The L30B is a diameter30 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
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.