PCB introduces the 1/2-inch pre-polarized low-noise microphone model 378A04
378A04 is a microphone system composed of a high-sensitivity microphone and a low-noise preamplifier, marking the industry's first pre-polarized IEC 61094-4 low-noise microphone and preamplifier system. It enables you to measure extremely low amplitudes, which was previously only possible with externally polarized solutions. The theoretical noise floor of this microphone system is 5.5 dBA, and it comes with all the advantages of pre-polarized systems. You only need a signal conditioner or data acquisition card that provides ICP (IEPE) power (note: requires 4mA), eliminating the need for additional external polarization equipment. This allows it to share amplifiers with other ICP sensors, significantly reducing setup costs and simplifying installation.
The 378A04 is currently used as a designated test microphone by Apple in the United States and by many acoustic processing manufacturers.
Product Features：
- Pre-polarized design (0V), eliminating the need for expensive external polarization equipment.
- Low noise level down to 5.5 dBA (theoretical value).
- Wide frequency range: (10 Hz-20 kHz).
- High sensitivity: 450 mV/Pa.
- Certified by A2LA, ILAC, and CE.
- Built-in TEDS 1451.1.
Application Areas：
- Computer hard drive testing
- Electric vehicle sound quality
- Cabin noise measurement
- Environmental noise monitoring
- Equipment noise source localization
- Sound power measurement
Routinelow-noise testing
