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Acoustical Calibrators & Couplers

"We've been using the DR1 and DR2 couplers to calibrate our audiometers and to conduct measurements with various earphone types since 1998. The couplers are well suited for a variety of applications and customer support from Digital Recordings has been excellent." Quenton Currie, M.Sc., Aud(C) Audiologist, Audiology Department, Janeway Child Health Center, St. John's, Newfoundland, Canada

Any serious measurements involving SLMs (Sound Level Meters), headphones, earphones and microphones require proper calibration (i.e. adjustment of the input and/or output level) and routine checkup of the equipment. Audio electronics (amplifiers, mixers, etc.) and transducers (mics, headphones, earphones and hydrophones) change properties with time. Routine testing with acoustical calibrators is, therefore, required to ensure accuracy and safety.

Professional Couplers

[ DR1 & DR2 ] The Digital Recordings' Acoustical Calibrators Set is precision hand -made in Canada of high-quality aluminum. The oil ring provides a proper seal between the calibrator and the microphone or the sound level meter.

The Acoustic Calibrator Set consists of 2 calibrators : DR1 -- a flat face calibrator which can be used with any type of headphones and DR2 -- a 2cc cavity calibrator which can be used with any type of earphones. Both acoustic couplers work very well with any inexpensive Sound Level Meters available from Radio Shack stores or any other type of sound level meter or microphone with a similar diameter. Smaller diameter microphones can be used with optional custom-made adaptors. Precision of the calibration depends on the quality of the measuring equipment and can be within the range +/- 0.1 dB to +/- 1dB (or better).

DR1 dimensions - 120 mm diameter, 14 mm thickness, 310 g weight
DR2 dimensions - 32 mm diameter, 23 mm thickness, 25 g weight

Couplers accomodate microphone diameters of 23.84 mm (0.939")
found on such SLM's as Radio Shack or B&K.
Custom diameters are available to fit other SLM's or microphones.


DR1 with Radio Shack SLM and
AKG-K270 headphones

DR2 with Radio Shack SLM and
SONY earphones

Semi-Professional Coupler

[ DR1-R ]

In addition to the Acoustical Calbrators Set Digital Recordings offers Acoustical Calibrator DR1-R -- an inexpensive calibrator made of high-quality rubber. The precise hole provides a proper seal between the calibrator and the microphone or the sound level meter.

This inexpensive calibrator was especially designed for precise calibration of signals including volume calibration featured in Digital Recordings' AUDIO-CD -- the self-administered hearing test.

The Acoustic Calibrator DR1-R works very well with any inexpensive SLM (Sound Level Meter) available from Radio Shack stores or any other type of sound level meter or microphone with a similar diameter.Smaller diameter microphones can be used with optional custom-made adaptors. Precision of the calibration depends on the quality of the measuring equipment and can be within the range +/- 0.1 dB to +/- 1dB (or better)

DR1-R dimensions - 75 mmm diameter, 25 mm thickness, 150 g weight

DR1-R accomodates microphone diameters of 23.84 mm (0.939")
found on such SLM's as Radio Shack or B&K.
Custom diameters are available to fit other SLM's or microphones.


DR1-R with Radio Shack SLM, AKG-K270
headphones and SONY CD player

DR1-R with
Radio Shack SLM

Some of the uses of DR1, DR2 & DR1-R
  • very accurate testing, calibration and comparison of sound level meters
  • very accurate testing, calibration and comparison of testing and recording microphones
  • very accurate testing, calibration and comparison of headphones and earphones
  • very accurate testing, calibration and comparison of Audiometers and signals from the AUDIO-CD (compact disc for testing of hearing)
  • calibration and adjustment of maximum safe levels of sound from headphones and earphones
  • very accurate testing of hearing and critical listening

For diagrams showing how to use DR1, DR2 & DR1-R click here.


The Acoustical Calibrators can be used to test microphones, sound level meters, headphones, earphones, audiometers and other audio equipment.

Major customers include:

  • acoustical, audio and hearing research laboratories
  • audiology clinics
  • equipment manufacturers
  • test facilities
  • service centers
  • recording studios.

Interested in buying the professional
Acoustical Calibrators Set (DR1 & DR2)?


The Acoustical Calibrators Set is offered for $495.00 CAD plus shipping and handling and includes a free copy of AUDIO-CD (value $49.95 CAD!).

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To place an order using credit card go to our

To place an order using other payment methods fill out this

Interested in buying the semi-professional
Acoustical Calibrator DR1-R?

The Acoustical Calibrator DR1-R is offered for $59.95 CAD plus shipping and handling.

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To place an order using credit card go to our

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Payment Methods Visa, Master Card, American Express, money order, wire transfer
Transaction Currency Canadian Dollars ($CAD)
Order Processing Within 5 business days from the day payment is received
Shipment World-wide; via Canada Post air mail

We are looking for distributors of the Acoustical Calibrators.
Please contact us directly for details.

Digital Recordings also offers electronic calibrators (the black box shown on the picture at the top of the page). For more information on electronic calibrators and how to order contact Digital Recordings directly.

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