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.