Brochure

AUDIO INTERFACES
Tel: [phone] Fax: [phone] Email: [e-mail] Internet: www.sonifex.co.uk
MICROPHONE AMPLIFIERS & LIMITERS
Redbox - Microphone Amplifiers & Limiters
RB-DMA2 Dual Digital Microphone Amplier
The RB-DMA2 consists of two independent
low-noise microphone pre-ampliers for
converting microphone level signals to a
digital AES/EBU or S/PDIF output. Individual
analogue balanced line level outputs are
also produced for use, for example, to feed
talkback systems. The unit can either be
used as two independent microphone
ampliers, or one mic input can be copied
to both channels of the digital output.
The microphone inputs are XLR-3 type and
are electronically balanced. The input gain
for each input can be adjusted individually
by a volume control on the front panel
enabling the use of dynamic and powered
microphones and each has a LED level
indicator. For each channel there are
independent switches to control a high pass
lter (low frequency roll-o at 125Hz) and
to provide phantom power at +48V to the
connected microphones.
The RB-DMA2 has AES/EBU, S/PDIF and TTL
word clock sync inputs and has the same
sync modes, bit depth selection, channel
status bit adjustment, front panel LED
synchronisation and calibration routine as
the RB-ADDA. Please refer to that product
for further information.
Audio Specication For RB-DMA2
Input Level: Max -25dBu, Min -62dBu to give FSD
Input 2kΩ nominal
Impedance:
Input Gain 37dB
Range:
Low 125Hz @ 6dB/octave
Frequency
Roll-o:
Signal To Noise: 130dB EIN
Dynamic >110dB
Range:
Distortion <0.01% THD + N absolute @ 1kHz
And Noise:
Phantom 48V
Power:
Connections
Microphone 2 x XLR 3 pin female (balanced)
Inputs:
Sync Inputs: 1 x AES/EBU XLR 3 pin female
(balanced)
1 x S/PDIF RCA phono socket,
1 x TTL BNC female
Analogue 2 x XLR 3 pin male (balanced)
Outputs:
Digital Outputs: 1 x AES/EBU XLR 3 pin male (balanced),
1 x S/PDIF RCA phono socket
Mains Input: Filtered IEC, switchable 110-120V,
or 220-240V, fused, 10W max
Fuse Rating: Anti-surge fuse 100mA 20 x 5mm
(230VAC)
Anti-surge fuse 250mA 20 x 5mm
(115VAC)
Equipment Type
RB-DMA2: Dual digital microphone amplier
Physical Specication
Dimensions 48cm (W) x 10.8cm (D) x 4.2cm (H) (1U)
(Raw): 19” (W) x 4.3” (D) x 1.7” (H) (1U)
Dimensions 53cm (W) x 20.5cm (D) x 6cm (H)
(Boxed): 21” (W) x 8” (D) x 2.4” (H)
Weight: Nett: 1.6kg Gross: 2.2kg
Nett: 3.5lbs Gross: 4.8lbs
The unit can either be used as
two independent microphone
ampliers, or one mic input can be
copied to both channels of the
digital output.
“
“