Microtech Gefell M930-STEREO-ORTF
Stereo Pair of Large Diaphragm Microphones with ORTF Stereo Bar

M930-STEREO-ORTF

NOTE: Shown above in ORTF orientation with dark bronze finish.  Also shown above and available in satin nickel finish.

Microtech Gefell's M930 ORTF large diaphragm stereo sets are simple, elegant and extremely effective tools for the discerning recording engineer. By combining a ‘modular’ approach with the exacting repeatability of a dedicated stereo mic, these true stereo sets represent real long-lasting value that truly yields more than the sum of their parts.  These workhorses are ideal for all types of stereo recording including orchestral, ensemble, instrument and choral whether these are for classical, jazz, bluegrass, folk or pop. The ability to withstand extraordinary dynamics without introducing noise further broadens their use for subtle acoustic passages to huge electric sounds that are popular today. 

ORTF, the acronym for Office de Radiodiffusion Television Francaise (French Radio and TV), requires two microphones spread by 17cm to emulate the width of human ears, angled at 110º.  The M930 ORTF system aligns the microphones in a precise horizontal spread. A series of exact laser etched markings work in conjunction with a laser-etched arrow on the microphones that provide an accurate angle measurement to ensure placement criteria is respected. Because of the permanent markings, stereo set-ups can be repeated, thus allowing the engineer to return to previous set-ups and recreate faithful repetitions.  This introduces a degree of modularity and flexibility to enable the engineer to use these premium microphones for other applications.

With the use of the large 1" M9 gold diaphragms, these wonderful condensers have the distinct advantage of superior capsule sensitivity for extraordinary detail and clarity in the more challenging low frequency region. The compact body and triangulated pedestal reduce acoustic disturbances to a minimum, further advancing the mics performance.  These microphones feature the very latest optical isolation whereby noise from unfiltered 48V phantom power is circumvented by converting the supply across an optical bridge, thus removing hash and spikes. This proprietary Gefell solution lowers microphone self noise below all others, which results in as much as a 10dB increase in headroom over comparably priced microphones.  The Gefell ORTF bar is precisely marked to attain true and repeatable ORTF set-ups. The bar should be mounted on a sturdy mic stand and set well in front of the orchestra, ensemble or instrument. Connecting the mics is simple using a pair of standard 3-pin XLR cables. We recommend using a stereo cable to ensure the cable lengths are equal. This assures the proper phase relationship is maintained.

Specifications:

• Polar pattern: Cardioid
• Acoustic operating principle: Pressure gradient transducer
• Frequency range: 40 Hz - 18 kHz
• Sensitivity at 1 kHz: 21 mV/Pa
• Output impedance: 100 ohms
• Noise level:
  - CCIR 468 - 4: 13 dB
  - DIN EN 60651: 7 dB - A
• Signal-to-noise ratio (re 1 Pa at 1 kHz):
  - CCIR - weighted: 81 dB
  - A - weighted: 87 dB
• Max. SPL for THD < 0.5%: 142 dB
• Max. output level:
  - RL = 1 kOhm: 17 dBu
  - RL = 10 kOhm: 18 dBu
• Dynamic range of electronics: 135 dB
• Current consumption (P 48, DIN 45596, IEC 268-15): 3.6 mA
• Output connector: 3-pin XLR connector goldplated contacts
• Weight without MH 93.1: 210 g
• Dimensions (L x Ø): 118 mm x 45 mm

Our Part #  M930-STEREO-ORTF