Rolls MB35 User Manual

Thank you for your purchase of the MB35 ProMatch USB Stereo Dual Con­verter. Specifi cally, 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
product, see our web site at www.rolls.com.

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 reinforce­ment 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

-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.
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.

level audio to pro-level and/or vice-versa.
... anywhere you need to convert consumer-

- Broadcast

- Install

- Studio

MB35 ProMatch USB

MB35 ProMatch

MB35 ProMatch

MB35 ProMatch

IMPORTANT USB NOTE:

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

The purpose of the MB35 is to connect consumer level equipment
to professional level equipment. An explanation of these are ad­dressed here.
Consumer level signals typically come from devices such as cam­corders, cassette decks, CD or MP3 players, and home video play­ers. Professional level signals are associated with devices found
in recording studios and sound reinforcement systems like mixing
boards, signal processors, and their associated amplifi ers.

SCHEMATIC

+VB

R4

10K 1%

XLR F PC

+4 INPUTS

XLR F PC

14 - 24 VDC
TIP NEG
BARRELL POS.

C2
1U

J1

3

1 2

C4
1U

J4

3

1U

1 2

J5

JAPDC

R2

10.0K 1%

C1 1U

R1

10.0K 1%

+VB

R8

10K 1%

R7

10.0K 1%

C3

R6

10.0K 1%

J7

3.5STJK

-10 INPUTS/HDPHN IN

2
3
1

LEFT IN

5
6

3
2

RIGHT IN

1N4001

+12

8

4560

C13

7

U1B

1U

P100K X2

R3

10K 1%

4560

C14

1

U1A

1U

4

R5

10K 1%

C5

RCAX4

1U

J6B

2

C18

3

3

1

J6A

C6

1U

RCAX4

WHITE

C20

USB OUT

1U

D1

C10
47U

C7

1K UF

P1B

P100K X2

C17
1U

1U

1 3

4 6

BLACK

USB OUT

R10

+12

RED

USB IN

R24

RCAX4

10K

J6C

4

2P1A

LEFT OUT
100
R18

6

-10 OUTS

BROWN

USB IN

R26

RCAX4

10K

J6D

5

5

RIGHT OUT
R25
100

6

P2A
P100K X2

13

C16

R11

4.7K
2

120PF

2

R18

47K

R17
R28

R21
18K

R22
22K

1

4.7K

U2A

3

4560

+VB

4
P2B
P100K X2

46

C15

4.7K
5

120PF

4.7K
2

4560

1

U3A

3

GREEN

USB GND

4

BLUE

USB PWR

PWR

D2
LDRR

+VB

R23

4.7K

R14 10K

R12
10K

6
5

+VB

R19
10K

+VB

N/C

+12

C19
.047

R13

47

+12

8

4560

7

U2B

LINE OUTS

R20

R16 10K

+12

8

4560

6

7

U3B

5

MB15b has NO usb function

ROLLS CORPORATION

MURRAY, UT 84107

PROMATCH II MB15b/MB35

Size: Document Number:

Ba

MB35.SCH A

14 March 2008

Date:

R15
47

J8B

47

R9
47

J8A

5968 S 350 W

47U

RCAX2

C11
47U

RCAX2

C8

3

12

C9

J3

47U

XLR JACK M

3
R11

47K

2

3

+4 OUTS

12

C12

J2

47U

XLR JACK M
1
R10

47K

2

Rev:

1

Sheet of

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

- 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

SPECIFICATIONS

Max Out: Bal: +18 dB
Unbal: +12 dB
Max In: Bal: +22 dB
Unbal: +22 dB
Input Impedance: RCA : 100k Ohm
XLR: 10 k Ohm
1/8” stereo: 10k Ohm
Output Impedance: RCA: 100 Ohm
XLR: 100 Ohm balanced
Noise Floor: -88 dB
Gain: +4 dB In: -8 dB

-10 dB In: + 20 dB
THD: .003%
Power:
Weight: 1 lbs. (.45 Kg)
Size: 4.15” x 2.46” x 1.55”

www.rolls.com

Rolls Corporation

1

Salt Lake City, UT
07/08

12 VDC adapter (center negative)

6

75889 00350

5