OPERATIONS MANUAL
DA-2M
DISTRIBUTION AMPLIFIER
UNPACKING
U.S. Audio has made every effort to ensure that your equipment is received in the same perfect
condition it was when it left the factory. Please inspect your product for any signs of damage during
shipping and report them to your dealer so that a claim can be made to the shipper. We recommend
that you save your packing material for use in the unlikely event that you need to return your
equipment for service.
Thank you for selecting the US Audio DA-2M.
a
which accepts either mic or line level inputs There are eight
electronically balanced XLR line level outputs with individual volume controls and clip indicators. The
audio performance is of the highest quality, making it an excellent value. Great care was taken in the
design so that the DA-2M can fulfill any distribution requirement, from broadcast audio feeds to
loudspeaker audio input distribution.
Inputs feature Neutrik combo 1/4” TRS/XLR connectors, mic/line level input switches, variable input
gain controls, low cut switches for reducing low frequency rumble or wind noise, four segment
headroom indicators and 48 V phantom power that is applied to the XLR in mic mode and turned off
when the input is used in line mode.
The front panel COMBINE switch converts the DA-2M from two 1X4 distribution amps to a 2x8
distribution amp with the two inputs combining to feed all eight outputs. This provides the capability of
having both a line and a mic input simultaneously.
A headphone circuit allows signal monitoring of each input in mono or listening to both input channels
in a stereo mode.
The DA-2M is
professional quality two channel
analog audio distribution amplifier
.
INTRODUCTION
SPECIFICATIONS
DA2M Product Specifications
Frequency Response
Line: +/- .5 dB 20-20 kHz
Mic: +/- .65 dB 20-20 kHz
Total Harmonic Distnoise
< .003 % at 1 kHz
Equivalent Input Noise
121 dB
Total Gain
74.7 dBV
Gain of Microphone/Line Switch
29 dBV
Gain of Input Trim
28.7 dBV
Gain of Channel Volume
17.0 dBV
Range of level pot
Trim –40.8 to +28.7 dBV
Channel: -61 to +17 dBV
Common Mode Rejection of Input
Line: -80.9 dB at 60 Hz, unity gain
Mic: -68 dB at 60 Hz, 40 dBV of gain
Maximum Input level
Line: +22 dBV
Mic: -7 dBV
Input Impedance
Line: 40 K Ohms
Mic: 1.5 K Ohms
Maximum output level
+27.6 dBV
Output drive power
+22 dBV into 600 Ohms
Output Impedance
100 Ohms
Minimum impedance of headphones
8 Ohms
Noise at unity gain
-92.4 dBV Line mode
Noise at 40 dBV of gain Mic mode
-80.4 dBV
Working signal to noise ratio (at 20 dBV
headroom)
Line: 114.6 dB at unity
Mic: 87.4 dB at 40 dBV of gain
Isolation between input channels
Line at unity:
112 dBV at 1 kHz
98 dBV at 20 kHz
Mic at 40 dBV of gain:
90 dBV at 1 kHz
75 dBV at 20 kHz
Clip LED threshold
LED
Headroom
Red
1 dBV
Yellow
12 dBV
Green 1 24 dBV
Green 2 36 dBV
Phantom Power
48 Volts DC
High pass filter
3 dB at 120 Hz
24 dB per octave slope
Output isolation between channels
102 dBV at 1 kHz
95 dBV at 20 kHz
Max Output of Headphones
+12 dBm at 47 Ohms
+7 dBm at 23.5 Ohms
Power consumption
Condition
Amps AC
Idle
.09
Full clean .195
Max.
.30
Size
1 RU
Internal Mains fuse
.5 amp slow blow type 3ag
AC dropout voltage
105 VAC 60 Hz
Power requirements
120 VAC 60 Hz
Internal jumpers for 230 VAC 50 operation 40 Watts
Max.
