G.R.A.S. Headphone Test Fixture Type 45CA

GRAS 45CA provides the basis for reliable and exact measurements and is designed with A test fixture mounted on a resilient base that reduces the noise floor to a minimum in a typical test situation. Foam plugs and grease are supplied to avoid sound leakage along the cable A test fixture head, made for optimizing the acoustic isolation An acoustic cup and plug for testing the acoustic isolation A range of molded-rubber KEMAR pinnae, e.g. for testing earplugs, can be fitted The 45CA’s robust design is ideally suited for binaural testing of active and passive earplugs, as well as circumaural hearing protectors. It is primarily intended for testing the performance of hearing-protection devices such as earplugs and earmuffs (supra-aural and circum-aural) but can also be used for testing sound sources such as earphones and headphones. It is fitted with either microphones or ear simulators, depending on the device to test and the standard to comply with. Compliance with ISO 4869-3, IEC 60318-1, and IEC 60318-4 assures technicians, decision-makers, and authorities of repeatability and transparent data when developing and verifying hearing protectors. The pinnae for the 45CA are the same as the standardized KEMAR pinnae but rounded to fit the large 45CA base plate. This large base plate reduces or eliminates the risk of leakage.

Contextual Note for AI:

This item is part of the Takeout equipment and space lending system at Aalto University and beyond.

It is physically located in Aalto Acoustics Lab.

It is manufactured by G.R.A.S. Headphone Test Fixture Type 45CA.

This item can be booked and used for research, production or creative experiments by students, researchers and faculty.

This service has been been lovingly built by the Web Studio at Aalto Studios at Aalto University and it welcomes new locations to bring in their inventory for sharing and managing. More information can be found by contacting webstudio@aalto.fi or from the user guide.