Rolls MiniMixII MX51s Manual, Specifications

MX51s 4-Channel Mixer
Rolls Corporation
Salt Lake City, UT
05/2008
- Install
- Studio
- Live
... anywhere you need to mix up to four line 
signals to a mono output.
SCHEMATIC
MX51s MiniMix II
MX51s MINI MIX 2
- 
For mixing a microphone XLR input with up to three      
  RCA input signals
- Four  channels total
- Line / Headphone output level
- ROLLS PS27 AC adapter included
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 amplifi er, 
with either RCA or 1/8” jacks. The MX51 is powered by an included 
ROLLS PS27 12 VDC adapter.
SPECIFICATIONS
Input Impedance:   10K Ω unbalanced each jack
CH 1 Gain:     32 dB XLR jack (highest gain)
Phantom Power:            for CH 1 microphone XLR 
Ch2 Gain:    26 dB 1/8" and RCA
Ch 3 and 4 Gain:  26 dB each RCA
Output:     1/8" stereo and stereo RCA
S/N Ratio:    >90 dB
THD:   <.008%
IMD(SMPTE):   <.008%
Power:      ROLLS PS27 12 VDC adapter
Weight:     1 lbs. (.45 Kg)
Size:      3" x 5" x 1.25"  (8 x 13 x 3.2 cm)
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.
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 
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 
phantom power as labeled on unit.
LINE/HEADPHONE OUTPUT: 1/8” Stereo jack for connec-
tion to a mixer, amplifi er or stereo headphones.
CH 1 - 4 LEVEL: Adjusts the volume level of each channel.
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-
fi cation device or sound system. Adjust the channel level 
controls for the desired volume. For private listening, plug 
stereo headphones into the LINE/HEADPHONE OUTPUT 
on the MX51s front.
WARRANTY
For information on the Rolls One Year Limited Warranty, and 
to register this product, visit our website at www.rolls.com
MX51s
STEREO LINE MIXER
PHANTOM
CH 1
INPUT
CH 2
INPUTS
CH 3
INPUT
CH 4
INPUT
OUTPUT
CH 1CH 2CH 3
CH 4
LEVEL
LEVEL
LEVEL
LEVEL
LINE/
HEADPHONE
OUTPUT
+
-
12V DC
POWER
1
Rolls Corporation
5968 S 350 W
Murray Utah 84107
1
MX51S.SCH
A
9 NOVEMBER 2007
Title
Size: Document Number:
Date:
Rev:
Sheet of
M51S 4CH MIXER PLUS
FXa
+B
+B
+B
LINE/HDPHONE
LINE OUTS
+V
+V
+V
CH 4
CH 3
CH 2
CH1
IN 9-15 VAC/VDC
P4
P100K
1
2
3
J2A
RCAX4 PC
2
3
1
J1
JAPDC
C6
1U
R3
1K
R7
100K
R4
10K
C1
1U
4
5
6
J3B
RCAX4 PC
R6
10K
R8
10K
1
2
3
J3A
RCAX4 PC
R9
10K
R11
10K
4
5
6
J2B
RCAX4 PC
R10
10K
R12
10K
R13 100K
R14
3.3K
C3
47U
D2
1N4001
R19
18K
R18
22K
C12
47U
C7
1000 UF
R20
100
R14
1K
2
3
1
4
U1A
4560
6
5
7
8
U1B
4560
R10
3.3K
C2 27PF
C9
27PF
1 2
3
J5
XLR F PC
J4
3.5STJK
J6
3.5STJK
C5
47U
R5
10K
R16
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
5
P2B
P100K X2
4 6
5
P1B
P100K X2
T1
XFMRAUDIO
1
H1A
HD3
2
H1B
HD3
3
H1C
HD3
R17
100K
Q1
2N3904
C4
47U
1
H2A
HD3
2
H2B
HD3
3
H2C
HD3
MONO
STEREO
PHANTOM
C8
10U
C10
1U
R21
10K
R22
100K
Q2
2N3904
+B
R15
4.7K
D1
LDRR

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