ADPRO VM22A, Issue 6 17Figure 9 – Daisychain cable connectionCable connection for the daisychain cable is shown in Figure 9.5.9 Using an External AmplifierThe VM22A can be configured to drive an external audio power amplifier that candeliver up to 4 Watts into an 8 ohm load. The output of the external amplifier isrouted to the VM22A internal output switcher to select one of 10 loudspeakers.When cascaded (refer to Section 5.8), only one VM22A can be active at any onetime. For connection details when cascading multiple VM22A Audio Switchers andusing an external amplifier, refer to Figure 7.6.0 SpecificationsThe ADPRO VM22A Audio Switcher provides for direct connection of up to 10microphones and 10 loudspeakers to ADPRO FastVu Digital Video & AudioTransmission System or ADPRO Fast Scan Video Transmission systems. Up to 20channels for ADPRO FastVu or 100 channels for ADPRO Fast Scan are availablewhen multiple VM22A units are ‘cascaded’. The VM22A can be configured to switchbi-directional audio to the microphone and speaker associated with the currentlydisplayed video camera, or to broadcast or listen in to a site irrespective of thecamera being viewed. The audio inputs and outputs can directly connect tomicrophones and loudspeakers. The VM22A may be used with both the FastVuTransmitters or Fast Scan Transmitters and/or Receivers.