Sensitivity, frequency response

Knowledge Base

SENSITIVITY

  • Sensitivity at 1 kHz at a load of 1 kΩ, according to IEC 60268-4
  • Logarithmic specification in dB relative to 1 V/Pa, or linear in mV/Pa
  • After a large round of measurements in 2018 with external partners, the values may differ from older values. The reason for this is the continuous material and electronic component changes of the microphones in the last years and decades.

SENSITIVITY

  • Sensitivity at 1 kHz at a load of 1 kΩ, according to IEC 60268-4
  • Logarithmic specification in dB relative to 1 V/Pa, or linear in mV/Pa
  • After a large round of measurements in 2018 with external partners, the values may differ from older values. The reason for this is the continuous material and electronic component changes of the microphones in the last years and decades.

Frequency response tolerance

For quality assurance purposes, Schoeps measures the frequency response and sensitivity of each capsule that we produce. Deviations are accepted only within narrow limits. For the sensitivity of a microphone capsule, i.e. the level at 1 kHz, we allow deviations of ±1 dB relative to the standard sensitivity specified on the Web site. In the frequency range between 200 and 6000 Hz, deviations of more than ca. 1 dB from the normalized 0° frequency response are not allowed. The off-axis curves of some microphone types are also measured and—depending on the microphone type—must adhere to various other strict limits.

Pairing of capsules

If microphone capsules are shipped as matched pairs, particularly strict criteria apply. We always look for the best pairs from a large batch of microphone capsules. In this way, we actually achieve an overall match in the entire mid-frequency range between 200 and 10000 Hz with deviations of less than 0.1 to 0.5 dB, depending on the microphone type. Especially the sensitivity, i.e. the level at 1 kHz, has to match exactly in order to achieve a perfect stereo image with a fixed, common gain setting at the preamplifier.