Owners Manual
Rolls Corporation
Salt Lake City, UT
10/00
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to
be free from defects in materials and workmanship under normal installa-
tion, use and service for a period of one (1) year from the date of purchase
as shown on the purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be
limited to repair or replacement (at our option), during the warranty period
of any part which proves defective in material or workmanship under
normal installation, use and service, provided the product is returned to
Rolls Corporation, TRANSPORTATION CHARGES PREPAID.
Products returned to us or to an authorized Service Center must be
accompanied by a copy of the purchase receipt. In the absence of such
purchase receipt, the warranty period shall be one (1) year from the date
of manufacture.
This warranty shall be invalid if the product is damaged as a
result of defacement, misuse, abuse, neglect, accident, destruction or
alteration of the serial number, improper electrical voltages or currents,
repair, alteration or maintenance by any person or party other than our
own service facility or an authorized Service Center, or any use violative of
instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties,
obligations or liabilities. ANY IMPLIED WARRANTIES, OBLIGA-
TIONS, OR LIABILITIES, INCLUDING BUT NOT LIMITED TO
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE, SHALL BE LIMITED IN
DURATION TO THE ONE YEAR DURATION OF THIS WRITTEN
LIMITED WARRANTY. Some states do not allow limitations on how
long an implied warranty lasts, so the above limitation may not apply to
you.
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF
THIS OR ANY OTHER WARRANTY, EXPRESSED OR IMPLIED,
WHATSOEVER. Some states do not allow the exclusion or limitation of
special, incidental or consequential damages so the above limitation or
exclusion may not apply to you. This warranty gives you specific legal
rights, and you may also have other rights which vary from state to state.
MX54s
ProMix Plus
3-Channel Stereo Mic Mixer
MX54 ProMix Plus
• Mixes three microphones to stereo XLR
outputs
•
Output level controls for mic or line-level output
• Transformer isolated outputs
• Phantom Power and Low-Cut switches for
each Mic input
• Battery and AC powered
The MX54s is a very useful microphone mixer. It's
perfect for sub-mixing microphones in an installa-
tion or recording application. The Phantom Power
and Low-Cut switches add to the versitility and
usefullness of the MX54.
SPECIFICATIONS
Input Impedance: 600 Ohms
Output Impedance: XLR 600 Ohms
THD + Noise: .02%
S/N Ratio: 84 dB
Frequency Response: 25 Hz - 16 kHz (+0 / -3 dB)
Max Output Level: + 14 dB
Max Input Level: -14 dB
Max Gain: +60 dB
Low Cut: -3 dB @ 100 Hz
Current Draw: 20 mA
Phantom Power: +18 VDC
Connectors: 3 Female XLR, 2 Male XLR, 1 1/4" TRS,
DC Power Jack
Size: 5.3" x 3.7" x 2"
Weight: 1 lbs.
+
-
BATTERIES
MADE IN USA
PAN
LEVEL
R L
010
CHANNEL
1
PAN
LEVEL
R L
010
CHANNEL
2
PAN
LEVEL
R L
010
CHANNEL
3
PHONES
AUX
clip
pwr
MADE IN USA
POWER
OFF - ON
MX54s
9V x 2
INTRODUCTION
Thank you for your purchase of the MX54s ProMix Plus. This unit is
designed and manufactured to mix three microphones together and send
their combined signals out stereo transformer-balanced XLR outputs. The
individually switchable phantom power and low-cut switches provide he
final touches which make the MX54s a valuable tool for any sound
reinforcement, musical, recording, or install application.
INSPECTION
1. Unpack and Inspect the MX54s package
Your MX54s was carefully packed at the factory in a protective carton.
Nonetheless, be sure to examine the unit and the carton for any signs of
damage that may have occurred during shipping. 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 complete the Warranty Registration Card and return it to the
factory.
DESCRIPTION
REAR PANEL
Mic Input: 1 - 3: XLR balanced inputs for connection to any standard
dynamic or condenser microphone.
Right and Left Outputs: Transformer balanced XLR output jacks for
connection to the next device in the signal chain such as a signal proces-
sor or amplifier.
Right and Left Trim controls: Screwdriver adjustable controls to vary the
level of each output. NOTE: These controls are set at mic level from the
factory. Turning them
counter-clockwise
increases the output level. These
controls do not effect the Aux/Headphone Output.
FRONT PANEL
Mic Level 1 - 3: These controls adjust the level of the corresponding Mic
channel. The level varies from -infinity (off) to +60 dB of gain (typical).
PAN 1 - 3: Adjusts the relative right/left level of each channel.
Phone/Aux: 1/4" TRS jack which may be connected to a pair of head-
phones for personal monitoring, or to an unbalanced input of a signal
processor or amplifier.
Power LED: Indicates the MX54s is on.
Clip LED: Indicates that clipping is about to occur or occurring in the
MX54s circuitry. This LED begins to light 3dB below actual circuit clipping.
Power Switch: Applies power to the MX54s.
Located on the right side of the unit is the +12 VDC power jack for connec-
tion to an optional +12 VDC (outside of the ring is positive) external power
supply. We recommend the Rolls PS27.
