Close Miking - Zieaz LCA1 Instruction Manual

Close Miking

Example 3: "Close Miking"; Placing the microphone at about 5-10 cm from the
instrument allows good separation form other instruments, that also are close to the
microphone. In this case a "Close Miking" setup where the microphone is placed at a
distance of 6cm from a snare drums top skin. The "Set Gain to:" is -9.26dB, so
enabling a -10dB Pad switch on the preamp (if available) and 0dB Gain is a good
setting.
Importance to Pad/Gain level in the analogue domain: Since the "Max dB at 0cm" is
around 129dB, the peak voltage at peak sound pressure in the LCA1 microphone will
reach about +5,2 dBu (1,4 Volts RMS ), so when connected to a -4dBu (0,49 Volt RMS)
full-scale preamp, the signal from the microphone needs to be reduced before the
gain stage in the preamp to prevent distortion. The estimated signal reduction
needed can be calculated as following: 1,4 Volt / 0,49 Volt = 2,86 times reduction =
minus 9dB ~ so a -10dB Pad is sufficient.
16 of 25 v1.0 January. 2022