Can both users speak at the same time, or is only one microphone active?

This depends on the specific splitter.

• Standard Training Cables: Often, these are "live" for both microphones, meaning both users can be heard.

• Switch/Mute Boxes: Many professional training splitters come with a switch box that allows the supervisor to mute their own microphone (listening only) or activate it to join the conversation.

• Simple Y-Cables: Some basic splitters may only support one active microphone at a time to prevent signal interference.