1. Keep the main speaker as far away from the infrared alarm as possible, so that the current sound will be reduced or disappeared.
2. Install a rubber damping layer between the transformer and the fixed plate.
3. Reduce thermal noise by replacing low-noise components or reducing the workload of components.
4. If you can't stay away from the interference source, use the shielding method and use all the cables of the sound with shielding layer.