www.ctpsystems.co.uk
Tel44 (0)1580 891114
B-MA2
Dual Low-Noise Microphone
Preamplifier Beltpack
The B-MA2 is a compact, battery-powered unit containing two broadcast-quality,
variable-gain microphone preamplifiers. Level metering and setup are via a bright,
crisp OLED display and several configurable options allow tailoring of the unit to a
wide variety of broadcast applications.
Audio I/O
Standard 3-pin XLR connectors (pin 1 = ground, pin 2 = phase/hot,
pin 3 = antiphase/cold) are provided for all audio inputs and outputs.
The outputs are electronically balanced. If an unbalanced output is required then use
pin 2 as ‘hot’ and pin 1 as ‘cold. Do not short either pin 2 or pin 3 to pin 1 as this will
considerably reduce the life of the battery.
Power
The unit requires either a PP3/6F22-size 9V battery (alkaline types strongly
recommended) or an external power supply of nominally 12VDC at 100mA. DC input
is via a 2.1mm 'barrel' connector (centre pin positive, acceptable range 9-16VDC)
compatible with both standard plugs and Cliff twist-locking parts when extra security
is required.
Display
During normal operation, the OLED display shows the status of the battery and two
pseudo-PPM characteristic bargraph level meters indicating the output level on each
channel. When the battery indicator is empty, the battery should be changed as a
matter of urgency.
