Stereo speaker leads often act as antennas to pick up RF signals. What is one method you can use to minimize this effect?

Any piece of wire can act as an antenna if it is long enough to be a significant fraction of a radio wavelength. Stereo speaker leads are often the perfect length to resonate with and pick up High Frequency (HF) amateur radio signals. By simply shortening the leads, you change their resonant frequency, making them less efficient at picking up the specific RF signals being transmitted. This is often the first and easiest step in resolving RF interference in consumer electronics. Lengthening the leads might inadvertently tune them better to the transmitting frequency. Using capacitors in series blocks low-frequency audio, while attenuators simply reduce the volume of the speakers without effectively targeting the RF interference.