MX28
Mini-Mix VI
Owners Manual
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 DURA-
TION 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 SPE-
CIAL, 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.
MX28 MINIMIX VI
• Three stereo inputs - 2: 1/4" unbal per
channel.
• Individual 1/4" Right and Left outputs
• Pan control for each channel
• Two Headphone outputs
The MX28 is the ideal mixer for anyone needing
to mix up to three stereo signals. Keyboards,
stereo guitar effects, even sources like CD play-
ers or cassette players can be mixed together
maintaining their true stereo separation.
PAN
1
PAN
2
PAN
3
PHONE OUTS
R
L
1
R
L
2
R
L
3
R
L
OUTPUT
DC IN
12 - 16
VDC
+
-
MX28
STEREO
MINI-MIX VI
LEVEL
1
LEVEL
2
LEVEL
3
MASTER
LEVEL
HEADPHONE
LEVEL
SPECIFICATIONS
Input Impedance: 10K W
Output Impedance: 100 W
Max Gain: +27 dBV
Max Input Level: +30 dBV
Max Output Level: +13 dB
Frequency Response: 20Hz - 20kHz +/- 1 dBV
THD + Noise: <.005%
Power: 12 VDC 150 mA adapter (center negative)
Weight: 1.2 lbs. (.49 Kg)
Size: 4.25" x 1.75" x 4.5" (WxHxD)
Rolls Corporation
Salt Lake City, UT
9/95
Thank you for your purchase of the MX28 MiniMix VI. The MX28 is a three
channel true stereo mixer designed for keyboard or other stereo line level
signal mixing.
INSPECTION
1. Unpack and inspect the MX28 box and package.
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
FRONT PANEL
LEVEL 1 - 3: Volume Controls:
Adjusts the amount of input signal
to the indicated channel.
MASTER LEVEL: Master volume
control, adjusts the amount of
overall signal sent to the Main Right
and Left outputs.
HEADPHONE LEVEL: Adjusts the
amount of signal sent to the Head-
phone Output.
PAN 1 - 3: varies the relative amount of right and left signal from the
channel to the mix bus.
PHONE OUTS: Two 1/4" TRS Stereo jacks for connection to stereo
headphones.
REAR PANEL
CH 1 - Ch 3 INPUTS: 1/4" unbal-
anced inputs
The Right input is the MONO input.
Right and Left MAIN OUTPUTS: 2:
1/4" unbalanced outputs containing
the three mixed stereo signals.
DC IN: Power jack - accepts +12 to
+16 volts DC (outside of the barrel
is positive).
OPERATION
Shown below is an example setup for the MX28. The power adapter is not
shown. It should be conected to the proper voltage, grounded AC outlet.
SCHEMATIC
MX28
LEVEL
1
BAL
LEVEL
2
BAL
LEVEL
3
BAL
MASTER
LEVEL
HEADPHONE
LEVEL
L
R
1
L
R
2
L
R
3
L
R
OUTPUT
DC IN
12 - 16
VDC
+
-
122-Apr-1999
