DPA 4012 Руководство пользователя - Страница 2

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TECHNICAL DESCRIPTION

The cartridge

Directional microphones Type 4011-TL, 4012, 4015-TL and 4016 use

a 19 mm diameter prepolarised pressure gradient condenser-micro-

phone cartridge. Type 4011-TL and 4012 offer a first order cardioid

pick-up pattern, the Type 4015-TL and 4016 offer a wide cardioid pat-

tern (see Fig. 1 & 2). The diaphragm is highly resistant to the most

aggressive kinds of humidity. The large spacing between the

diaphragm and the back plate in this cartridge makes the micro-

phone highly insensitive to temperature influence and allows the cap-

sule to handle greater sound pressure levels.

Type 4011-TL and 4012 are designed to have a linear on-axis response

from 40 Hz to 20 kHz (± 2dB) measured at 30 cm (see Fig. 3). Type

4015-TL and 4016 are designed to have a linear on-axis response from

40 Hz (±2 dB) to 20 kHz (+3/-1dB) measured at 60 cm (see Fig. 4) and

are furthermore intentionally calibrated with a slight high-frequency

soft boost.

Great attention has also been paid to the microphone's natural

sounding off-axis performance during the design process (see Fig. 3

& 4). The diaphragm is protected from dust by an acoustically trans-

parent net behind the front protection grid and inside the back port

of the cartridge. For optimum stability the microphone cartridge has

undergone a special pre-aging process, which stabilizes all tensions in

the materials as well as the polarisation voltage.

The preamplifiers

The 4011-TL and 4015-TL are 48 V phantom powered, whereas the

4012 and 4016 are powered with 130 V via the DPA Type HMA5000

high-voltage Microphone Amplifier. The 4011-TL and 4015-TL are

transformerless and impedance balanced and have a standard 3-pin

XLR-connector (see Fig. 5 for pin designation). They feature a 20 dB

attenuator push-switch built into the connector (see Fig. 6). When

the button is pushed in, the output is attenuated 20 dB. The attenu-

ation allows the microphones to be used for close-miking high SPL

sound sources without overloading the console input amplifier from

the output of the microphone. The 4012 and 4016 have a modified 4-

pin XLR-connector (see Fig. 7 for pin designation).