UltraSoundGate 1/4″ Mic Power Module with 7-pin LEMO 1B input connector

part # 40017

The 1/4″ microphone power module allows to connect 1/4″ (or 1/8″) measurement microphones directly to the UltraSoundGate xx16x units, which can greatly simplify the use of measurement microphones in the field (otherwise a separate power supply module / conditioning amplifier would be required). It is powered from the UltraSoundGate base unit and includes a very low-noise +30 dB preamplifier* and a switchable 15 kHz high pass filter.

  • Input connector : female 7-pin LEMO 1B socket
  • Frequency range : 150 Hz … 200 kHz
  • Gain : 30 dB
  • Inherent noise (20Hz-20kHz, unweighted, 150 ohm termination) : 0.5 µV (-125 dBu)
  • Optional high-pass filter cut-off frequency : 15 kHz
  • Preamplifier supply voltage (LEMO pin 6): 28 V
  • Max preamplifier supply current available at pin 6: 1 mA
  • Polarization voltage (LEMO pin 3): 200 V (derived from the USG base unit)
  • Current drawn from the +5V USG base unit power supply rail (G.R.A.S. 26AC attached): 25 mA
  • Output connector: male XLR-5 socket
  • Physical dimensions : 85 x 32 x 26 mm
  • Weight : 90 g

* This fixed-gain preamplifier is considerably quieter than for instance the G.R.A.S. Power Module Type 12AK or the B&K NEXUS Conditioning Amplifiers! 

Compatible 1/4″ preamplifiers are for instance:
GRAS 26AC / 26AL,
GRAS 46DP-1 1/8″ in combination with a GRAS AA0091 3 m LEMO 5-pin – LEMO 7-pin Cable,
B&K 2670,
Microtech Gefell MV 302.

Note that this power module will only work with preamplifiers that come with a 7-pin LEMO connector for traditional power supply. It does not support models that require Constant Current Power (CCP or ICP ®)!