MB15b ProMatch
Rolls Corporation
Salt Lake City, UT
07/08
- Studio
- Install
- Broadcast
... anywhere you need to convert consumer-
level audio to pro-level and/or vice-versa.
SCHEMATIC
MB15b
P
RO
M
ATCH
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
MB15b Pr
oMatch
MB15b Pr
oMatch
MB15b Pr
oMatch
Thank you for your purchase of the MB15b ProMatch Stereo Dual Con-
verter. 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.
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
-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.
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:
12 VDC adapter (center negative)
Weight:
1 lbs. (.45 Kg)
Size:
4.15” x 2.46” x 1.55”
www.rolls.com
1
ROLLS CORPORATION
5968 S 350 W
MURRAY, UT
84107
1
MB35.SCH
A
14 March 2008
Size:
Document Number:
Date:
Rev:
Sheet
of
PROMATCH II MB15b/MB35
Ba
+VB
+12
14 - 24 VDC
TIP NEG
BARRELL POS.
PWR
+VB
+VB
+VB
+VB
+VB
LEFT OUT
RIGHT OUT
+4 INPUTS
LEFT IN
RIGHT IN
-10 INPUTS/HDPHN IN
+12
+12
+12
+4 OUTS
-10 OUTS
2
3
1
J5
JAPDC
R23
4.7K
D2
LDRR
C7
1K UF
C10
47U
R22
22K
R21
18K
1
2
3
J1
XLR F PC
5
6
7
8
U1B
4560
3
2
1
4
U1A
4560
4
6
J6C
RCAX4
5
6
J6D
RCAX4
2
3
J6B
RCAX4
1
3
J6A
RCAX4
R1
10.0K 1%
C1
1U
C2
1U
R2
10.0K 1%
C13
1U
1
3
2
P1A
P100K X2
4
6
5
P1B
P100K X2
C4
1U
1
2
3
J4
XLR F PC
C14
1U
R7
10.0K 1%
R6
10.0K 1%
C3
1U
1
3
2
P2A
P100K X2
4
6
5
P2B
P100K X2
2
3
1
4
U2A
4560
6
5
7
8
U2B
4560
C8
47U
R13
47
C9
47U
R12
10K
R14
10K
R15
47
R11
4.7K
R10
47K
2
3
1
4
U3A
4560
R174.7K
6
5
7
8
U3B
4560
R9
47
R20
47
R16
10K
R19
10K
C11
47U
C12
47U
D1
1N4001
R3
10K 1%
R4
10K 1%
R8
10K 1%
R5
10K 1%
1
2
3
J2
XLR JACK M
1
2
3
J3
XLR JACK M
R25
100
R18
100
R26
10K
R24
10K
USB IN
USB IN
C18 1U
C5
1U
C6 1U
J7
3.5STJK
3
2
J8B
RCAX2
1
2
J8A
RCAX2
LINE OUTS
USB OUT
USB OUT
R18 4.7K
R28 4.7K
C20
1U
C17
1U
BROWN
RED
BLACK
WHITE
GREEN
BLUE
N/C
USB GND
USB PWR
+12
C19
.047
C15
120PF
C16
120PF
R11
47K
R10
47K
MB15b has NO usb function
CONSUMER LEVEL VS PROFESSIONAL LEVEL
The purpose of the MB15b is to connect consumer level equip-
ment 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 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 amplifi ers.
MB15b PROMATCH
6
75889 00150
0
