Microtech Gefell UMT 70 S
Transformerless Condenser Microphone with 3 Polar Patterns

UMT 70 S

NOTE: Comes in satin nickel and dark bronze finishes.  Includes wood case.

Microtech Gefell's UMT 70 S condenser microphone is equipped with Microtech Gefell's proven large diameter membrane capsule, features outstanding performance, sports high sensitivity and a improved signal-to-noise ratio, as well.  This 3 pattern transformerless condenser microphone guarantees a clean and colorless sound reproduction. It is suited for instrumental and vocal soloists in radio and television broadcasting.

The pressure gradient transducer is a dual capacitor design using a single brass back plate and two large-diameter gold-plated plastic membranes.  Varying the polarization voltage applied to the membranes produces three directional characteristics: omni, cardioid and figure 8. A ring at the bottom of the microphone's head grill selects the pattern.

The omni-directional pattern shows a slight 2 dB rise in the vicinity of 10.5 kHz while the bass response is perfectly flat. The cardioid and figure 8 patterns exhibit a smooth treble boost rising which peaks at about 4dB in the range of 7 kHz. This response coupled with a slight roll-off at low frequencies is what gives the microphone its legendary "presence".  The direction of maximum sensitivity is radial to the grill (side addressed).

The newly developed transformerless circuit design substitutes the previous transformer by a symmetrical output stage yielding superb transient response combined with high RFI rejection. The circuitry also achieves wider dynamic range by lowering the self noise floor and increasing the headroom for loud signals.  A 10 dB attenuator is installed to reduce the sensitivity of the microphone when placed near extremely loud sound sources. And, a low frequency roll-off switch will reduce the proximity effect when dose miking with the cardioid or figure 8 patterns.  The microphone is equipped with a 3-pin XLR connector fitting to a microphone cable (C 70, e.g.).  The UMT 70 S uses 48 volt phantom powering according to the international standards DIN 45596 and IEC 268-15.

Specifications:

• Polar patterns: omni, cardioid, figure 8
• Acoustical operating principle: Pressure gradient transducer
• Frequency range: 40Hz - 18kHz
• Switch position "reduced bass roll-off" at 90 Hz: -10 dB ± 1 dB
• Sensitivity at 1 kHz: 7/13/8 mV/Pa ± 3 dB
• Rated impedance: 150  ohms
• Equivalent loudness level due to inherent noise:
  CCIR 468-4: 22 dB
  DIN EN 60651: 14 dB - A
• Signal-to-noise-ratio (re. 1 Pa at 1 kHz):
  CCIR-weighted: 72 dB
  A-weighted: 80 dB
• Max. SPL for THD </= 0.5 %: 139/134/139 dB
  with 10 dB preattenuation: 149/144/149 dB
• Total dynamic range of the microphone amplifier: 120 dB
• Current consumption (P 48, DIN 45596, IEC 268-15): 3 mA
• Output connector: 3-pin XLR-connector, goldplated contacts
• Weight: 290 g
• Dimensions: 217 mm x 42/21 mm

Our Part #  UMT70S