The L30B is a Ø30 mm sphere shaped Acoustic Pressure Equaliser, designed for use with the Standard Microphone 4003 and 4006 or the A-B Stereo Kits 3503 and 3506.
It gives a mild modification of your microphone's on-axis and off-axis frequency responses, and a slight change in the direction-to-reverberation ratio.
This will give your recordings greater presence, nearness and clarity on-axis (especially around 4 kHz).
An on-axis boost, between 2 and 8 kHz, and high-frequency roll-off off-axis, will sometimes help you capture the subtle audible details of both musical instruments and voices.
Detailed and natural reproduction with high sensitivity and low noise-floor – excellent for concert halls and spot miking for acoustical instruments.
Detailed and natural reproduction with high sensitivity and low noise-floor: 4006 is one of the most sought after studio mics – and the one that gives you the most value for your money.