can expect in a real life broadcast from a PA system? The SPL reading is typically extrapolated to long range distances using standard accoustic formulas. This is done because... expect and in some cases will put lives at risk. How are Power Sonix speakers controlled in the cockpit by the crew? Power Sonix airborne PA can be controlled either by our hand...-held remote control (PS-RCU) or by 3rd party cockpit audio panels that have a "PA" or "AUX" output capable of sending an adequate signal to the Power Sonix amplifier. For dzus...