To overcome increasing congestion in the 2.4Ghz range we recommend only waireless access points that have both 2.4Ghz and 5Ghz radios and promoting use of the 5Ghz radio instead of 2.4Ghz. Most modern mobiles support 5Ghz and it is designed for higher performance streaming systems such as Flexicast Wifi Audio. It is common for 2.4Ghz Wifi networks to deliver poor performance in pub/club situations. Some WAPs also support AC mode, these are a good option but we recommend setting them up as separate SSIDs for the 2 bands rather than using the AC mode if you are already experiencing 2.4Ghz interference.
2.4Ghz and 5Ghz are open bands that are becoming increasingly congested with network and non-network traffic. Some sites may find that the 2.4Ghz band has clashes occurring and these may be enough to interfere with delivery of a reliable audio service.
Many newer phones can also support the 5Ghz band and this will give customers an alternative if clashes on your Wifi are occurring.
We would recommend installing a router with both 2.4Ghz and 5Ghz support to give the best chance of a solid long-term outcome. Many commercial grade and better domestic grade wireless access points support the 5Ghz band and will allow you to offer 2 SSIDs (effectively 2 wifi networks) to customers to choose which works best for them.
Some WAPs also support AC mode (IEEE 802.11ac) whilst these units are a good option as they generally will support twin SSIDs covering the 2 bands, we do not recommend using the AC mode for sites that are suffering 2.4Ghz interference as in our experience it affects the AC mode too.
While use of the 5Ghz band offers higher throughput, its shorter wavelength has more trouble penetrating walls and obstructions, but as we suggest you offer both bands, an option with lack of congestion on 5Ghz is worth the effort.