MX902
Professional Compact Mixer
MIC 2
MIC 1
MIC 3
AUX 1
SEND
AUX 2
SEND
PHANTOM
PWR
RIGHT OUT
LEFT OUT
AUX 1
4/LEFT/MONO
5/RIGHT
6/LEFT/MONO
8/LEFT/MONO
RET LEFT/MONO
TRIM
+6
TRIM
+6
TRIM
+50
+6
+50
+50
dB
dB
dB
AUX 1
RET RIGHT
LINE 1
-6 dB
LINE 2
-6 dB
LINE 3
-6 dB
7/RIGHT
9/RIGHT
CLIP
L
R
PWR
12 - 18 VDC
+
-15 12.5 k +15
HIGH
-15 12.5 k +15
HIGH
-15 12.5 k +15
HIGH
-15 12.5 k +15
HIGH
-15 12.5 k +15
HIGH
-15 12.5 k +15
HIGH
R
AUX 2 RET
-
POWER
L
60
LOW
60
LOW
60
LOW
60
LOW
60
LOW
60
LOW
-15
+15
-15
+15
-15
+15
-15
+15
-15
+15
MX902
-15
+15
0
10
0
10
0
10
0
10
0
10
0
10
AUX 2
0
10
AUX 2
RETURN
AUX 2
AUX 2
AUX 2
AUX 2
AUX 2
0
10
0
10
0
10
0
10
AUX 1
0
10
AUX 1
0
10
AUX 1
0
10
AUX 1
PAN
AUX 1
PAN
AUX 1
PAN
AUX 1
HDPHN
OUT
RETURN
L
R
L
R
L
R
L
R
L
R
L
R
-OO
+15
BAL
BAL
BAL
LEVEL
HDPHN
-OO
+15
-OO
+15
-OO
+15
-OO
+15
-OO
+15
-OO
+15
-OO
+15
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
LEVEL
8/9
MAIN
1
2
3
4/5
6/7
OWNERS MANUAL
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Front Panel
CHANNEL DESCRIPTIONS
HIGH: Boosts or cuts the 12.5 kHz or high frequency portion of the signal.
LOW: Boosts or cuts the 60 Hz or low frequency portion of the signal.
AUX 2: Controls the amount of post-fader signal that is sent to the Aux 2 bus
and output.
-15 12.5 k +15
HIGH
-15 12.5 k +15
HIGH
AUX 1: Controls the amount of pre-fader signal that is sent to the Aux 1 bus
and output.
60
LOW
60
LOW
-15
+15
-15
+15
PAN: Varies the amount of relative signal sent from Channels’ 1 through 3 to
the Main Level control.
0
10
0
10
AUX 2
AUX 1
PAN
AUX 2
AUX 1
BAL
0
10
0
10
BAL: Varies the amount of stereo signal from channels 5/6 through 8/9 to the
Main Level control.
L
R
L
R
LEVEL: Controls the overall output signal level of the channel.
-OO
+15
-OO
+15
LEVEL
LEVEL
3
4/5
MASTER DESCRIPTIONS
AUX 2 RETURN: Controls the amount of input signal from the RCA Aux 2 Return
CLIP
L
R
PWR
jacks.
AUX 1 RETURN: Controls the amount of input signal from the Aux 1 Right and Left
Return jacks.
12 - 18 VDC
+
L
AUX 2 RET
-
POWER
R
MX902
HEADPHONE LEVEL: Controls the amount of level of signal from the Headphone
Output.
HEADPHONE OUTPUT: 1/4” TRS stereo jack for connection to stereo headphones.
NOTE: Do not use a mono 1/4” TS plug in this jack. Doing so may result
in serious damage to the MX902.
0
10
AUX 2
RETURN
0
AUX 1 10
HDPHN
OUT
RETURN
MAIN LEVEL: Controls the amount of signal sent to the Right/Left output jacks.
-OO
+15
LEVEL
HDPHN
-OO
+15
LEVEL
MAIN
2
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Jack Panel Description
MIC 2
MIC 1
MIC 3
AUX 1
SEND
AUX 2
SEND
PHANTOM
PWR
RIGHT OUT
LEFT OUT
AUX 1
RET LEFT/MONO
4/LEFT/MONO
6/LEFT/MONO
8/LEFT/MONO
TRIM
+6
TRIM
+6
TRIM
+50
+6
+50
+50
dB
dB
dB
AUX 1
RET RIGHT
LINE 1
-6 dB
LINE 2
-6 dB
LINE 3
-6 dB
5/RIGHT
7/RIGHT
9/RIGHT
Channels 1 through 3
MIC INPUT: XLR input jack for microphone level or balanced signals.
TRIM: Controls the amount of input gain from +6 to +50 dB.
LINE: 1/4” unbalanced input for instrument of line level signals.
PHANTOM POWER SWITCH: Engages the +24 volts of phantom power, used to power con-
denser microphones.
