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Products - Precision Microphones
Mics  /   Mic Systems  /  Accessories  /  Simple Intensity™  /  SPL Calibrators
ACOusticCap™  /  ACOtronPreamp
  /   ACOustical Interface™  /  IEPE/IEPE Products
SLARM™ - ACOustAlarm™  /  "Extremely Random" Noise Generator

MICS - Detailed Specifications

Precision Measurements Require Precision MicrophonesTM

IEC61094-4 compliant

In this day of precision electronics, the accuracy of acoustic measurements is primarily determined by the input transducer (microphone). Repeatable measurements require improved stability over time and under all measurement conditions. ACO Pacific's "Alternative" Family is the answer.

Measurement Microphones

The "Alternative" Family of IEC61094-4 compliant measurement microphones are designed to meet stringent IEC and ANSI International standards. The Stainless Steel bodies, selected stainless and titanium diaphragm materials, and quartz and other "0" Tempco insulators assure excellent long-term and temperature stability. The flat, predictable Free Field and Pressure responses of these 1, 1/2, and 1/4 inch microphones is reflected in the individual "birth certificates" supplied with each microphone. Using a microphone is now a pleasure not a chore.

Frequency response to 120 kHz (-2 dB) (Model 7016), Noise floors below 10 dBA (Model 7022), maximum input to 175 dBSPL (3% THD) (7017) and Phase Matched Pairs (I & PM Series) are among the features offered by these microphones. The MK224 Electret (prepolarized) and 7052 are also available. Companion power supplies - the PS9200 series, and the companion 4000 series preamps round out the product line. These precision microphones are mechanically, acoustically, and electrically compatible with their more costly counterparts.

Over 38 years of manufacturing and design experience comes with every microphone and system. Competitive End-user and OEM pricing is available.

  Frequency Response: 8 Hz to 20 kHz
  Sensitivity: 50mV/Pa (-26dBV/Pa)
  Dynamic Range: 12dBA to 144dBSPL
  Diaphragm: Quartz Coated Nickel
  Temperature Coefficient: 0.01 dB/C
  Mounting Thread: 11.7mm 60UNS2

Click here to see specification chart


The Frequency Response chart shown above provides an indication of the typical responses of our standard IEC61094-4 compliant measurement microphones. The P curve is the actual pressure response as derived from testing with an Electrostatic Actuator. The F curve is the corrected Free Field Response curve. Extensive testing in Anechoic Chambers has established this Free Field Correction Factor. This procedure is standard through out the industry. Thus for Pressure response microphones - only one curve - the actual electrostatic actuator measurement - is provided.

Each ACO Pacific, Inc IEC61094-4 compliant Measurement Microphone is supplied with an individual "Birth Certificate". This certificate includes the Open Circuit Sensitivity at 250 Hz in dBV/Pa (dB relative to 1 V rms per Pascal) and also stated in mV/Pa. These values have been corrected to 760 mm/Hg. The capsule capacitance in pF is also listed, as are the actual test conditions. The frequency response chart supplied is derived from testing with an electrostatic acuator . Free Field curves are calculated from established Free Field Correction Factors and a Free Field Curve is plotted. Free Field Response curves are based on having the microphone grid in place on the microphone capsule.  7052E capsules are true Anechoic Free Field Responses.

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IEC61094-4 compliant Measurement Microphones - Prepolarized

Exceptional Microphones

7052E - 1/2 Inch Free Field Response Microphone
  Frequency Response: +/-2 dB 3 Hz to 20 kHz
  Sensitivity: -29 dBV/Pa  35 mV/Pa
  Dynamic Range: <20 dBA to >150 dBSPL
  Cartridge Capacitance: 18 pF
  Polarization Voltage: Prepolarized Back Electret
  Temperature Coefficient (-10 to +50C) : .01 dB/C
  Influence of Humidity: 55C/95% +/-0.1 dB
  Longterm Stability: >250 years/dB

Mechanical for 7052E:

   Height of Cartridge:w/grid 13 mm
w/o grid 12 mm
   Diameter of Cartridge: w/grid 13.2 mm
w/o grid 12.7 mm
   Grid Thread: 11.7 mm 60UNS2
   Preamp Thread 11.7 mm 60UNS2

Suggested Preamps



1 Inch Mics - 4022 (4012 Preamp + AD0122 Adaptor)
1/2 Inch Mics - 4012 Preamp - No adaptors
1/4 Inch Mics - 4016 (4012 Preamp + AD0016 Adaptor)
4212 CCLD Preamp
4052 OEM Preamp

Right Angle Preamp - 4012RA
Right Angle Preamp - 4212RA

Adaptors - Preamp

AD0122 - 1 Inch Mic to 4012 (1/2 inch preamp)
AD0016 - 1/4 Inch Mic to 4012 (1/2 inch preamp)

Adaptors - Calibrator (521)

QD7 - 1/4 Inch Mic Adaptor

Windscreens -

WS1 - 3 Inch Diameter
WS7 - 7 Inch Diameter

WS1-80T - 3 Inch Outdoor Windscreen
WS7-80T - 7 Inch Outdoor Windscreen

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