Switcher is a professional 4-channel audio switcher for the demanding user. The high impedance balanced input circuits reduce loading effects and noise on the incoming signals. The low output impedance of 66ohms provides a maximum level of +24dBu. The input and output connections are printed circuit spring terminal blocks. The terminal blocks provide reliable clamping action for secure and reliable operation due to a force amplifying hinge motion. A nine pin female D connector provides serial interface to computer or modem for RS-232 control which Is standard in all units. The switcher is available in other models for mono or four channel operation. It is an audio-only switcher with digital switching logic combined with high performance audio circuitry to form the foundation for the next generation of audio routing switchers.