DPA APE40RS Acoustic Pressure Equalizer for d:dicate 4006A (40mm Ball)

Acoustic Pressure Equalizer, 40mm Ball for 4006A and 4006C

APE40RS Acoustic Pressure Equalizer, 40 mm Ball for 4006A and 4006C
The APE40 is a diameter40 mm sphere shaped Acoustic Pressure Equalizer, designed for use with the Reference Standard Microphone 4006A or the ST4006A stereo kit. For use with the compact 4006C, the microphone must be either hung or placed in the clip with an XLR connector plugged in.

It offers a more noticeable on-axis boost between 2 and 8 kHz, and stronger off-axis attenuation than the APE30. This gives a marked increase in the directivity of your recordings (at 4 kHz, the front-to-back sensitivity ratio is 8 dB), and decreases the effects of reverberation and off-axis sources.

When using APE40, you can modify the spectral characteristic of a source by simply altering the angle of incidence to give a frequency boost, a flat response or attenuation.

This accessory substitutes the former L40B, suitable for 4003, 4006, 4006-TL and their stereo kits. The L40B cannot be used with the modular series 4006A or 4006C and vice versa.

More on acoustic modification
The Acoustic Pressure Equalizers - APEs - are passive acoustic processors functioning as both spatial and spectral modifiers. They use diffractions on the surface to modify the sound field near the microphone diaphragm. This technique is only possible on omnidirectional pressure microphones.

Two primary changes occur:
1. An upper-midrange/high frequency boost (without changing the low end) due to the pressure build-up at certain frequencies depending on the element's size.
2. More directionality at higher frequencies (focus).

A presence (upper-midrange) lift is often desirable in rhythmical genres, to make a voice or an instrument cut through a mix or simply to make it more intelligible or well defined. For symphonic music, the frequency response of certain legendary vintage types of microphones can be obtained using one of the APEs. However, you will achieve a much higher degree of naturalness and detail when using a precision handcrafted 4006A.