GRAS 45CC Headphone Test Fixture

The GRAS 45CC Headphone Test Fixture is for dual-channel testing of headphones and headsets and is built on our vast experience in the field. With a focus on multiple configuration options and accurate, reproducable and repeatable test results, the test fixture can easily be adapted to many different headphone/headset designs and sizes.

Main features

• Dual-channel testing of headphones and headsets, from 3.15 Hz to 70 kHz
• Realistic human-like pinna for testing in-ear and insert earphones
• Multiple configuration options: microphones, IEC 60318-1 and IEC 60318-4 ear simulators, and human-like pinnae—with or without the optional mouth simulator
• Distance between ears adjustable from 130 to 170 mm
• Headband holder height adjustable from 75 to 135 mm
• Reproducible and repeatable positioning of DUT using 45CC’s unique positioning guides
• High-quality measurement microphones
• Expand testing to headsets with the optional ITU-T Rec. P51 mouth simulator

All adjustments to headband position and height, as well as the distance between the ear plates, can be done quickly and accurately.

Precise scales make it easy to document all settings accurately, be it the headband position, the width between ears, or the position of the positioning guide. This makes is easy to set up other 45CCs accross multiple test stations as duplicates of the original setup used in specifying testing.

Once the test fixture has been adjusted to fit a certain headphone, the design of headband holder, ear plates and the unique positioning system ensure that when testing identical headphones you will get the same positioning and fit from one test to the next. Therefore repeatability in a production line testing environment will be second to none with the 45CC. This makes the 45CC the unrivaled choice for demanding Quality Control and Production Line applications, but can also be used for Research and Development.

The Configurations

For your convenience, we have made 45CC available in a number of configurations to suit specific testing needs. Each configuration comes with the mounting needed to incorporate the optional mouth simulator for testing headsets.

The configurations are:

• Basic 2-channel acoustic headphone and headset test fixture for basic tests where no acoustic loading is needed

Flush-mounted ½″ microphones: Excellent for scenarios such as quick turnaround prototype refinement

45CC-1 with Externally Polarized ½″ Microphones
45CC-2 with Prepolarized ½″ Microphones

GRAS 45CC test fixtures configured with ½″ externally polarized or prepolarized microphones that are primarily intended as tools for Quality Control and Production Line testing of headphones.

• Basic 2-channel acoustic headphone and headset test fixture for basic tests where no acoustic loading is needed but where frequencies above 20 kHz (up to 70 kHz) are also of interest

Flush-mounted ¼″ microphones: Ideal for quick prototype refinement of hi-res on- or around-ear headphones.

45CC-9 with Externally Polarized ¼″ Microphones
45CC-10 with Prepolarized ¼″ Microphones

GRAS 45CC Headphone Test Fixture configured with ¼″ externally polarized or prepolarized microphones extends the frequency range to 70 kHz for high-frequency testing.

• 2-channel acoustic headphone and headset test fixture with artificial ear simulators for test scenarios that require acoustic loading and adherence with IEC 60318-1

Ear simulators and ½″ microphones: Designed for testing on-ear and around-ear headphones in environments that require a highly durable ear simulator

45CC-3 with IEC 60318-1 Ear Simulators and Ext. Polarized ½″ Microphones
45CC-4 with IEC 60318-1 Ear Simulators and Prepolarized ½″ Microphones

GRAS 45CC Headphone Test Fixture configurations with IEC60318-1 ear simulators and ½″ externally polarized or prepolarized microphones are primarily intended as tools for Quality Control, Production Engineering and Production Line headphone testing. When testing according to IEC 60318-1 the acoustical load from an ear simulator is required.

• Human-like 2-channel acoustic headphone and headset test fixture with ear simulators and realistic pinnae for test scenarios that require acoustic loading and adherence with IEC60318-4

Pinnae and ear simulators: Designed for testing any headphone type, including in-ear and inserts, requiring realistic human acoustic loading and ear geometry

45CC-14 with IEC 60318-4 Ear Simulators, Pinnae and Ext. Polarized Microphones
45CC-15 with IEC 60318-4 Ear Simulators, Pinnae and Prepolarized Microphones

GRAS 45CC Headphone Test Fixture configurations with IEC60318-4 ear simulators and realistic pinnae with accuate ear geometry are available with externally polarized or prepolarized microphones. They are primarily intended as tools for Quality Control and Production Engineering when testing according to IEC 60318-4 the acoustical load from an ear simulator is required. These configurations can be used to test any style of headphone or headset (with the optional GRAS 44AA or 44AB Mouth Simulator), including in-ear and insert earphones.

• Human-like high-frequency 2-channel acoustic headphone and headset test fixture with ear simulators and realistic pinnae for test scenarios that require acoustic loading and adherence with IEC60318-4 at higher frequencies

Pinnae and ear simulators: Designed for high-frequency testing of any headphone type, including in-ear and inserts, requiring realistic human acoustic loading and ear geometry

45CC-16 with High-frequency IEC 60318-4 Ear Simulators, Pinnae and Ext. Polarized Microphones
45CC-17 with High-frequency IEC 60318-4 Ear Simulators, Pinnae and Prepolarized Microphones

GRAS 45CC Headphone Test Fixture configurations with IEC60318-4 ear simulators and realistic pinnae with accuate ear geometry are available with externally polarized or prepolarized microphones. They are primarily intended as tools for Quality Control and Production Engineering when testing according to IEC 60318-4 the acoustical load from an ear simulator is required. These configurations can be used to test any style of headphone or headset (with the optional GRAS 44AA or 44AB Mouth Simulator), including in-ear and insert earphones.

Warranty

GRAS offers a five-year warranty against defective materials and workmanship.

Service

If you accidentally damage the diaphragm on a GRAS microphone, we can—in most cases—replace it at a very reasonable cost and with short turn-around time. This not only protects your investment but also pleases your quality assurance department because you don’t have to worry about new serial numbers, etc.

Before leaving the factory, all GRAS microphones are calibrated in a controlled laboratory environment using traceable calibration equipment.

Calibration

Depending on the use, measurement environment, and internal quality control programs, we recommend recalibrating the microphone at least once a year.