DPA Microphone HMA4000 User's Manual

Two-Channel Hi-Voltage
Microphone Amplifier

Type HMA4000

User’s Manual

Contents

Two-Channel Hi-Voltage Microphone Amplifier
Type HMA4000

Technical Description . . . . . . . . . . . . . . . . . . . . Page 3

Full Specifications. . . . . . . . . . . . . . . . . . . . . . . Page 7

Recommended Settings . . . . . . . . . . . . . . . . . . . Page 9

Changing the Main Fuse on HMA4000 . . . . . . Page 11

Care of HMA4000 . . . . . . . . . . . . . . . . . . . . . . . Page 12

Service and Repair . . . . . . . . . . . . . . . . . . . . . Page 13

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

CE Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . Page 13

User’s Manual

The DPA Microphones High-Voltage Microphones Types 4003, 4004 and
4012 are powered via the Two-Channel High-Voltage Microphone Amplifier
HMA4000, which supplies 130V to their build-in preamplifiers giving the
microphones excellent SPL handling capability. But the HMA4000 is not only
a power supply unit, it is also a microphone amplifier with outstanding
specifications:

The Microphone Amplifier

The HMA4000 uses state-of-the-art, low-noise operational amplifiers from
Analog Devices ‚ in the input stages. Each channel input features
independently switchable amplification or attenuation by +20 dB; 0 dB
or -20 dB corresponding to a maximum input voltage of 1,6 V; 16 V or
160 V peak. The dynamic ranges in the three attenuator settings are:
126 dB(A)THD=0,5% in setting +20 dB; 134 dB(A)THD=0,5% in setting

-20 dB and 140 dB(A)THD=0,5% in setting 0 dB. The HMA4000 is
completely transformerless, which gives the microphone amplifier an
excellent frequency range from 10 Hz to 200 kHz (-1 dB). Furthermore,
there is only one capacitor (a high quality polycarbonate condenser) in the
signal path in the HMA4000. The HMA4000 has a channel separation better
than -90 dB measured in worst case with the attenuator setting.
Featuring both electronically balanced and single ended line-level outputs,
the HMA4000’s impedance converters can drive up to 300m of cable.
Both input channels are single ended and it is recommended to use DPA
Microphone cables such as DAO0130 to keep noise rejection at its optimum.

3

Technical Description

User’s Manual

Absolute phase

During the design process attention has been paid to the absolute phase of
the system. Positive going voltage at pin 4 on the modified 6 pin female XLR
input socket will produce positive-going voltage at pin 2 on the standard 3-pin
male XLR output socket. (Pin 1: Ground; Pin 2: Signal +; Pin 3: Signal return.
See Fig. 1 and Fig 2 for pin designation of the input and output sockets).

Fig. 1. External view of the output

socket of the HMA4000.

4

Technical Description

User’s Manual