Channels 4/5 through 8/9
LEFT: 1/4” unbalanced input for instrument or line level signals.
RIGHT: 1/4” unbalanced input for instrument or line level signals.
Master
AUX 1 and 2 SEND: 1/4” unbalanced jacks for sending out the signals present on the Aux 1 and 2
buses.
RIGHT OUT: 1/4” TRS balanced main right output.
LEFT OUT: 1/4” TRS balanced main left output.
AUX 1 RET. RIGHT and LEFT: 1/4” unbalanced jacks for receiving stereo signals sent from the
Aux 1 bus (usually through an effects processor).
AUX 2 RET. Stereo RCA jacks for receiving stereo signals send from the Aux 2 bus, or may be
used as an auxiliary stereo source input such as a CD or cassette player.
Side Panel
12 - 18 VDC: For connection to a sleeve positive, DC power adapter.
POWER Switch: Applies power to the MX902 when connected to a proper power source.
3
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MIC 2
MIC 1
MIC 3
AUX 1
SEND
AUX 2
SEND
RIGHT OUT
PHANTOM
PWR
LEFT OUT
AUX 1
RET LEFT/MONO
4/LEFT/MONO
6/LEFT/MONO
8/LEFT/MONO
+50
+6
+50
+50
+6
+6
dB
dB
dB
AUX 1
RET RIGHT
LINE 1
-6 dB
LINE 2
-6 dB
LINE 3
-6 dB
5/RIGHT
7/RIGHT
9/RIGHT
from
Right Output
from
Left Output
to Effects Input
STEREO EFFECTS DEVICE
SIGNAL PROCESSOR CONNECTION
Use Aux 1 Output to connect to the Input of your signal processor which may be an echo unit, a
reverb, or multi effects unit. Aux 1 is used because the signal is taken after the channel fader
which is a typical setup for a signal processor. The right and left outputs of the processor are then
connected to the Aux 1 Right and Left Return jacks. The level of signal going into the signal pro-
cessor is controlled by the Aux 1 control on each individual MX902 channel, and the signal
processor’s input level control. The level of signal going back into the MX902 is controlled by Aux 1
Return Level control on the MX902 front panel, and by the signal processor’s output level control.
4
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LIVE CONNECTION EXAMPLE
The diagram shown below is a possible connection scheme for a live application. Connect instru-
ments and microphones to the appropriate input jacks. If condenser microphones requiring phan-
tom power are being used, press the Phantom Power switch in. Aux 2 is used as a monitor output
because the signal is taken before the channel fader - this is typically a monitor send. Aux 1 may
be connected to a signal processor as shown on page 4.
Connect the Right and Left main outputs to the main amplification system. If the system being
used is mono, either MX902 Right or Left output may be used.
MIC 2
MIC 1
MIC 3
AUX 1
SEND
AUX 2
SEND
PHANTOM
PWR
RIGHT OUT
LEFT OUT
AUX 1
RET LEFT/MONO
4/LEFT/MONO
6/LEFT/MONO
8/LEFT/MONO
+50
+6
+50
+50
dB
+6
+6
dB
dB
AUX 1
RET RIGHT
LINE 1
-6 dB
LINE 2
-6 dB
LINE 3
-6 dB
5/RIGHT
7/RIGHT
9/RIGHT
MONITOR AMPLIFIER
MAINS AMPLIFIER
VOLUME
1
VOLUME
2
POWER AMPLIFIER RA2100B
5
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SCHEMATIC
4
6
4
3
4
5
8
8
1
5
8
8
4
6
8
2
4
2
1
3
4
4
4
8
8
8
4
2
2
5
5
4
2
8
4
8
8
3
1
6
4
4
4
3
1
2
3
6
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SPECIFICATIONS
Input Impedance:
Output Impedance:
Max Input Level:
Output Level:
10kW bal./unbal.
50W
+4 dBm XLR, +10 dBV 1/4”
+12 dBV max
Max Gain:
Phantom Power:
EQ Centers:
80 dB XLR, 74 dB 1/4”
+24 Volts DC
High: 12.5kHz
Low: 60Hz
128 dB
S/N Ratio:
THD:
<.003%
IMD (SMPTE):
CMRR:
Size:
Weight:
Power:
<.003%
52 dB (typ.) Mic
9” x 10” x 1.64”
3 lbs.
+12 VDC, 150 mA
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be free from defects in materials and
workmanship under normal installation, use and service for a period of one (1) year from the date of pur-
chase 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, TRANSPORTA-
TION CHARGES PREPAID. Products returned to us or to an authorized Service Center must be accompa-
nied 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 IM-
PLIED WARRANTIES, OBLIGATIONS, 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 CONSEQUEN-
TIAL DAMAGES FOR BREACH OF THIS OR ANY OTHER WARRANTY, EXPRESSED OR IM-
PLIED, 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.
ROLLS CORPORATION
SALT LAKE CITY, UTAH
4/96
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