Description Product Reviews Valcom V1020C 8″ Self Amplified Ceiling Speaker Exceptional Voice & Music Reproduction Contains Its Own Built-In Amplifier White Epoxy Finish Screwdriver Adjustable Volume Control in Front “Pop-On/Pop-Off” Volume Control (V-1020C & V-1220) Available In Custom Color Optional Bridges and Backboxes -1 Valcom Power Units 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