Document Number:
Date: Sheet of 1
Ba
M X 2 8 T H R E E C H A N N E L S T E R E O M I X E R
M X 2 8 . S C H
A
B A L
M O N O / R I G H T
L E F T
VCC
VCC
P O W E R
VCC
C H A N N E L 1 O F 3
VB
VB
VB
VB
VB
VB
VB
VCC
VCC
VCC
VCC
M O N O / R I G H T
L E F T
VCC
VB
VB
VB
M O N O / R I G H T
L E F T
VCC
VB
VB
VB
R I G H T
L E F T
4 6
5
P 1 B
P 1 0 0 K X 2
1 3
2
P 1 A
P 1 0 0 K X 2
6
5
7
8
U 1 B
4 5 6 0
2
3
1
4
U 1 A
4 5 6 0
6
5
7
8
U 2 B
4 5 6 0
2
3
1
4
U 2 A
4 5 6 0
6
5
7
8
U 3 B
4 5 6 0
2
3
1
4
U 3 A
4 5 6 0
6
5
7
8
U 4 B
4 5 6 0
2
3
1
4
U 4 A
4 5 6 0
6
5
7
8
U 5 B
4 5 6 0
3
2
1
4
U 5 A
4 5 6 0
Q 5
2 N 3 9 0 4
J 1
P H O N E 1 / 4
J 2
P H O N E 1 / 4
J 3
P H O N E 1 / 4
J 5
P H O N E 1 / 4
J 6
P H O N E 1 / 4
J 7
P H O N E 1 / 4
J 1 1
P H O N E 1 / 4
J 1 0
J 8
P H O N E 1 / 4
J 9
P H O N E 1 / 4
4 6
5
P 2 B
P 1 0 0 K X 2
1 3
2
P 2 A
P 1 0 0 K X 2
4 6
5
P 3 B
P 1 0 0 K X 2
1 3
2
P 3 A
P 1 0 0 K X 2
P 7
P 1 0 0 K
P 8
P 1 0 0 K
P 9
P 1 0 0 K
1 3
2
P 4 A
P 1 0 0 K X 2
4 6
5
P 4 B
P 1 0 0 K X 2
1 3
2
P 1 0 0 K X 2
4 6
5
P 1 0 0 K X 2
C 2
1 U
C 4
1 U
C 5
1 U
C 7
1 U
C 8
1 U
C 1 0
1 U
C 1 1
1 U
C 1 3
1 U
C 1 4
1 U
C 1 6
1 U
C 1 7
1 U
R 1
1 0 K
R 2
4 . 7 K
R 4 R 5
1 0 K
R 7
4 . 7 K
R 8
4 7 K
R 9 R 1 0
1 0 K
R 6
1 0 K
R 1 1
1 0 K
R 1 2
4 . 7 K
R 1 3
4 7 K
R 1 4
1 0 K
R 1 5
1 0 K
R 1 6
1 0 K
R 1 7
4 . 7 K
R 1 8
4 7 K
R 1 9
1 0 K
R 2 0
1 0 K
R 2 1
1 0 K
R 2 2
4 . 7 K
R 2 3
4 7 K
R 2 4
1 0 K
R 2 5
1 0 K
R 2 6
1 0 K
R 2 7
4 . 7 K
R 2 8
4 7 K
R 2 9
1 0 K
R 3 0
1 0 K
R 3 1
1 K
R 3 2
1 0 0
R 3 3
1 0 0 K
R 3 4
1 K
R 3 5
1 0 0
R 3 6
R 3 8
3 0
R 3 9
1 0
R 4 1
3 0
R 4 2
1 0
R 4 3
1 8 K
C 2 7
5 0 3
R 4 4
2 2 K
R 4 5
2 K
2
3
1
J 4
J A P D C
D 2 L D S G
D 1
1 N 4 0 0 1
C 1
1 U
C 2 1
1 2 0 P F
C 2 3
1 2 0 P F
Q 1
M P S A 0 6
Q 3
Q 4
2 N 2 9 0 7
C 2 6
4 7 U
C 2 4
4 7 U
C 1 9
1 0 U
C 2 0
1 0 U
C 6
1 2 0 P F
C 1 2
1 2 0 P F
C 1 8
1 2 0 P F
C 1 5
1 2 0 P F
C 9
1 2 0 P F
C 3
1 2 0 P F
C 2 5
1 K U F
Q 2
2 N 2 9 0 7
C 2 2
4 7 U
R 3
4 7 K
R 4 0
1 K
R 3 7
1 K
1 0 K
1 0 K
B A L
B A L
P H O N E 1 / 4 "
1 0 0 K
P 6 A
P 6 B
M P S A 0 6
R O L L S C O R P O R A T I O N
5 1 4 3 S o u t h M a i n S t r e e t
S a l t L a k e C i t y , U T 8 4 1 0 7
R e v
T i t l e
S i z e
(MIDI Signal)
To mixer or
recording device
R
L
1
R
L
2
R
L
3
R
L
OUTPUT
DC IN
12 - 16
VDC
+
-
MX28
STEREO
MINI-MIX VI
LEVEL
1
BAL
LEVEL
2
BAL
LEVEL
3
BAL
MASTER
LEVEL
HEADPHONE
LEVEL
Synth Module
Synth Module
-
1
-
2
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