Basic Qualification · B-008 Interference and suppression · B-008-002-009
Stereo speaker leads often act as antennas to pick up RF signals. What is one method you can use to minimize this effect?
- A Connect the speakers through series capacitors
- B Shorten the leads
- C Lengthen the leads
- D Connect the speakers through audio attenuators
Correct answer: B — Shorten the leads. From the official ISED question bank, verified word for word.
Why
Shortening the speaker leads reduces the length of wire acting as an antenna, which directly lowers its ability to pick up unwanted radio frequency signals. The full explanation — and one for every question — is in Pro.
Practise this section
When things interfere: harmonics, overload, RFI to and from your station, filters, ferrites and how to fix the neighbour's TV.