Locatd on the left side of the unit is the battery
compartment which houses two 9-Volt (alkaline
preferred) batteries.
Also on the left side are the Phantom Power and
Low-Cut switches.
As shown here, under each number is a P indicating
Phantom Power, and an L which indicates Low-Cut.
When the P switch is DOWN, the phantom power is ON, when it is UP, the
phantom power is OFF.When the L switch is UP, the low-cut is ON, when it
is DOWN, the low-cut is OFF.
SCHEMATIC
Document Number:
MX54S.SCH
Rev:
A
Sheet 1 of 1
Title: MX54S PROMIX 3 CH MIXER
Size:
FXa
C H 1
C H 2
C H 3
+VB
+VB
+VB
+V
+V
+V
+V
+V
+V
+VB
+V
+VB
+V
C L I P
J 6
2
3
1
J 4
R 7
1 0 K
C 2 0
4 7 U
1 2
3
X L R M P C
C 1 8
4 7 U
R 2 3
1 0 0 K
C 1 6
2 5 P F
R 2
4 . 9 9 K 1 %
1 12
S W 1 A
S W D I P - 6
R 1
4 . 9 9 K 1 %
C 1
1 U F 3 5 V N P
R 3 3 3 2 1 %
1 2
3
J 1
X L R F P C
C 2 1 U F 3 5 V N P
2 11
S W 1 B
S W D I P - 6
P 1
P 1 0 0 K
C 5
. 1
R 4 3 3 2 1 %
R 2 2
1 K
R 5
2 0 K 1 %
C 3
4 7 0 P F
R 6
2 0 K 1 %
C 4
4 7 0 P F
R 9
4 . 9 9 K 1 %
3 10
S W 1 C
S W D I P - 6
R 8
4 . 9 9 K 1 %
C 6
1 U F 3 5 V N P
R 1 0 3 3 2 1 %
1 2
3
J 2
X L R F P C
C 7 1 U F 3 5 V N P
4 9
S W 1 D
S W D I P - 6
P 2
P 1 0 0 K
C 1 0
. 1
R 1 1 3 3 2 1 %
R 1 2
2 0 K 1 %
C 8
4 7 0 P F
R 1 3
2 0 K 1 %
C 9
4 7 0 P F
R 1 6
4 . 9 9 K 1 %
5 8
S W 1 E
S W D I P - 6
R 1 5
4 . 9 9 K 1 %
C 1 1
1 U F 3 5 V N P
R 1 7 3 3 2 1 %
1 2
3
J 3
X L R F P C
C 1 2 1 U F 3 5 V N P
6 7
S W 1 F
S W D I P - 6
P 3
P 1 0 0 K
C 1 5
. 1
R 1 8 3 3 2 1 %
R 3 0
2 0 K 1 %
C 1 3
4 7 0 P F
R 2 0
2 0 K 1 %
C 1 4
4 7 0 P F
3
1
2
S W 2
S P S T
B T 2
B A T 9 V
B T 1
B A T 9 V
R 2 8
2 2 K
D 1
1 N 4 0 0 1
Q 1
2 N 3 9 0 4
D 3
L D R G
C R 1
1 N 4 1 4 8
C R 2
1 N 4 1 4 8
C R 3
1 N 4 1 4 8
D 2
L D R G
R 2 7
3 . 3 K
R 2 5
3 3 K
R 2 6
1 0 K
R 2 9
1 8 K
R 2 4
2 K
C R 4
1 N 4 1 4 8
5
6
7
8
U 1 B
4 5 6 0
3
2
1
4
U 2 A
4 5 6 0
5
6
7
8
U 2 B
4 5 6 0
2
3
1
4
U 3 A
4 5 5 6
1
E 2
W I R E
1
E 1
W I R E
T 1
R 1 9
1 0
C 1 7
1 K U F
T P 1
T P 1 0 K V
+VB
+V
1 2
3
J 7
C 1 9
4 7 U
R 4 0
1 0 0 K
R 4 1
1 K
C R 5
1 N 4 1 4 8
6
5
7
8
U 3 B
4 5 5 6
T 2
T P 2
T P 1 0 K V
C 2 1
2 5 P F
P 4
P 1 0 0 K
P 5
P 1 0 0 K
P 6
P 1 0 0 K
2
3
1
4
4 5 6 0
1
E 3
W I R E
ROLLS CORPORATION
5968 South 350 West
Salt Lake City,UT 84107
J A P D C
I N 9 - 1 5 V D C
X L R M P C
O u t p u t L e v e l T r i m
O U T
X F M R A U D I O
L I N E / H D P H O N E
P H O N E 1 / 4
O u t p u t L e v e l T r i m
J 5
O U T
X F M R
A U D I O
R 3 8
1 0 K
+VB
R 3 9
1 0 K
R 3 7
1 0 K
R 1 4
1 0 K
R 3 6
1 0 K
+VB
R 3 5
1 0 K
R 3 4
1 0 K
R 2 1
1 0 K
R 3 3
1 0 K
+VB
R 3 1
1 0 K
R 3 2
1 0 K
U 1 A
+VB
Date: 5-Oct-2000
PHNT PWR ON=DOWN
LOW CUT ON=UP
1 2 3
P L P L P L
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1
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2
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