Rolls Music Mixer MX51s User Guide

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 ampli-  
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, amplier 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-  
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  
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 amplier,  
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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