Description Product Reviews Page port pre-amp / expander Pre-amplifies low level audio to remote sites Provides virtually unlimitedexpansion for any system (150 Valcom one-way speakers per VC-V-1094) Master volume control for entire system or groups of remote speakers Isolates page port from speaker lines Output impedance: 600ohm Power requirements: -24 Vdc, 45 mA Dimensions: 4.44″H x 2.75″W x 2.88″D VALCOM POWER UNIT (-1) Valcom Power Units Every Valcom product is marked with either a positive, negative or neutral power unit. Simply add up the negative power units and then purchase a power supply with a greater value than the total power consumption of the system. If you have extra power units you can add speakers to the system at a later date, extra power is OK lower power will cause a performance problem on your paging system. One Valcom power unit = 50 mA, -24 Vdc 0 Reviews Hide Reviews Product Reviews