Rolls PROMIX IV MX124 User manual

M
X124
P
roMix IV
Q
u
i
c
k
S
tart
G
u
id
e
R
O
LL
S
CO
RP
O
RATI
ON
SALT LAKE CITY
,
UTA
H
10
/
0
5
SPECIFICATIONS
I
nput Impedance: 600 Ohms
O
utput Impedance: XLR 600 Ohms, 1/4” and 1/8” 10 Ohms
T
HD + Noise: .02%
S
/N Ratio: 84 dB
F
requenc
y
Response: 25 Hz - 16 kHz (+0 / -3 dB)
M
ax Output Level: + 14 dB
M
ax Input Level: -14 dB
M
ax Gain: +55 dB
L
ow Cut: -3 dB @ 100 Hz
C
urrent Draw: 30 mA
P
hantom Power: +18 VDC
C
onnectors: 4 Female XLR, 2 Male XLR, 1 1/4” TRS, 1: 1/8” (3.5mm)
DC Power Jack (5.5 X 2.1 mm tip negative)
S
ize: 6.3”w x 3.7”d x 2.3” h
Weight: 1.5 lbs.
S
ETTING THE LOW CUT AND PHANTOM POWER SWITCHES
O
n 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
i
ndicates 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.
Phantom
Low Cut
Phantom
Low Cut
Phantom
Low Cut
Phantom
Low Cut
Phan Pwr ON=dwn
Low Cut ON=up

INTRODUCTION
T
hank
y
ou for
y
our purchase of the MX124 ProMix IV. This unit is designed and manufac-
tured to mix four microphones together and send their combined signals out stereo trans-
former-balanced XLR outputs, or front panel 1/4” and 1/8” stereo outputs. The individuall
y
switchable phantom power and low-cut switches provide the nal touches which make the
M
X124 a valuable tool for an
y
sound reinforcement, musical, recording, or install applica-
tion.
INSPECTION
1. Unpack and Inspect the MX124 package
Your MX124 was carefull
y
packed at the factor
y
in a protective carton. Nonetheless, be
sure to examine the unit and the carton for an
y
signs of damage that ma
y
have occurred
during shipping. If obvious ph
y
sical damage is noticed, contact the carrier immediatel
y
to
make a damage claim. We suggest saving the shipping carton and packing materials for
safel
y
transporting the unit in the future.
2. Please visit our website at www.rolls.com
,
click on the Register Your Warrant
y
Here
text and follow the instructions to register
y
our MX124. Or complete the Warrant
y
Regis--
tration Card and return it to the factor
y
.
DESCRIPTION
REAR PANEL
M
ic Input: 1 - 4: XLR balanced inputs for connection to an
y
standard d
y
namic or condens-
e
r microphone.
R
ight and Left Outputs: Transformer balanced XLR output jacks for connection to the next
device in the signal chain such as a signal processor or amplier .
R
ight and Left Trim controls: Screwdriver adjustable controls to var
y
the level of each
output. Turning these controls clockwise increases the output level. These controls do not
e
ect the Aux/Headphone Output.
F
RONT PANEL
M
ic Level 1 - 4: These controls adjust the level of the corresponding Mic channel. The
level varies from -innit
y
(o) to max gain.
P
AN 1 - 4: Adjusts the relative right/left level of each channel.
P
hone/Aux: 1/4” and 1/8” (3.5mm) TRS jacks which ma
y
be connected to a pair of head-
phones for personal monitoring, or to a stereo unbalanced input of a signal processor,
a
mplier, or camera.
C
lip LED: Indicates that clipping is about to occur or occurring in the MX54s circuitr
y
. This
L
ED begins to light 3dB below actual circuit clipping.
R
IGHT HAND SIDE
-
Batter
y
compartment which houses two 9-Volt (alkaline recommended) batteries.
-
VDC power jack for connection to the Rolls PS27s; VDC (outside of the ring is
positive) external power suppl
y
.
-
Power Switch: Applies power to the MX124.
SCHEMATIC