DPA 4004 Panduan Pengguna - Halaman 3

Jelajahi secara online atau unduh pdf Panduan Pengguna untuk Mikrofon DPA 4004. DPA 4004 14 halaman. High spl omnidirectional microphones
Juga untuk DPA 4004: Panduan Pengguna (7 halaman)

Halaman Cetak

User's Manual

Technical Description

The cartridge

Types 4004 and 4007 are omnidirectional (pressure) microphones which

use a 12mm diameter prepolarized condenser cartridge. The diaphragm is a

nickel foil which has been coated with an ultra-thin polymer layer for

optimum corrosion resistance. The microphone housing is of German silver,

an alloy with a high content of nickel to match the stable thermal qualities

of the diaphragm. The self noise of the cartridge is typical 24dB(A) re. 20µPa

and the nominal sensitivity of the Types 4004 and 4007 are 10mV/Pa and

2.5mV/Pa respectively. Due to the size of the cartridge it can handle

extremely high SPLs, has an extended linear frequency response up to

40kHz and a high degree of omnidirectionality, even for higher frequencies.

For optimum stability the microphone cartridges have undergone a special

pre-aging process which releases all tensions in the materials and stabilizes

the polarization voltage.

The preamplifier

Types 4004 and 4007 are acoustically identical, but differ in their

preamplifier powering system. The 4004 is powered with 130V via the

HMA4000 Two-Channel High-Voltage Microphone Amplifier and has a

modified 3-pin XLR-connector (see Fig. 1 for pin designation). This special

powering system enables the microphone preamplifier to handle

approximately 10dB higher SPL than similar microphone types powered

through conventional P48 systems (4004: 168dB SPL peak and 4007: 155dB

SPL peak). Furthermore, the 4004 together with the HMA4000 is a totally

tranformerless system and therefore has an extended low-frequency

handling capability (10Hz to 40kHz ± 2dB). The 4007 is powered via a

standard P48 system and is equipped with a high quality audio transformer

and a standard 3-pin XLR-connector (see Fig. 2 for pin designation). Types

4004 and 4007 use state of the art low-noise preamplifier technology and

are driven with unity gain.