DPA 4021 User Manual download pdf (Page 3)

T E C H N I C AL DESC RI PT I O N

The cartridge

Types 4021, 4022, 4023, 4026, 4027 and 4028 are Cardioid

(Pressure gradient) microphones that use the same microphone

capsule as the standard microphones Types 4011, 4012, 4015 and

4016. The Compact Cardioid Microphones use a 19mm diameter

prepolarized pressure gradient condenser microphone cartridge.

Type 4021, 4022 and 4023 offer a first order cardioid pick-up pat-

tern, the Type 4026, 4027 and 4028 offer a wide cardioid pattern

(see Fig. 2 & 3).

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 microphone highly insensitive to

temperature influence and allows greater SPL handling before

clipping occurs.

Type 4021, 4022 and 4023 are designed to have a linear on-axis

response from 40Hz to 20kHz (±2dB) measured at 30cm dista n c e

(see Fig. 4). Type 4026, 4027 and 4028 are designed to have a

linear on-axis response from 40Hz (±2dB) to 20kHz (+3/-1dB) meas-

ured at 60cm distance (see Fig. 5) and are fur thermore intentionally

calibrated with a slight high-frequency soft boost.Great attention

has also been paid to the microphone’s off-axis perf o rmance during

the design process (see Fig. 4 & 5 ).

The diaphragm is protected from dust by an acoustically transparent

net behind the front protection grid and inside the back port of th e

c a rt r i d ge. For optimum stability the microphone cart r i d ge has

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

in the materials as well as the polarization voltage.

The preamplifier

The Compact Cardioid and Compact Wide Cardioid Microphones use

built-in ultra-small, thick-film preamplifiers with unity-gain, low noise

FET-amplifier technology. The thick-film technology enables the

microphone cartridge to be mounted on an exceptionally compact

microphone housing with the preamplifier mounted directly behind

the microphone cartridge. A circuit of passive components in the

standard 3-pin XLR connector adapts the P48 phantom powering,

separates the supply voltage from the audio signal and acts as an

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DPA 4021 User Manual Page 3