DPA 4006 Manuel de l'utilisateur - Page 5

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User's Manual

Technical Description

The Nearfield Grid

The Nearfield Grid DD0251 on the microphone cartridge is designed to have

a linear on-axis frequency response for near field applications (see Fig. 3 for

frequency responses measured with the Nearfield Grid). The grid can be

exchanged with the DD0297 Diffusefield Grid or the UA0777 Nose Cone.

The Diffusefield Grid

The Diffusefield Grid DD0297 is supplied as standard. It is designed for diffuse-

field recordings, or recordings in the far field. The grid gives a high-frequency

boost on-axis of 6dB around 15kHz (see Fig. 4) without adding noise to the

recording. This boost gives a linear diffuse-field (far field) response up to 15kHz.

The Nose Cone

The Nose Cone UA0777 is available as an optional accessory . As with the

Diffusefield Grid DD0297, the Nose Cone is simply screwed onto the micro-

phone cartridge in place of the Nearfield Grid DD0251. When fitted, the

Nose Cone gives the microphone a true omnidirectional response even at

high frequencies (see Fig. 7) and a linear diffuse-field response (see Fig. 5).

These qualities are useful at any distance for an even tonal balance of sound

arriving at all angles of incidence, e.g. room reverberation or several sound

sources placed around the microphone. The diaphragm is placed in a slot

behind the solid cone and sound waves only have access to the diaphragm

through the side of the Nose Cone. This way the Nose Cone prevents an

on-axis, high frequency sound pressure build-up on the microphone, which

is the reason for normal flat fronted omnidirectional microphones becoming

more and more directional for higher frequencies. There is however, a slight

high frequency boost on axis.