High SPL handling Microphones

We now have available new Girardin fixed-mode High-SPL microphones.  These are intended for special purpose higher level measurement needs.  For most users, these mics should act as second mics, not as the primary mic for typical measurement purposes.

These microphones include modified capsule with increased local feedback (addes Rs-6.2k ohms) in the FET buffer circuitry for approximately 12dB higher SPL handling.  These mics operate with similarly reduced sensitivity -for this reason, the High-SPL mics are NOT RECOMMENDED as the only microphone in a measuring system for typical measurements -- THE HIGH SPL MICS MAY NOT BE USABLE for many measurements made using the built-in EASY SCRIPTS (LAUD) or Scripts (PRAXIS),.

 

Bias Source

Typical Standard Mic Sensitivity

Standard Mic Max level
(<3%THD, midband sinewave
)

Typical Hi-SPL Mic Sensitivity

Hi-SPL Mic Max Level
(<3% THD, midband sinewave)






PRAXIS AudPod,
or Turtle Beach Fiji or Pinnacle Mic jack

9.3 mV/Pa
(separately determined for each microphone)

approx
128 dBSPL

2mV/Pa
(separately determined for each microphone)

140dB SPL
min






Liberty Mic/Probe Preamp
(required for use with PSA or ECHO type cards)

6.3mV/Pa

approx
116 dBSPL

1.4mV/Pa

approx
128 dBSPL