The 43BB-4 Low-noise Ear Simulator System is for acoustic low noise measurements on headphones, especially headphones with active noise cancellation. It is based on the IEC 60318-4 ear simulator standard. 43BB-4 Low-noise Ear Simulator System includes a GRAS 12HF 1-Channel Power Module for Low-noise Systems. 43BB is shown in the product picture. For more information about 43BB-4 read the product introduction below.
Technology
Introduction
The GRAS 43BB-4 is a low-noise, high-sensitive ear simulator system for measurements of sound pressure levels close to or below the threshold of human hearing.
It is identical to the 43BB Low-noise Ear Simulator System except that it uses an 8-degree angled adapter for the preamplifier with a built-in short 40 cm cable and therefore can be used in binaural setups inside test fixtures like the GRAS 45CB.
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43BB-4 is part of the GRAS 45CB-S4 Acoustic Test Fixture according to ANSI S12.42, low noise.
Read about the 43BB here.
Specifications
| Parameter |
Unit |
Value |
| Connector type |
– |
3 m 7-pin LEMO |
| Polarization / Connection |
– |
0 V / CCP |
| Theoretical dynamic range lower limit with GRAS preamplifier |
dB(A) |
10.5 |
| Theoretical dynamic range upper limit with GRAS preamplifier @ +28 V / ±14 V power supply |
dB |
113 |
| Coupler volume |
mm³ |
1260 @ 500 Hz |
| CE / RoHS compliant / WEEE registered |
– |
Yes / Yes / Yes |
The noise floor (solid line) is typically below the threshold of human hearing (dashed line).
The frequency response is very similar to the standard 60318-4 ear simulator up to 10 kHz
GRAS Sound & Vibration reserves the right to change specifications and accessories without notice.
