bids are invited for boundary layer microphone chairman unit - it should be pre-polarised condenser microphone having cardioid or better polar pattern, shall have frequency response of 42hz to 20khz, should have max spl level of 135db or more, it should support phantom power from 12v to 48v, should have sensitivity of 10mv/pa or better and dynamic range of 111db(a), should come with mute/unmute button, should be rf interference free from other wireless devices, should have muted/unmuted status led indication and logic output for third party integration for control camera with mute on off control for all microphone , boundary layer microphone delegation unit - it should be pre-polarised condenser microphone having cardioid or better polar pattern, shall have frequency response of 42hz to 20khz, should have max spl level of 135db or more, it should support phantom power from 12v to 48v, should have sensitivity of 10mv/pa or better and dynamic range of 111db(a), should come with mute/unmute button, should be rf interference free from other wireless devices, should have muted/unmuted status led indication and logic output for third party integration for control camera. , fixed audio dsp - 12 mic/line level inputs with aec, 8mic/line level outputs or better, up to up to 8 channels of configurable usb audio with serial rs232 port, 4 pin gpio or better should be support port authentication via ieee 802.1x, frequency response 20hz to 20 khz or better, maximum input +24dbu, +6dbu, 0dbu, -31dbu, sample rate 48khz, sample rate a/d-d/a converters 24 bit or better with 4 channel mic/line input expander with aec and poe+ complete ce marked, ul listed, and rohs complaint as per the requirement. 5 year warranty. , two way column speaker - nominal impedance 4 ohm or better, sensitivity 94 db or better, frequency response 140 hz to 18 khz, programmable power 140 watt or better, power tapping on 70v 3 pt 75, 7 pt 5, 15, 30 w & on 100v 7 pt 5, 15, 30, 60 w or better, with mounting acce