Thank you for your purchase of the MB35 ProMatch USB Stereo Dual Con-
verter. Specifically, the MB35 converts consumer level stereo RCA signals
to balanced XLR professional line level - and back.
WARRANTY
For compete information on the Rolls 1 Year Warranty, and to register this
l e v e l
. . . a n
- B r o
- I n s
- S t u
DESCRIPTION
REAR PANEL
+4 dB IN LEFT and RIGHT XLR jacks: Female XLR jacks to be connected
to the output of a professional line-level device such as a sound reinforce-
ment mixing board or recording device.
+4 dB OUT LEFT and RIGHT XLR jacks: Male XLR jacks to be connected
to the input of a professional line-level device such as a mixer or recording
device.
RCA - Line Out: The RCA out can be used with any input on CH2. The most
common use is to convert a 1/8” Stereo Headphone signal to RCA line level.
FRONT PANEL
r o M a t c h M U B
-10 OUT Stereo RCA jacks: For connection to the input of a consumer level
device such as a cassette or CD player.
-10 IN Stereo RCA jacks: For connection to the output of a consumer level
device such as a cassette or CD player.
LEVEL 1: Adjusts the signal level of channel one, or the +4 dB IN to -10 dB
OUT channel.
h o M a t c M
LEVEL 2: Adjusts the signal level of channel two, or the -10 dB IN to +4 dB
OUT channel.
1/8” Stereo input: For connection to the output of a headphone level such as
a computers headphone output or mixers headphone output.
PWR LED: Indicates that power is applied to the MB35.
12 VDC jack: For connection to the Rolls PS27 12 Volt DC power supply.
The outside of the jack (barrel) is positive, the inside is negative.
USB: The USB input is CH1 in XLR’s. The USB output is CH2 out - XLR or
RCA’s.
IMPORTANT USB NOTE:
MB35 PROMATCH USB
The MB35 converts stereo consumer level signals to
professional line level signals - and vice versa.
It may also serve as a balanced inline level control by
patching the four RCA jacks together.
- Stereo Direct Box
When connecting the USB, your computer should recognize the
connection. We offer no support for using or setting up the USB, or
interfacing with applications. Please contact your dealer reguarding
these issues.
CONSUMER LEVEL VS PROFESSIONAL LEVEL
- Stereo RCA to stereo XLR
- Stereo Level control for each channel
- Works as stereo balanced line level control
- 1/8” Headphone level to line level adaptor
The purpose of the MB35 is to connect consumer level equipment
to professional level equipment. An explanation of these are ad-
dressed here.
Consumer level signals typically come from devices such as cam-
corders, cassette decks, CD or MP3 players, and home video play-
ers. Professional level signals are associated with devices found
in recording studios and sound reinforcement systems like mixing
boards, signal processors, and their associated amplifiers.
SPECIFICATIONS
Max Out:
Bal: +18 dB
Unbal: +12 dB
Bal: +22 dB
Max In:
Unbal: +22 dB
SCHEMATIC
Input Impedance:
RCA : 100k Ohm
XLR: 10 k Ohm
1/8” stereo: 10k Ohm
RCA: 100 Ohm
XLR: 100 Ohm balanced
-88 dB
+4 dB In: -8 dB
-10 dB In: + 20 dB
.003%
+VB
R4
10K 1%
C2
1U
+12
R2
10.0K 1%
4560
U1B
USB IN RED
J1
Output Impedance:
5
6
C13
R24
10K
7
RCAX4
J6C
C1 1U
3
1U P1A
P100K X2
2
4
LEFT OUT
R1
10.0K 1%
100
XLR
F
PC
R3
10K 1%
R18
R13
47
+VB
C8
47U
R8
10K 1%
Noise Floor:
Gain:
+4 INPUTS
C4
1U
-10 OUTS
R14 10K
+12
R7
2
1
4560
USB IN BROWN
J4
3
2
C14
10.0K 1%
R26
10K
1
RCAX4
J6D
R15
47
C9
47U
U1A
C3
3
J3
R12
10K
1U
5
5
RCAX2 XLR JACK
3
M
4560
P1B
1U
XLR
F
PC
R6
10.0K 1%
RIGHT OUT
6
5
R25
100
J8B
LINE OUTS
P100K X2
7
U2B
R11
47K
THD:
R5
10K 1%
+VB
J7
3.5STJK
BLACK
USB OUT
C17
1U
P2A
P100K X2
Power:
Weight:
Size:
12 VDC adapter (center negative)
1 lbs. (.45 Kg)
4.15” x 2.46” x 1.55”
3
1
C16
C5
1U
R11
RCAX4
J6B
4.7K
R18
C11
47U
120PF
2
2
47
R20
LEFT IN
1
4.7K
U2A
3
+4 OUTS
1
C18
1U
R10
47K
R16
10K
4560
2
+VB
-10 INPUTS/HDPHN IN
R9
47
R19
10K
C12
47U
P2B
P100K X2
+12
J2
1
6
4
XLR JACK
M
RIGHT IN
RCAX2
4560
C15
4.7K
R17
J6A
RCAX4
6
5
1
C6
1U
C20
J8A
7
U3B
120PF
1
R10
47K
R28
4.7K
WHITE
USB OUT
2
4560
+VB
U3A
1U
3
GREEN
USB GND
+12
BLUE
MB15b has NO usb function
USB PWR N/C
PWR
D2
6
5
D1
1N4001
R21
18K
+VB
R22
22K
LDRR
75889 00350
C10
47U
+12
J5
ROLLS CORPORATION
2
3
1
14
-
24 VDC
5968
S
350
W
C19
.047
TIP NEG
BARRELL POS.
R23
4.7K
MURRAY, UT
84107
Rolls Corporation
Salt Lake City, UT
07/08
JAPDC
PROMATCH II MB15b/MB35
Document Number:
C7
1K UF
Size:
Date:
Rev:
A
Ba
MB35.SCH
14 March 2008
Sheet
1
of
1
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