bids are invited for chairman unit f / conference system - chairman unit f / conference systemwith priority switch, gooseneck microphone with bright&clear ring ledindicator and foam windshield current consumption:maximum 50mamicrophone auto switch-off time:60-90seconds input:line, output:line, speaker:maximum input 300mw impedance:16ohm, controls:priority switchtalk switch, speaker volume control headphone volume controlaccessories:interconnecting cables of minimum 2.5m lengths , delegate unit f / conference system - delegate unit f / conference systemgooseneck microphone with bright & clear ring led indicator and foamwindshield, current consumption:50ma maximum, microphone autoswitch-off time: 60 to 90 seconds, input: line, output: line, speaker: maximum input 300mw impedance 16 ohms, controls: talk switch, speaker volume control, headphone volume control, accessories:interconnecting cables of minimum 2.5 meter lengths. , wireless lapel microphone - wireless lapel microphonewith tie clip reception mode:non-diversity receiver frequency band:vhfhi-band:160-245mhz frequency stability:0.005% modulation mode:fm, audio dynamic range : >100db s / n / ratio:>90db frequencyresponse:50hz-15khz+ / - 3db power supply for base unit:dc12v - 18v300ma with ac / dc adaptor 115 / 230v 50 / 60hz power supply for handset:9vbattery mic type:dynamic, r / f power output for microphone:15mw , wireless hand held microphone - wireless hand held microphone ( 1 ) reception mode : non - diversity receiver, ( 2 ) frequency band :vhf - hi band 160-245 mhz, ( 3 ) modulation mode : fm, ( 4 ) audio dynamicrange : >100db, ( 5 ) s / n ratio : >90db, ( 6 ) frequency response :50hz-15khz+ / -3db, ( 7 ) power supply for base unit : dc 12-18v, 300mawith ac / dc adaptor 230v, 50 / 60hz, ( 8 ) power supply for hand set : 9vbattery, ( 9 ) mic type : dynamic, ( 10 ) r / f power o / p : 15mw, , central amplifier - central amplifierfor conference system for connecting minimum 50 delegate units lineoutput:17.5vdc / 3a, max:34dbv, 20mv power output:minimum 50w rms at 2%thd 90w max minimum input:1xmic 1.0mv / 2ko, balanced 2xmic 0.65mv / 4.7ko, unbalanced 1xaux 100mv / 470 ko, unbalanced frequency response:60-14, oohz ( ? 3db ) s / n ratio:greater than 600b tone controls:bass: ( - ) 10 dbat 100hz treble ( - ) 100b at 10khz master volume control preamp / receiveroutput:200mv / 600 o line output:1v / 1ko send output:200mv / 600 o returninput:200mv / 10ko speaker output:4 o, 8 o, 16 o, 70v & 100v powerrequirement:ac200-240v and dc:24v battery as standby powerconsumption:maximum 250va , high quality flush mount ceiling speaker - high quality flush mount ceiling speakerminimum 6w with 100v lmt tap frequency response:100-15000hz, spl 1w / 1m92db spring loaded clamp for easy mounting size:maximum 6inche , column speaker, 150-10000hz - column speaker, 150-10000hzwith matching transformer:input power:minimum 15w rms, power taps:15 / 10w, impedance voltage:100v, , erect / install, test&commission - erect / install, test&commission total quantity : 1