Recorders	Microphones/Transducers	Bat detectors	Shock-mounts
	CompactFlash	Overview	Playback	Cables
	Hard-drive	Shotgun	Headphones	Protective cases
	R-DAT	Parabolic reflector	Speakers	Additional
	MiniDisc	Omni-directional	Amplifiers	Helpful Reads
	Analog	Uni-directional	Accessories	Vendors
		Infrasonic	Preamps	Inquiries
		Hydrophones

The recording of infrasonic (ultra-low frequency) sounds requires the use of a specialized microphone. Some of the available models are relatively expensive "instrumentation" grade devices that are designed for noise and vibration analysis. These generally offer performance down to roughly 1.0 Hz and include models from Larson Davis and Bruel & Kjaer.

There is, however, an affordable, high-quality solution providing you aren't trying to capture sounds much below 4.0Hz. The Earthworks model QTC-1 is a high-performance, low-noise, omnidirectional microphone that is usable down to 4.0Hz ± 1.0dB. It utilizes standard 48-volt phantom power and terminates in a standard 3-pin XLR style connector.