bids are invited for pre amplifier - six zone two channel distribution system , call station - six zone call station having status led indicators , booster amplifier - power amplifier 480 watt, 8 ohm output , mixer amplifier - output power 60w, support bluetooth, pen drive and other music source , wall mount speaker - cabinet 6-watt, suitable for both music and speech , ceiling speaker - 6 watt celing, suitable for both music and speech , speaker cable - best quality 2 core 1.5 sq mm , pvc pipes with accessories - 25 mm pvc pipe with accessories , rack mount - 17 u metallic, power manager, cable manager, lock , connector and accessories - best quality connectors and other accessories , installation, testing and commissioning - including cable and pvc pipe laying total quantity : 6058