RDL ST-VOX1 Installation Voice Operated RelayThe ST VOX1 is an Audio Controlled Relay in the STICK ON series. When used in intercom or talkback applications, the ST VOX1 may be triggered directly from an unbalanced microphone. In many such installations the microphone or other audio source must be preamplified, making the ST VOX1 an ideal mate to work with the STM 1 preamp. The unbalanced output from the STM 1 can be used to trigger the ST VOX1, while the STM 1 balanced output is used for the