INTRODUCTIONThank your for your purchase of the Rolls RM81 MIXMAX eight channel audiomixer. The RM81 is a microphone and line mixer in a single 19” rack space. It isintended for sound reinforcement or studio applications where several micro-phones or line sources need to be combined to a single output. Please review thismanual for proper operation.FEATURES:• 8 XLR Mic inputs• Individual phantom power switches for each channel• 8 1/4” unbalanced line inputs which may be internally jumpered to be lineoutputs.• Wide-range tone controls for each channel• RCA Aux/Bus input and pre-master output for cascading units or recordingINSPECTION1. Unpack and inspect the RM81 box and package.If obvious physical damage is noticed, contact the carrier immediately to make adamage claim. We suggest saving the shipping carton and packing materials forsafely transporting the unit in the future.2. Please complete the Warranty Registration Card and return it to the factory.DESCRIPTIONFRONT PANEL
LEVEL
TONE
bass
0 10 0 10 0 10 0 10 0 10
treble
LEVEL
TONE
basstreble
LEVEL
TONE
basstreble
LEVEL
TONE
basstreble
LEVEL
TONE
basstreble
LEVEL
TONE
basstreble
LEVEL
TONE
basstreble
LEVEL
TONE
LEVEL
basstreble
LEVEL
PWR

