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 pack-
ing 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 over-
all 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: 1/4" and 1/8" (3.5mm) 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
HEADPHON E
LEVEL
L
R1
L
R2
L
R3
L
R
OUTPUT
DC IN
12 - 16
VDC
+
-
(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
ROLLS CORPORATION
5968 s 350 w
Murray, Utah 84107
1
MX28.SCH B
25 August 2017
Size: Document Number:
Date:
Rev:
Sheet of
MX28 Mini Mix 6
Ba
BAL
MONO/RIGHT
LEFT
VCC
VCC
POWER
VCC
CHANNEL 1 OF 3
VB
VB
VB
VB
VB
VB
VB
VCC
VCC
BAL
MONO/RIGHT
LEFT
VCC
VB
VB
VB
BAL
MONO/RIGHT
LEFT
VCC
VB
VB
VB
RIGHT
LEFT
4 6
5
P1B
P100K X2
1 3
2
P1A
P100K X2
6
5
7
8
U1B
4560
2
3
1
4
U1A
4560
6
5
7
8
U2B
4560
2
3
1
4
U2A
4560
6
5
7
8
U3B
4560
2
3
1
4
U3A
4560
6
5
7
8
U4B
4560
2
3
1
4
U4A
4560
6
5
7
8
U5B
4556
3
2
1
4
U5A
4556
J1
PHONE 1/4
J2
PHONE 1/4
J3
PHONE 1/4
J5
PHONE 1/4
J6
PHONE 1/4
J7
PHONE 1/4
J11
PHONE 1/4
J10
PHONE 1/4
J9
PHONE 1/4
4 6
5
P2B
P100K X2
1 3
2
P2A
P100K X2
4 6
5
P3B
P100K X2
1 3
2
P3A
P100K X2
P7
P100K
P8
P100K
P9
P100K
1 3
2
P4A
P100K X2
4 6
5
P4B
P100K X2
1 3
2
P6A
P100K X2
4 6
5
P6B
P100K X2
C2
1U
C4
1U
C5
1U
C7
1U
C8
1U
C10
1U
C11
1U
C13
1U
C14
1U
C16
1U
C17
1U
R1
10K
R2
4.7K
R4
10K
R5
10K
R7
4.7K
R8
47K
R9
10K
R10
10K
R6
10K
R11
10K
R12
4.7K R13
47K
R14
10K
R15
10K
R16
10K
R17
4.7K
R18
47K
R19
10K
R20
10K
R21
10K
R22
4.7K R23
47K
R24
10K
R25
10K
R26
10K
R27
4.7K
R28
47K
R29
10K
R30
10K
R31
1K
R32
100
R33
100K
R34
1K
R35
100 R36
100K
R38
30
R39 47
R41
30
R42
47
R43
18K
C27
503
R44
22K
R45
10K
2
3
1
J4
JAPDC
D2LDSG
D1
1N4001
C1
1U
C21
120PF
C23
120PF
C26
47U
C24
47U
C19
10U
C20
10U
C6
120PF
C12
120PF
C18
120PF
C15
120PF
C9
120PF
C3
120PF
C25
1KUF
C22
47U
R3
47K
R40
1K
R37
1K
J8 3.5STJK
