The TEF04™ is an omni directional, 1/2" diameter, electret condenser microphone suitable for General Purpose acoustical measurements and Pro Audio applications where a free field omni pattern is specified. The TEF04 provides levels of accuracy that meet the frequency response specifications of more expensive titanium diaphram mics, while providing the ruggedness of a mylar diaphram for field use. The mic circuit has been designed to operate on phantom voltages from the 12VDC utilized by many RTA's to the 48VDC provided by mixing consoles and devices such as the TEF25 analyzer. Manufactured by Gold Line in the USA, the precision machined stainless steel body provides exacting dimensions suitable for use with Acoustic Calibrators. The TEF04 is standard equipment in the Gold Line's ProKIT and TEFKit Measurement Systems.