I have a mic bought fairly cheaply years ago. It is an omni sdc electret type EM-103L made by Altai. I can't find any data on it anywhere, possibly because it is so cheap it is beneath the notice of serious mic enthusiasts. However I have measured its high frequency response as best I can by placing it at various distances from three different high quality speakers, and taking an average of all the response figures obtained, and surprisingly the response from 500Hz to 15kHz is +/- 2.5dB. Does anyone know anything about this mic? How does its signal/hiss compare with newer mics?