supplies, which does reduce noise though I can't say the difference is overwhelming. Ideally using fiber for the last segment would remove all noise, but neither of my streamers are able to accept fiber. Yes, there are ways around that... maybe someday, but bigger picture stuff first.

I am using an unswitched hub and I have indeed been into the modem and router settings. 

I think I need to draw schematics of my current and preferred network. I know it is hard to get the picture from words alone. Later today or tomorrow. 

Thanks to all.