Rolls MA251 Connection Manual

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.

SPECIFICATIONS:

Line Input Impedance:
Power Output:
Voltage Gain:
Maximum Supply Voltage:
THD:
EIN:
Effi ciency:
Input Sensitivity:
Bandwidth:
+Size:
Weight:
Salt Lake City, Utah
11/09
10K Ohms Line
600 Ohms Mic.
5 Watts X 2 (4 Ohms)
55 dB Mic
30 dB Line
24 VDC
.05% typical
3 mV
85%
28 mV
20Hz - 25 kHz +/- 3dB
6.75" x 3.5" x 1.5"
1 lb.
75889 02510
6
Mixer/Amplifi er
MADE IN USA
www.rolls.com
CLASS AMP
5 + 5 WATT MIX/AMP
LEVEL
1 CH
POWER
PHANTOM
OFF - ON
INPUT
1 CH
OFF - ON
CH 1
PHANTOM
INPUT
POWER
• 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.
1
MA251
5 + 5 watt
MA251
0 10 0 10
CH 4 CH 3
CH 4
LEVEL LEVEL
INPUT
LEVEL LEVEL LEVEL STEREO
2 CH 3 CH 4 CH 3.5mm
4 CH
INPUT OUT INPUT
INPUT
2 CH 3 CH LINE MONO
L L L 2 CH
USED BE
RIGHT
R R R MUTE
+
CH 2
MONO
SPEAKER OUTPUTS
INPUT
-
+
CH 2 LINE MUTE
CH 3
RIGHT
INPUT OUT
INPUT
Connection guide
0 10 0 10
CH 2 CH 1
LEVEL LEVEL
MIX/AMP WATT 5 + 5
AMP CLASS
MA251
MUST OUTPUTS BOTH
LEFT
- - +
PS12
PS12
-
+
LEFT