Supervised Power Boosters The SAFEPATH Supervised Audio and Audio/Strobe Power Boosters with 24VDC battery backup capabilities are designed for the SAFEPATH4 Voice Evacuation System and SAFEPATH Mass Notification System to provide for additional supervised audio power for live voice or pre-recorded messages. Multiple SPB-320, SPB-160 and SPB-80/4 Audio Boosters can be inter-connected to accommodate large installations with supervised audio power and also supervised and synchronized strobe power requirements. SPB-320 - 320 Watt Supervised Audio Power Booster includes four 80 watt circuits SPB-160 - 160 Watt Supervised Audio Power Booster includes two 80 watt circuits SPB-80/4 - 80 Watt Supervised Audio Power Booster includes one 80 watt circuit and two 2 amp strobe circuits (4 amps total)