Rolls MA255 Manual de Usario
Rolls
batidora de mano
MA255
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MA255
20 + 20 watt
Mixer/Amplifi er
Connection guide
Salt Lake City, Utah
09/11
• RCA Inputs for all channels, and Channel 4 -
3.5mm stereo input on the front panel.
• Volume controls for each Channel
• Low noise, effi cient operation
• Small compact size
• Class D high effi ciency amp
The MA255 is a very compact 20 + 20 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
environments. Great for in ceiling and projector applications where
small size is needed along with class D low radiated heat loca-
tions.
W
W
W
WARNING:
ARNING:
ARNING:
ARNING:
WARNING:
THE MINIMUM SPEAKER IMPEDANCE IS 4
OHMS EACH.
IF YOU CONNECT AND USE THE MA255 WITH A LOW-
ER SPEAKER IMPEDANCE THAN LISTED ABOVE
YOU WILL DAMAGE THE UNIT AND POSSIBLY OTHER
EQUIPMENT THAT IS CONNECTED TO THE MA255.
CH 4
CH 1CH 2CH 3CH 4
LEVEL LE VEL LEVEL LEVEL
PS12
CLASS AMP
5 + 5 WATT M IX/AM P
LEFT RIGHT
MA251
3.5m m
STEREO
++
--
BOTH OU TPUTS MUST B E USED
PHANT OM
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 1CH 2CH 3CH 4
LEVEL LEVEL LEVEL LEVEL
LEFTRIGHT
INPUT
++
SPEAKER OUTPUTS
LINE
OUT
CH 2
MONO
INPUT
MUTE
0 10 0 10 0 10 0 10
--
CH 1
INPUT
CH 2
INPUT CH 3
INPUT CH4
INPUT
PS24
AMPMIX+
20 + 20 WATT MIX/AMP
MA255
MADE IN USA
www.rolls.com
SPECIFICATIONS:
Line Input Impedance: 10K Ohms
Power Output: 20 Watts X 2 (4 Ohms)
Voltage Gain: 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.
REAR PANEL
SPEAKER OUTPUT: Push terminals for speaker wire.
PS24: For connection to the power supply.
INPUTS: RCA line level inputs.
MUTE JACK: By shorting out the RCA jack labeled MUTE, the Speaker Outputs
will be muted.
FRONT PANEL
CHANNEL LEVEL: Adjusts the level of signal from the Line Input to the Line out
RCA's and Speaker outputs.
3.5mm JACK: For connection to an ipod, MP3 player or computer TRS Stereo
(left, right and ground) connection to channel 4.
CONNECTION / OPERATION
To operate the MA255, properly connect cords from the sources to be mixed (cassette
decks, CD players, etc.) into the channel inputs. Connect the speaker outputs to 4
Ohm or higher impedance speakers. Adjust the channel level controls for the desired
volume.
DESCRIPTION
NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWL-
EDGE OF AUDIO ELECTRONICS, BALANCED AND UNBALANCED CON-
NECTIONS, AND PROPER SIGNAL LEVEL SETTING.
INSPECTION / WARRANTY
1. Unpack and inspect the MA255 box and package.
If obvious physical damage is noticed, contact the carrier immediately to make a
damage claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please visit our web site at www.rolls.com and click on the Register Your War-
ranty Here button.
CH 4 CH 1CH 2CH 3CH 4
LEVEL LEVEL LEVEL LEVEL
INPUT
0 10 0 10 0 10 0 10
AMPMIX+
20 + 20 WATT MIX/AMP
MA255
MADE IN USA
www.rolls.com
CH 4
CH 1CH 2CH 3CH 4
LEVEL LEVEL LEVEL LEVEL
PS12
CLASS AMP
5 + 5 WATT MIX/ AMP
LEFT RIGHT
MA251
3.5mm
STEREO
++
--
BOTH OUTPU TS MUS T BE U SED
PHAN TOM
CH 1
INPUT
CH 2
INPUT
CH 3
INPUT
POWE R
LINE
OUT
ON - OFF
CH 2
MONO
INPUT
MUTE
R R R
L L L
LEFTRIGHT
+
+
SPEAKER OUTPUTS
LINE
OUT
CH 2
MONO
INPUT
MUTE - -
CH 1
INPUT
CH 2
INPUT
CH 3
INPUT CH4
INPUT
PS24
INTRODUCTION
Thank you for your purchase of the MA255. The MA255 is a four channel mixer/
amplifi er designed for Audio and Visual applications. Channel 1-4 have RCA
stereo inputs and channel 4 has a 3.5mm stereo input. The MA255 is intended
for professional applications. It has a FR4(V94-0) rated glass epoxy circuit board,
and a powder coated steel chassis. All inputs are stereo. Outputs for Speaker
and Line are true stereo.
