supply and installation of sound system for video conferencing at conference room, computer centre nit meghalaya as per tender document , microphone boundary layer microphone : supply of cardioid pre-polarized condenser on-table boundary layer microphone with 3-pin xlr, programmable microphone button for toggle on / off, ptm, ptt and permanent, bi-color led ring for status indication, ttl logic connector with logic inputs and outputs, frequency response of 40 hz - 20, 000 hz or better, sensitivity of 10 mv / pa or better, nominal impedance at 1 khz of 200 o or better, current consumption of 5.3 ma or better, maximum spl of 140 db or better, operating on 48 v phantom power. , dsp supply of digital signal processor ( dsp ) with scripting engine 12xi / o card ( or inbuilt equivalent ) with dual-channel microphone or line level input, switchable 48v phantom power, software-controlled functionality. 8xi / o card ( or inbuilt equivalent ) with dual-channel line level output, software-controlled functionality. i / o card ( or inbuilt equivalent ) with 2x2 usb 2.0 input / output, hid command-capable for uc status sync. software-licensed acoustic echo cancellation ( aec eight channel at 250ms, 16 channel at 100ms delay. , loudspeaker supply of 2-way cabinet loudspeaker, lf driver4” & hf driver1dome tweeter; max power handling70w @ 8 ohms; multiple 100v taps :24w / 12w / 6w; frequency range65hz – 20khz ; sensitivity86 db and max spl101 db; coverage of 130° x 130° ( h x v ) ; ip40 rated; operating temperature -20°c to 60°c; abs plastic housing with steel grill , amplifier supply of quad channel energy star rated class d amplifier , 4 x 100w @4?, 4 x 50w @8?, 2 x 200w @8? bridge, active crossover , protection circuit : dc, overheating, overload, signal limiting, xlr line inputs , 2-pin terminal outputs , 1u 19 rackmountable.