I too have Asus AC3100 (AWESOME router!) and NAD C388 w/BluOS2i MDC module (essentially same as Node 2i) connected by WiFi.
Whatever Ethernet cable (Cat 5e/6/7/8/etc.) proponents say about improved SQ is BS. WiFi with the specific units mentioned above works AWESOME! Notice I said SQ. I’ve never had bad SQ from the WiFi connection. However, I have had music stop playing due to poor WiFi connection - read more about Roaming Block List below.
The bandwidth you mentioned is way more than necessary. We have 100MB service, and simultaneously doing the following without any issues:
- 2x kids playing Xbox1S’s MMO’s with VOIP service running on top (for headset banter)
- Streaming Netflix Ultra (4k with HDR and surround) in the HT system on another Xbox1S.
- Me streaming Amazon UltraHD with BluOS
Another member mentioned adjusting the router to prioritize audio...
Yes, this is possible. Once logged-in to the Asus AC3100, on the left side menu click "Adaptive QoS". There will be 3 tabs in the main screen, "Bandwidth Monitor", "QoS", "Web History" - click "QoS".
Enable QoS = Yes
QoS Type = Adaptive QoS
Bandwidth Setting = Automatic
Select = Media Streaming
Click Apply (router will do its thing, and setting will be in effect)
The above is quick & dirty way to do it. Way more trickery is possible with more advanced setting adjustments.
If you have a marginally weak WiFi signal, music stream may suddenly pause - then spontaneously restart. If you have a fully-weak WiFi signal, music may pause and not come back. Think of this as similar to having a partially or fully damaged Cat cable - results are expected. Notice there is never static or noise... music just stops (same as it would with damaged cable).
My wireless network consists of additional routers. As you may know, AC3100 is MESH-capable. I have the AC3100 as primary, with two Asus AC1900 routers in AiMesh mode to seamlessly (for mobile devices) cover more ground (4,000 sqft house on 1 acre). These routers also allow capability to specify devices stay on a particular router in the mesh network (for devices that aren’t mobile), which can be handy, since mesh will move devices around to load-balance. I have the BluOS2i (NAD MDC module) locked to the closest router (and only router not located in the basement). This feature is called "Roaming Block List" - find it in left-side menu Advanced Settings/Wireless/Roaming Block List.
Hope this helps - Good luck! If you need more help with router settings PM me - happy to help.