Hey, i have two microphones I'm looking to use for work with our AVAYA phones. I'm trying to decide which will be better. Here are the specs: Mic A: Sensitivity: -40 ± 3dB Impedance: Max. 2.2 ㏀ Standard Power Supply: 2.0 V DC Current Consumption: Max. 0.5 mA Sensitivity Reduction: Within-3dB at 1.5V S/N: More than 58dB Omnidirectional Mic B: Headphone frequency response : 20Hz to 20kHz (20Hz to 8kHz with +\- 10% variance) Headphone impedance : 16 Ohms Transponder frequency response : 20Hz to 20kHz Headphone power : 5mW (Max 10mW) Transponder sensitivity: -46dB +/- 3dB Throat-Mic I can not figure our which is better or more sensitive. The problem we are currently having is that the HW261N headset we are using pick up just about everything and we can not have that in a call center.