What is the approximate bandwidth of a typical single sideband (SSB) voice signal?

A typical human voice contains frequencies ranging from about 300 Hz to 3000 Hz. Because Single Sideband (SSB) transmits only one sideband of these voice frequencies and completely suppresses the carrier, the radio frequency bandwidth perfectly matches the audio frequency bandwidth. Therefore, a standard SSB voice signal is approximately 3 kHz wide. This compact footprint makes SSB highly efficient and popular for long-distance communication on crowded HF bands. The other options represent different modes: 1 kHz is closer to digital modes or wide CW, 6 kHz represents traditional full AM (which transmits both 3 kHz sidebands), and 15 kHz is typical for amateur FM voice.