I have an SG electret microphone (see figure below) connected to my phone, and it produces pretty bad signals (keeps mostly the low frequencies while killing the high frequencies). I suspect it is the microphone (although it might be something else in the circuit). The microphone has a static resistance (without any voltage applied) not lower than 1.5KOhm (I can't measure it exactly since I can't take it out of the circuit, and there are additional things connected in parallel to it). I can't find datasheet on it, so maybe someone had a deal with them before. When I apply voltage to it (1 Volt), the current through it is 0.2mA.
The question is: are these parameters OK for this microphone? Or it is damaged?