MI

C/

LIN

E

MIXER

RM
81

1 2 3 4 5 6 7 8

0 10 0 10 0 10 0 10
Each channel has an input VOLUME control to adjust the input level to thatchannel, a TONE control which cuts the signal up to 15 dB, below 200 Hz orabove 6 kHz.The MASTER VOLUME control adjusts the overall output level.REAR PANEL
CHANNEL 1
AUX
BUSS INPREFADE
OUT MAIN
OUT
MODEL RM81120 VAC50/60 Hz 15 VA
SERIAL NUMBER
81-
MADE IN U.S.A.
PHANTOM POWER
8 7 6 5 4 3 2 1
WARNING
:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN
OR MOISTURE.
CAUTION:
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT NOT REMOVE BACK.
NO USER SERVICABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL.
RISQUE DE CHOC - NE PAS ENLEVER
CHANNEL 2
CHANNEL 3
CHANNEL 4
CHANNEL 5
CHANNEL 6
CHANNEL 7
CHANNEL 8
NRTL /CAux/Bus Input: RCA jack which connects directly to the RM81 mix bus. The jac kmay be connected to another RM81 Pre-Fade Output - making this unit the“Master”.Pre-Fade Output: RCA jack for connection to another RM81 Aux/Bus Input,making this unit the “Slave”.Main Output: 1/4” TRS balanced jack containing the RM81 overall output signal.Phantom Power Switches: 8 individual DIP switches for applying 12 Volts ofphantom power to the indicated channel. The phantom power is for poweringcondenser microphones.Channel Inputs 1 - 8: 1/4” TS unbalanced, or XLR balanced input jacks.
CH 6
CH 7
MA S T E R
+12V
-12V
-12V
-12V
-12V
-12V
+12V
+12V
-12V -12V
-12V
-12V -12V
-12V
-12V
+12V
+12V
+12V
+12V
+12V
+12V +12V
+12V
+12V
+12V
+12V
+12V
+12V
+12V
+12V
+12V
+12V
+12V
-12V
-12V
CH 8
AU X/ BUS IN
PR E FAD E OU T
R1 0 7 10 0
R1 1 2
10 K
R2 1 2
10 K
R3 1 2
10 K
R4 1 2
10 K
R5 0 7
10 0
R5 1 2
10 K
R6 1 2
R7 1 2
R8 1 2
J9
PH ON E 1/4
J1 1
PH ON E 1/4
J1 2
PH ON E 1/4
J1 3
PH ON E 1/4
J1 4
PH ON E 1/4
J1 5
PH ON E 1/4
J1 6
PH ON E 1/4
J1 8
PH ON E 1/4
J1 7
PH ON E 1/4
R1
10 K
R2
10 0
R3
10 K
R4
10 0
R6
CR1
1N 4 0 0 1
CR2
1N 4 0 0 1
CR3
1N 4 0 0 1
CR4
1N 4 0 0 1
C5
1U F
C1 0 3
10 U
C2 0 3
10 U
C1 0 1
47 U
C1 0 2
47 U
C2 0 1
47 U
C2 0 2
47 U
C3 0 1
47 U
C3 0 2
47 U
C4 0 3
10 U
C4 0 1
47 U
C4 0 2
47 U
C5 0 3
10 U
C5 0 1
47 U
C5 0 2
47 U
C6 0 3
10 U
C6 0 1
47 U
C6 0 2
47 U
C7 0 3
10 U
C7 0 1
47 U
C7 0 2
47 U
C8 0 3
10 U
C8 0 1
47 U
C8 0 2
47 U
C2
1U
C1
12 0 P F
116
SW 1A D IP S W -8
C5 0 5 1 2 0 P F
C5 0 4
12 0 P F
C4 0 4
12 0 P F
C3 0 4
12 0 P F
C2 0 4
12 0 P F
C1 0 4
12 0 P F
C6 0 4
12 0 P F
C8 0 4
12 0 P F
C7 0 4
12 0 P F
P1
P1 0 0 K
J2 0
RC A PC
1 2
3
J1
XL R F P C
1 2
3
J2
XL R F P C
1 2
3
J3
XL R F P C
1 2
3
J4
XL R F P C
1 2
3
J5
XL R F P C
1 2
3
J6
XL R F P C
1 2
3
J7
XL R F P C
1 2
3
J8
XL R F P C
P1 6
P1 0 0 K
P1 7
P1 0 0 K
R1 1 4
4.7 K
P1 5
P1 0 0 K
R8 1 4
4.7 K
R2 1 4
4.7 K
P3
P1 0 0 K
P5
P1 0 0 K
R3 1 4
4.7 K
P7
P1 0 0 K
R4 1 4
4.7 K
P9
P1 0 0 K
R5 1 4
4.7 K
R6 1 4
4.7 K
P1 1
P1 0 0 K
R7 1 4
4.7 K
P1 3
P1 0 0 K
C8 0 6
25 P F
C7 0 7
25 P F
C6 0 6
25 P F
C3 0 5
12 0 P F
C2 0 5
12 0 P F
C1 0 6
25 P F
C2 0 6
25 P F
C3 0 6
25 P F
C5 0 6
25 P F
C4 0 6
25 P F
C6 0 5
12 0 P F
C7 0 5
12 0 P F
C8 0 5
12 0 P F
3
C
2
B
1
A
3
C
2
B
1
A
3
C
2
B
1
