When performing the conducted emission test, it is essential to keep the AC power cable away from the speaker cables. This prevents stray signals from coupling to power source and other potential unintended radiators or conductors.

When ferrite bead filters are used, an AC to DC adapter with an EMI filter is required to pass conducted EMI. Most applications (for example TVs, Voice Controlled Speakers, Wireless Speakers and Sound Bars) that need a 110 V / 220 V AC power supply usually have already included an EMI filter in the AC to DC adapter. Some applications use DC power supplies. They need a simple EMI filter on the PVDD supply. Refer to this application note: AN-2162 Simple Success With Conducted EMI From DC to DC Converters (SNVA489C).