GRAS 40PM EQset™ is a short 20 kHz ¼″ pressure microphone with a dynamic range from 30 dB (A) to 120 dB SPL (<3% THD) and the same length (34 mm) as traditional production line microphones. Its fixed sensitivity, flat response curve across all frequencies, and high environmental stability make GRAS 40PM the ideal production line microphone. Learn more about the EQset Technology >>

GRAS 40PM with EQset is designed for use in production line environments, and it provides many benefits over traditional production line- or array-style microphones. Designed to be cost-effective, easy to use, resistant to errors, and environmentally stable, GRAS 40PM is the best production line microphone option on the market. Each GRAS 40PM microphone has a flat response curve and fixed sensitivity. The tolerance for individual microphone sensitivities is less than ±0.2 dB, and frequency-response variation is less than ±0.5 dB up to 10 kHz. And because GRAS 40PM is dimensionally identical to the traditional production line microphones, it can easily replace them in existing setups.

EQset microphones all have a uniformly fixed sensitivity and flat curve. This reduces measurement uncertainty and greatly simplifies microphone setup, monitoring, replacement, and corrections. EQset means that everything can happen quickly and easily without any individual microphone adjustments or corrections. The simplification of setup and other tasks saves both time in the setup itself and time in operator training. There is, however, one additional benefit that outshines the time savings: EQset almost completely eliminates the inherent risk of false passes on production lines or correction error for frequencies outside the calibrated frequency in R&D—common issues with other microphones in the market.