I'm not sure why no one shared their experiments with router configuration that can improve sound quality after years of audiophile network switch hitting mainstream audiophile. So here's my recommendation for you guys to try and see if it will help in your system.
1. Use WiFi 2.4GHz for lower noise level
2. Setup 2.4GHz to use legacy mode (So you can disable WMM)
3. Disable WMM Support for lowest possible latency
Although your maximum bandwidth will be limited to 54Mbps only. However, you can get smooth bandwidth with lowest ping spikes with more micro detail. I'm quite surprised how WiFi can sound better than my expectations.
And if you want to have faster internet, you can always use 5GHz network and leave 2.4GHz for dedicated audio only. Some other options also affected sound quality too and I'm still testing to find optimal configuration.