Rolls MB15b ProMatch Specifications

Thank you for your purchase of the MB15b ProMatch Stereo Dual Con­verter. Specifi cally, the MB15b 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.

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

- Broadcast

- Install

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 MB15b.
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.

CONSUMER LEVEL VS PROFESSIONAL LEVEL
The purpose of the MB15b 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 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.

MB15b PROMATCH

The MB15b 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

- Studio

MB15b ProMatch

MB15b ProMatch

MB15b ProMatch

MB15b ProMatch

SCHEMATIC

+VB

R4

10K 1%

C2
1U

J1

3

XLR F PC

1 2

+4 INPUTS

J4

XLR F PC

14 - 24 VDC
TIP NEG
BARRELL POS.

C4
1U

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

U1B

R3

10K 1%

4560

U1A

4

R5

10K 1%

RCAX4
J6B

J6A
RCAX4

WHITE
USB OUT

D1

C7

1K UF

USB IN

P1B

P100K X2

C17
1U

1U

1 3

4 6

BLACK

USB OUT

R10

+12

RED

R24

RCAX4

10K

J6C

4

2P1A

LEFT OUT
100
R18

6

-10 OUTS

USB IN

BROWN

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

+12
R12
10K

6
5

+VB

R16 10K

R19
10K

6
5

+VB

N/C

+12

C19
.047

C13

7

1U

P100K X2

C14

1

1U

C5
1U

2

C18

3

3

1

C6

1U

C20

1U

C10
47U

R13

47

R15

8

47

4560

J8B

7

U2B

LINE OUTS

47

R20

R9

+12

47

8

4560

J8A

7

U3B

MB15b has NO usb function

ROLLS CORPORATION

5968 S 350 W

MURRAY, UT 84107

PROMATCH II MB15b/MB35

Size: Document Number:

MB35.SCH A

Ba

Date:

14 March 2008

47U

RCAX2

C11
47U

RCAX2

SPECIFICATIONS

Max Out: Bal: +18 dB
Unbal: +12 dB
Max In: Bal: +22 dB
Unbal: +22 dB
Input Impedance: RCA : 100k Ohm

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

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:

12 VDC adapter (center negative)
Weight: 1 lbs. (.45 Kg)
Size: 4.15” x 2.46” x 1.55”

MB15b PROMATCH

Rev:

Sheet of

1

1

www.rolls.com

Rolls Corporation
Salt Lake City, UT
07/08

6

75889 00150

0