s i g n
. . . a
- L i
- S t
- I n
INTRODUCTION
Thank you for your purchase of the MX51s Mini-Mix II. The MX51s
is a four channel mixer designed for Audio and Visual applications.
Channels 1 has a microphone XLR input with switchable phantom
power. Channel 2 has 1/8” and RCA inputs. Channels 3 and 4 have
RCA jacks. The unit also features a 1/8” headphone output that
will drive up to 600 Ω headphones with full frequency response.
The MX51s is intended for professional applications. It has an FR4
glass epoxy circuit board, vinyl laminated steel chassis bottom and
a powder coated top. All inputs except CH 1 microphone are stereo.
All outputs are true stereo.
e r
C h a n n e l M M i X
DESCRIPTION
DC PWR: For connection to the ROLLS PS27 power supply.
OUT: Stereo RCA jacks for connection to a mixer or amplifi-
cation device.
CH 4 and CH 3 INPUT: Stereo RCA jacks for connection to a
signal source such as a CD player, cassette deck, tuner, etc.
CH 2 INPUTS: Stereo RCA and one 1/8” jacks (paralleled)
for connection to a signal
1 s M i M
12V DC
CH 2
INPUTS
OUTPUT
CH 4
INPUT
CH 3
INPUT
CH 1
INPUT
+
-
PHANTOM
POWER
source such as that men-
tioned for Channels 3 and
4, or to a source such as
a wireless microphone or
instrument.
CH 1 INPUT: XLR jack
for connection to a micro-
phone. Switchable jumper
STEREO LINE MIXER
MX51s
LINE/
HEADPHONE
OUTPUT
CH 4
LEVEL
CH 3
LEVEL
CH 2
LEVEL
CH 1
LEVEL
phantom power as labeled on unit.
LINE/HEADPHONE OUTPUT: 1/8” Stereo jack for connec-
tion to a mixer, amplifier or stereo headphones.
MX51s MINI MIX 2
-
For mixing a microphone XLR input with up to three
RCA input signals
CH 1 - 4 LEVEL: Adjusts the volume level of each channel.
- Four channels total
- Line / Headphone output level
- ROLLS PS27 AC adapter included
OPERATION
To operate the MX51s, properly connect cords from the
sources to be mixed (mics, cassette decks, CD players etc.)
into the channel inputs. Connect the outputs to an ampli-
fication device or sound system. Adjust the channel level
controls for the desired volume. For private listening, plug
stereo headphones into the LINE/HEADPHONE OUTPUT
The MX51s Mini Mix 2 is small four-channel mixer with individual
volume controls, and a headphone / line output. The unit has one
XLR input along with an 1/8” input and 3 sets of stereo RCA inputs.
It has enough gain and output level to connect to a power amplifier,
with either RCA or 1/8” jacks. The MX51 is powered by an included
ROLLS PS27 12 VDC adapter.
on the MX51s front.
SPECIFICATIONS
Input Impedance:
CH 1 Gain:
Phantom Power:
Ch2 Gain:
Ch 3 and 4 Gain:
Output:
S/N Ratio:
THD:
IMD(SMPTE):
Power:
10K Ω unbalanced each jack
32 dB XLR jack (highest gain)
for CH 1 microphone XLR
26 dB 1/8" and RCA
26 dB each RCA
1/8" stereo and stereo RCA
>90 dB
<.008%
SCHEMATIC
R10 R14
3.3K 3.3K
C10
1U
Q2
2N3904
Q1
2N3904
H1A H1B H1C
HD3 HD3 HD3
+V
P4
P100K
T1
R22
100K
PHANTOM
R17
100K
R21
10K
C8
10U
C4
CH 4
J5
XLR
3
+B
100K
R7
47U
XFMRAUDIO
C9
27PF
F
PC
+V
R14
1K
C6
1U
R4
10K
C3
47U
R20
100
6
5
J6
J4
3.5STJK
7
U1B
P3A
P100K X2
2
5
3.5STJK
LINE/HDPHONE
4560
+B
R5
10K
R3
1K
H2A
<.008%
ROLLS PS27 12 VDC adapter
1 lbs. (.45 Kg)
1
J3B
R6
MONO
HD3
H2B
P3B
P100K X2
CH 3
10K
4
6
2
3
RCAX4 PC
J2A
RCAX4 PC
HD3
H2C
1
3
STEREO
R8
10K
LINE OUTS
HD3
Weight:
Size:
R13 100K
P2A
P100K X2
2
5
RCAX4 PC
J3A
R9
10K
3" x 5" x 1.25" (8 x 13 x 3.2 cm)
C2 27PF
1
3
4560
C1
1U
CH 2
R16
100
2
C5
R11
10K
1
U1A
WARRANTY
P2B
P100K X2
3
47U
+B
RCAX4 PC
J2B
For information on the Rolls One Year Limited Warranty, and
to register this product, visit our website at www.rolls.com
10K
R10
CH1
4
P1A
P100K X2
2
5
6
R12
10K
P1B
P100K X2
D2
1N4001
R19
18K
+V
+B
Rolls Corporation
J1
2
5968
S
350
W
3
1
Murray Utah 84107
R18
22K
R15
4.7K
IN 9-15 VAC/VDC
C12
47U
C7
1000 UF
Title
M51S 4CH MIXER PLUS
Document Number:
D1
JAPDC
Size:
Rev:
A
LDRR
MX51S.SCH
Sheet
Rolls Corporation
Salt Lake City, UT
05/2008
FXa
Date:
9
NOVEMBER 2007
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of
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