Electret condenser elements
Pro – nice signal-to-noise.
Pro – cheap.. One dollar a piece!
Con – frequency response rolls off in zone of interest
Types of Infrasonic Microphones
Machined silicon pressure transducer
Pro – response is linear down to DC.
Pro – relatively cheap - $100 a piece
Con – doesn’t filter out barometric pressure fluctuations
Con – Inferior signal-to-noise
Microbarometer (MB2000)
Pro – Flat response
Pro – very low noise
Con – a bit pricey (~$10,000)
Con – difficult to manage for field deployments