MA251
5 + 5 watt
Mixer/Amplifi er
Connection guide
Salt Lake City, Utah
11/09
• RCA Inputs, XLR Mic with Phantom Power
• Volume controls for each Channel
• Low noise, effi cient operation
• Small compact size
• Class D high effi ciency amp
The MA251 is a very compact 5 + 5 watt high effi ciency amp with
a four channel stereo mixer built in. Left and Right stereo speaker
outputs. The unit is perfect for small speakers in small environ-
ments. Great for in ceiling and projector applications where small
size is needed along with class D low radiated heat locations.
WARNING:
WARNING:
THE MINIMUM SPEAKER IMPEDANCE IS 4
OHMS EACH.
IF YOU CONNECT AND USE THE MA251 WITH A LOW-
ER SPEAKER IMPEDANCE THAN LISTED ABOVE
YOU WILL DAMAGE THE UNIT AND POSSIBLY OTHER
EQUIPMENT THAT IS CONNECTED TO THE MA251.
CH 4
CH 1
CH 2
CH 3
CH 4
LEVEL
LEVEL
LEVEL
LEVEL
PS12
CLASS AMP
5 + 5 WATT MIX/AMP
LEFT
RIGHT
MA251
3.5mm
STEREO
+
+
-
-
BOTH OUTPUTS MUST BE USED
PHANTOM
CH 1
INPUT
CH 2
INPUT
CH 3
INPUT
POWER
LINE
OUT
ON - OFF
CH 2
MONO
INPUT
MUTE
R
R
R
L
L
L
CH 4
CH 1
CH 2
CH 3
CH 4
LEVEL
LEVEL
LEVEL
LEVEL
PS12
LEFT
RIGHT
MA251
INPUT
+
+
SPEAKER OUTPUTS
PHANTOM
CH 1
INPUT
CH 2
INPUT
CH 3
INPUT
POWER
LINE
OUT
OFF - ON
CH 2
MONO
INPUT
MUTE
MADE IN USA
0
10
0
10
0
10
0
10
www.rolls.com
-
-
CLASS AMP
5 + 5 WATT MIX/AMP
75889 02510
6
1
SPECIFICATIONS:
Line Input Impedance:
10K Ohms Line
600
Ohms
Mic.
Power Output:
5 Watts X 2 (4 Ohms)
Voltage Gain:
55 dB Mic
30
dB
Line
Maximum Supply Voltage:
24 VDC
THD:
.05%
typical
EIN:
3
mV
Effi
ciency:
85%
Input Sensitivity:
28 mV
Bandwidth:
20Hz - 25 kHz +/- 3dB
+Size:
6.75" x 3.5" x 1.5"
Weight:
1
lb.