A
3
C
2
B
1
A
3
C
2
B
1
A
3
C
2
B
1
A
3
C
2
B
1
A
3
C
2
B
1
A
R5 0 6 47 K
C4 0 5
12 0 P F
413
SW 1D
DI P S W - 8
R4 0 7 100
512
SW 1E
DI P S W - 8
C1 0 5
12 0 P F
215
SW 1B
DI P S W - 8
R2 0 7 100
314
SW 1C
DI P S W - 8
R3 0 7 10 0
C3 0 3 10U
R6 0 7 100
710
SW 1G
DI P S W - 8
R7 0 7 100
R8 0 7 10 0
8 9
SW 1H
DI P S W - 8
J1 9
RC A PC R5
10 0
I
1
G
2
O3
U1 4
78 1 2
I
2
G1
O3
U1 5
79 1 2
SW 2
SW SPST
PL 1
PL UG AC M AL E
R1 0 3
33 2
R1 0 4
33 2
R1 0 5
49 .9 K
R1 0 8
49 .9 K
C1 0 7
.1U F
R1 1 0
4.7 K
P2
P1 0 0 K C10 8
.01
R1 0 9
4.7 K
P4
P1 0 0 K
C2 0 8
.01
R2 1 0
4.7 K
R2 0 9
4.7 K
C2 0 7
.1U F
2
31
4
U1 3 A
45 6 0
T1
MC I 4 07 402 4
6
57
8
U2 B
45 6 0
2
31
4
U2 A
45 6 0
6
57
8
U5 B
45 6 0
6
57
8
U3 B
45 6 0
2
31
4
U3 A
45 6 0
6
57
8
U6 B
45 6 0
6
57
8
U9 B
45 6 0
6
57
8
U8 B
45 6 0
5
67
8
U7 B
45 6 0
3
21
4
U4 A
45 6 0
2
31
4
U5 A
45 6 0 2
31
4
U6 A
45 6 0
5
67
8
U4 B
45 6 0
3
21
4
U1 A
45 6 0
5
67
8
U1 0 B
45 6 0
6
57
8
U1 1 B
45 6 0 6
57
8
U1 2 B
45 6 0
2
31
4
U1 2 A
45 6 0
2
31
4
U1 1 A
45 6 0
3
21
4
U1 0 A
45 6 0
3
21
4
U7 A
45 6 0
2
31
4
U8 A
45 6 0 2
31
4
U9 A
45 6 0
C6
10 U F
5
67
8
U1 B
45 6 0
6
57
8
U1 3 B
45 6 0
CR5
LD S R
C7
50 3
R1 0 1
4.99K
R1 0 2
4.99K
R2 0 1
4.99K
R2 0 2
4.99K
R3 0 1
4.99K
R3 0 2
4.99K
R4 0 1
4.99K
R4 0 2
4.99K
R5 0 1
4.99K
R5 0 2
4.99K
R8 0 1
4.99K
R8 0 2
4.99K
R6 0 1
4.99K
R6 0 2
4.99K
R2 0 3
33 2
R2 0 4
33 2
R3 0 3
33 2
R3 0 4
33 2
R4 0 3
33 2
R4 0 4
33 2
R5 0 3
33 2
R5 0 4
33 2
R6 0 3
33 2
R6 0 4
33 2
R7 0 3
33 2
R7 0 4
33 2
R8 0 3
33 2
R8 0 4
33 2
R2 0 5
49 .9 K R2 0 8
49 .9 K
R3 0 5
49 .9 K R3 0 8
49 .9 K
R4 0 5
49 .9 K R4 0 8
49 .9 K
R5 0 5
49 .9 K R5 0 8
49 .9 K
R8 0 5
49 .9 K
R8 0 8
49 .9 K
R7 0 8
49 .9 K
R6 0 5
49 .9 K R6 0 8
49 .9 K
R1 0 6 18K
R2 0 6
18 K
R4 0 6 18K
R3 0 6 18K
R6 0 6 18 K
R7 0 6 18K
R8 0 6 18K
R6 1 3 1 0 0
R7 1 3 1 0 0
R8 1 3
10 0
R5 1 3 1 0 0
R4 1 3 1 0 0
R3 1 3 10 0
R2 1 3 10 0
R1 1 3 10 0
R7 0 1
4.9 9 K
R7 0 2
4.99K
R7 0 5
49 . 9 K
C1 3
10 00U F 16V
C1 4
10 00U F 16V
1
ROLLS CORPORATION
5968 South 350 West
Salt Lake City, Utah84107
118-Jun-1999
Title
Size:
Date:
Rev:
of
Rc
RO LL S M IX MA X 8 R M8 1
D
+12V
116
SW 1A D IP S W -8
C3 0 7
.1U F
R3 1 0
4.7 K
P6
P1 0 0 K
C3 0 8
.01
R3 0 9
4.7 K
C4 0 7
.1U F
R4 1 0
4.7 K
P8
P1 0 0 K
C4 0 8
.01
R4 0 9
4.7 K
C5 0 7
.1U F
R5 1 0
4.7 K
P1 0
P1 0 0 K
C5 0 8
.01
R5 0 9
4.7 K
C6 0 7
.1U F
R6 1 0
4.7 K
P1 2
P1 0 0 K C60 8
.01
R6 0 9
4.7 K
C7 0 7
.1U F
R7 1 0
4.7 K
P1 4
P1 0 0 K C70 8
.01
R7 0 9
4.7 K
C8 0 7
.1U F
R8 1 0
4.7 K
C8 0 8
.01
R8 0 9
4.7 K 1 0 K
10 K
10 K
Document Number: RM81.SCH
Sheet:
4.7 K
PO W E R
CONFIGURING THE 1/4” INPUT JACKS AS DIRECT OUTSThe eight 1/4” jacks come from the factory as line inputs and are electricallymixed with the XLR jacks. They may be used together if desired. To configure achannel’s 1/4” jack as a Direct Out, first remove the RM81 lid. For each channelthere is a three-pin header with a shorting jumper on two pins. The setting is on“IN”. By moving the shorting jumper to the other side labeled “OUT”, the jack thenbecomes a Direct Output.SCHEMATIC