Microtech Gefell Precision Acoustics
Located not far from us in Thuringia, Microtech Gefell has been the reference for top-tier acoustic metrology for decades. The product family focuses on long-term stable condenser capsules and preamplifiers (IEPE/ICP, LEMO, P48) as well as sound intensity probes and weatherproof outdoor microphones. New to the lineup is the digital MV 240 USB measurement microphone, setting new standards in dynamic range and stability. The portfolio also includes ultra-low-noise systems (< 6 dB(A)) for demanding measurements on very quiet devices. Microtech Gefell consistently focuses on Class 1 technology according to DIN EN / IEC 61672 with PTB type approval. We advise you on the correct configuration of your measurement chain and provide a formal PDF quotation for procurement and project approval.
Equipment Categories
Select a category to filter matching capsules, preamps, or adapters in the explorer:
Interactive Measurement Chain Configurator (200V & IEPE)
Select capsule, preamplifier, and accessories. The system automatically validates electrical polarization compatibility and inserts required mechanical thread adapters.
Step 1: Select Microphone Capsule
Filter by size, sound field equalization, and polarization voltage:
Step 2: Select Matching Preamplifier
Electrically and mechanically compatible preamplifiers (IEPE / 200V LEMO / P48 / Digital):
Step 3: Add Compatible Accessories & Calibrator
Matching windscreens, nose cones, holders, cables, and calibrators:
Configured Measurement Chain Summary
100% PAngVAdds capsule, preamplifier & required adapter to quote at once.
Parametric MTG Catalog (All SKUs)
Filter by acoustic key specs, sound pressure limits, normative classes, or search by MTG part number:
Acoustic Engineering Guide
Physical selection criteria for measurement capsules and polarization types:
1. Sound Field Equalization: Free-Field, Diffuse-Field, or Pressure-Field?
Every microphone body forms an obstacle in the acoustic sound field. As the acoustic wavelength approaches the capsule diameter, pressure builds up in front of the diaphragm. For a 1/2-inch capsule, this causes an on-axis boost of +8 to +9 dB at 20 kHz. Measurement capsules are therefore mechanically equalized for specific acoustic environments:
Diaphragm damping is engineered to yield a flat frequency response when sound strikes the capsule frontally (0° on-axis). The pressure buildup is counterbalanced by mechanical acoustic tuning.
In reverberant spaces, sound waves arrive from all spatial directions simultaneously. The capsule is equalized so that the integrated energetic sum over all incident angles results in a flat response.
Uncorrected for free-field diffraction. They measure the genuine, physical sound pressure directly at the diaphragm surface.
2. Polarization Voltage: 200V External vs. 0V Prepolarized (IEPE)
A condenser measurement microphone requires an electrostatic charge on its diaphragm to convert acoustic motion into voltage:
A 200V DC bias is supplied to the backplate via the preamplifier. Offers maximum temperature endurance (up to +150 °C) and negligible long-term drift. Requires 7-pin LEMO cables and power supplies (e.g. MN 921) or P48 converters (MV 225).
The fixed electrode contains a permanently fused dielectric charge layer. The capsule needs zero external bias voltage (0V). Combined with an IEPE preamplifier (MV 210, MV 220S), standard inexpensive coaxial BNC cables carry both constant-current power and signal.
Mounting a 200V capsule (e.g. MK 221 or MK 102) on a 0V IEPE preamplifier (MV 210) will not damage hardware, but yields zero signal because the diaphragm has no charge. Conversely, 200V bias applied to a 0V electret capsule can degrade the dielectric. Always use our configurator to verify matching combinations.