CHANNEL DESCRIPTION
CH 1 INPUT: Stereo RCA jack for connection to a signal source such as a CD
player, cassette deck, tuner, etc.
CH 2 INPUTS: Stereo RCA and one mono RCA for connection to a signal source
such as a CD player, cassette deck, tuner, etc.. PLEASE NOTE WITH A MONO
INPUT AS WELL AS A STEREO INPUT, CHANNEL 2 AT CERTAIN IMPED-
ANCES ON THE STEREO INPUT YOU MAY EXPERIENCE CROSS TALK BE-
TWEEN THE LEFT AND RIGHT. THIS IS NORMAL OPERATION AND SHOULD
BE EXPECTED.
CH 3 INPUT: Stereo RCA jack for connection to a signal source such as a CD
player, cassette deck, tuner, etc.
CH4 INPUT: Stereo RCA jack for connection to a signal source such as a CD
player, cassette deck, tuner, etc. CH4 also has a front connection for a stereo
3.5mm(1/8” jack).
LINE OUT: Stereo RCA jacks for connection to a mixer or amplifi cation device.
MUTE
+B
+B
+B
MONO INPU T
LINE OUTS
VCC
V+
CH 4
CH 3
CH2
IN 12-24 VAC/VDC
2
3
1
J1
JAPDC
C3
1U
R9 100K
R6
4.7K
C7 1U
R26
10K
R24
1K
R14
10K
R15
10K
R19
10K
R20
10K
R12 100K
R2
10K
C6
47U
D2
1N4001
R5
22K C14
47U
C13
2200
R10
100
R8
18K
2
3
1
4
U1A
4560
6
5
7
8
U1B
4560
R1
10K
C8 120PF
C4 120PF
C10
47U
R7
4.7K
R13
100
1 3
2 P1A
P100K X2
1 3
2 P3A
P100K X2
1 3
2 P2A
P100K X2
4 6
5 P3B
P100K X2
4 6
5P2B
P100K X2
4 6
5 P1B
P100K X2
+ - - +
STEREO
R3 10K
R4 10K
R21
4.7K
D1
LDRR
PVCCL
1
SD2
MUTE
3
LIN
4
RIN
5
BYPASS
6
AGND
7
AGND
8
VCLAMP
9
PVCCR 10
PGNDR 11
ROUT 12
BSR 13
GAIN1
14
GAIN0
15
AVCC 16
AVCC 17
BSL 18
LOUT 19
PGNDL 20
U2
TPA3122D2N
C20
1K
C23
1K
C24
.1uF
C25
.1uF
C26
.1uF C27
.1uF
C21
.22uF
C18
.22uF
L1
47uH
L2
47uH
R27
4.7K
R28
4.7K
C19
.47uF
C22
.47uF
VCC VCC VCCVCC
SPEAKER OUT
VCC
1
Rolls Corporation
5968 S 350 W
Murray Utah84107
1
MA254.SCH A
5 APRIL 2010
Title
Size: Document Number:
Date:
Rev:
Sheet of
MA254 MIXER AMPLIFIER
Rb
VCC
R25
220K
Q3
2N3904
C15
10U
C16
1U
C17 1U
D3
1N4001
D5
1N4001
D4
1N4001
C12
2200
C11
2200
1
2
3
4
J6
PUSH TERMINAL
R16
1K
R18
10KR17
10K
J4
3.5STJK
C5
.047
C9
.047
R32
100K
R31
100K
CH 1
2
3
1
J5A
RCAX4 PC
5
6
4
J5B
RCAX4 PC
5
6
4
J2B
RCAX4 PC
5
6
4
J3B
RCAX4 PC
2
3
1
J2A
RCAX4 PC
2
3
1
J3A
RCAX4 PC
1 3
2 P4A
P100K X2
4 6
5 P4B
P100K X2
SCHEMATIC
Especificaciones del producto
| Marca: | Rolls |
| Categoría: | batidora de mano |
| Modelo: | MA255 |
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