Hello,
From your description that you saw all-band interference, the audio system might use FHSS
which will negatively affect your WiFi in the 2.4GHz band. If so, Andrea's suggestion to define
all your SSIDs only on 5GHz would likely be a feasible workaround, as most WiFi clients today
have dual-band capabilities.
Rather than 'delete' your topic, I'll mark it as 'answered', thanks!