INTRODUCTION
Thank you for your purchase of the MB15 ProMatch Stereo Dual Con-
verter. Specifically, the MB15 converts consumer level stereo RCA signals
to balanced XLR professional line level - and back.
One side of the unit, labeled 1, has two XLR inputs and a stereo RCA
output. The other side, labeled 2, has stereo RCA inputs and two XLR
outputs.
Each side has a level control, and a front panel LED indicates when the
unit is on.
DESCRIPTION
REAR PANEL
+4 dB IN LEFT and RIGHT XLR jacks: Female XLR jacks to be con-
nected 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 con-
nected to the input of a professional line-level device such as a mixer or
recording device.
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.
PWR LED: Indicates that power is applied to the MB15.
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 MB15 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 amplifiers.
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
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 150 mA adapter (center negative)
Weight: 1 lbs. (.45 Kg)
Size: 4.15" x 2.46" x 1.55"
SCHEMATIC
1
ROLLS CORPORATION
5968 S 350 W
MURRAY, UT 84107
1
MB15.SCH A
30 SEPTEMBER 2002
Size: Document Number:
Date:
Rev:
Sheet of
PROMATCH MB15
Ba
+VB
+12
14 - 24 VDC
TIP NEG
BARRELL POS.
PWR
+VB
+VB
+VB
+VB
+VB
+VB
+VB
+VB
LEFT OUT
RIGHT OUT
+4 INPUTS
LEFT IN
RIGHT IN
-10 INPUTS
+12
+12
+12
+4 OUTS
-10 OUTS
2
3
1
J5
JAPDC
R23
4.7K
D2
LDRR
C7
1K UF
C10
47U
R22
10K
R21
10K
1 2
3
J1
XLR F PC
5
6
7
8
U1B
4560
3
2
1
4
U1A
4560
4
6
J6C
RCAX4
5
8
J6D
RCAX4
2
7
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
C16
.047
C15
.047
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
10K
R10
47K
2
3
1
4
U3A
4560
R18
47K
R17
10K
6
5
7
8
U3B
4560
R9
47
R20
47
R16
10K
R19
10K
C11
47U
C12
47U
D1
1N4001
R3
4.99K 1%
R4
4.99K 1%
R8
4.99K 1%
R5
4.99K 1%
1 2
3
J2
XLR JACK M
1 2
3
J3
XLR JACK M
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