INTRODUCTION
Thank y
ou f
or y
our purchase of the MX54s ProMix Plus
. This unit is
designed and manufactured to mix three microphones together and send
their combined signals out stereo tr
ansf
or
mer-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
Y
our MX54s w
as carefully pac
k
ed at the f
actor
y in a protectiv
e car
ton.
Nonetheless
, be sure to e
xamine the unit and the car
ton f
or 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.
W
e
suggest sa
ving the shipping car
ton and pac
king mater
ials f
o
r
saf
ely tr
anspor
ting the unit in the future
.
2
. Please complete the
W
arr
anty Registr
ation Card and retur
n it to the
fa
ctor
y.
DESCRIPTION
REAR P
ANEL
Mic Input: 1 - 3: XLR balanced inputs for connection to any standard
dynamic or condenser microphone.
Right and Left Outputs:
T
ransf
or
mer balanced XLR output jac
ks f
o
r
connection to the next device in the signal chain such as a signal proces-
sor or amplifier
.
Right and Left
T
rim controls:
Scre
wdr
iv
er adjustab
le controls to v
a
ry
the
le
v
e
l of each output.
NO
TE:
These contr
ols are set at mic le
vel fr
om the
factor
y
.
T
u
rning
them
counter-cloc
kwise
increases the output le
v
el.
These
controls do not effect the Aux/Headphone Output.
FR
ONT P
ANEL
Mic Le
v
el 1 - 3:
These controls adjust the le
v
el of the corresponding Mic
channel.
The le
v
e
l v
a
ries from -infinity (off) to +60 dB of gain (typical).
P
AN 1 - 3:
Adjusts the relativ
e r
ight/left le
v
el of each channel.
Phone/A
ux:
1/4"
TRS jac
k which ma
y be connected to a pair of head-
phones for personal monitoring, or to an unbalanced input of a signal
processor or amplifier
.
P
o
w
er LED:
Indicates the MX54s is on.
Clip LED: Indicates that clipping is about to occur or occurring in the
MX54s circuitr
y.
This LED begins to light 3dB belo
w actual circuit clipping.
P
o
w
er Switch:
Applies po
wer to the MX54s
.
Located on the r
ight side of the unit is the +12
VDC po
w
er jac
k f
or connec-
tion to an op12
VDC (outside of the r
ing is positiv
e) e
xter
nal po
w
e
r
supply
. W
e
recommend the Rolls PS27.
Locatd on the left side of the unit is the battery
compar
tment which houses tw
o 9-V
olt (alkaline
preferred) batteries.
Also on the left side are the Phantom P
o
wer and
Low-Cut switches.
As shown here, under each number is a P indicating
Phantom P
o
w
e
r,
and an L which indicates Lo
w-Cut.
When the P s
witch is DO
WN, the phantom po
wer is ON, when it is UP
, the
phantom po
w
er is OFF
.When the L s
witch is UP
, the lo
w-cut is ON, when it
is DO
WN, the lo
w-cut is OFF
.
SCHEMA
TIC
Document Number:
MX54S.
SCH
Rev:
A
Sheet 1 of 1
Title: MX54S PROMIX 3 CH MIXER
Size:
FXa
C
H
1
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1
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1
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W
IR
E
ROLLS CORPORATION
5968 South 350 West
Salt Lake City,UT 84107
JA
P
D
C
IN
9
-1
5
V
D
C
X
LR
M
P
C
O
ut
pu
t L
ev
el
T
rim
O
U
T
X
FM
R
A
U
D
IO
LI
N
E
/H
D
P
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N
E
P
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O
N
E
1
/4
O
ut
pu
t L
ev
el
T
rim
J5
O
U
T
X
FM
R
A
U
D
IO
R
38
10
K
+VB
R
39
10
K
R
37
10
K
R
14
10
K
R
36
10
K
+VB
R
35
10
K
R
34
10
K
R
21
10
K
R
33
10
K
+VB
R
31
10
K
R
32
10
K
U
1A
+VB
Date: 5-Oct-2000
PHNT PWR ON=DOWN
LOW CUT ON=UP
1 2 3
P L P L P L
