INTRODUCTION

Thank you for your purchase of the ROLLS RDB104 Quad Active Direct Box. The

RDB104 is an active impedance matching device with the added benefit of a

variable level control. Its four channel design is ideal for a variety of applications

including musicians, studios, and sound contractors. It is designed and manufac-

tured carefully to provide years of long-lasting service. Please read the following

manual carefully to ensure proper operation, and enjoy your new RDB104.

INSPECTION

1. Unpack and inspect the RDB104 box and package.

If obvious physical damage is noticed, contact the carrier immediately to make a

damage claim. We suggest saving the shipping carton and packing materials for

safely transporting the unit in the future.

2. Please complete the Warranty Registration Card and return it to the factory.

SCHEMATIC

DESCRIPTION

FRONT PANEL

NOTE: CHANNEL ONE THROUGH FOUR DESCRIPTIONS ARE IDENTICAL.

INPUT: 1/4” unbalanced jack for connection to an unbalanced, usually line-level,

signal.

LEVEL: Varies the amount of input signal from -infinity (off) to 0 dB.

POWER LED: Indicates the RDB104 is connected toi an AC outlet and power is

applied.

POWER SWITCH: Applies power to the RDB104 when connected to an AC outlet.

LEVELLEVEL
LEVEL
LEVEL
-00 0
POWER
INPUT INPUT INPUT INPUT
QUAD
ACTIVE
DIRECT BOX
RDB104
CHANNEL ONE CHANNEL TWO CHANNEL THREE CHANNEL FOUR
-00 0 -00 0 -00 0

REAR PANEL

NOTE: CHANNEL ONE THROUGH FOUR DESCRIPTIONS ARE IDENTICAL.

GND LIFT: Separates pin one of the XLR connector from the circuit ground.

OUTPUT: Balanced XLR jack containing the output signal. Pin 2 is “hot”.

30 dB PAD: Pressing this switch in lowers or “pads” the output signal b y 30 dB.

this provides a way to connect the output of the RDB104 to a mic input on a mixer.

INPUT: 1/4” unbalanced jack (parallels the front-panel Input jack.)

CHANNEL FOUR CHANNEL THREE CHANNEL TWO CHANNEL ONE
-30 dB
PAD
OUTPUT INPUT
GND
LIFT
OUTPUT INPUT OUTPUT INPUT OUTPUT INPUT
WARNING:
DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE.
NO USER SERVICABLE PARTS INSIDE.
120 VAC
50/60 Hz 15 VA
MODEL RDB104
MADE IN U.S.A.
SERIAL NUMBER
104-
RISQUE DE CHOC - NE PAS ENLEVER
RISK OF ELECTRIC SHOCK
NRTL /C
-30 dB
PAD
GND
LIFT GND
LIFT -30 dB
PAD
GND
LIFT
-30 dB
PAD

BLOCK DIAGRAM

The diagram shown below represents one channel of the RDB104. All channels

are identical.

LEVEL

INPUT

OUTPUT

2

Output
Buffer

30dB

PAD

SWITCH

GROUND

LIFT

ROLLS CORPORATION5968 South 350 WestSalt Lake City, UT 84107RDB104.SCH Rev:Sheet: 1 of 1Ba
AT T E N U A T O R
FR O N T
R E A R
AT T E N U A T O R
FR O N T
R E A R
AT T E N U A T O R
FR O N T
R E A R
AT T E N U A T O R
FR O N T
R E A R
CH1
CH2
CH3
CH4
PO W E R
+V
-V
+V
+V
+V
+V
-V
-V
-V
-V
30 Db PA D
30 Db PA D
30 Db PA D
30 Db PA D
C 2 5
47 U
SW 2
SW S PS T
PL 1
PL UG A C M A LE
D 1 3
1N 40 0 1
D 1 4
1N 40 0 1
D 1 5
1N 40 0 1
D 1 6
1N 40 0 1
C 2 4
1U
D 1 2
LD SG
T1
M CI 407 40 24
R 1
10 K
R 2 1
10 K
R 3 1
10 K
R 4 1
10 K
P1
P1 0 0 K
P2
P1 0 0 K
P3
P1 0 0 K
P4
P1 0 0 K
J1
PH O NE 1/4
J2
PH O NE 1/4
2
31
4
U 1 A
45 6 0
6
57
8
45 6 0
2
31
4
U 2 A
45 6 0
6
57
8
45 6 0
2
31
4
U 3 A
45 6 0
6
57
8
45 6 0
2
31
4
U 4 A
45 6 0
6
57
8
45 6 0
J4
PH O NE 1/4
J5
PH O NE 1/4
J7
PH O NE 1/4
J8
PH O NE 1/4
J1 0
PH O NE 1/4
J1 1
PH O NE 1/4
R 3
R 7
47
R 9
1K
R 8
R 2 8 R 2 9
1K
R 3 8 R 3 9
1K
R 4 8 R 4 9
1K
R 1 2
4. 7 K
I
2
G1O3
U 6
79 1 2
I
1
G2O3
U 5
78 1 2
C 1 50 3
R 4
R 2 7
47
R 3 7
47
R 4 7
47
R 4 6
1K
R 4 5
1K
R 3 6
1K
R 3 5
1K
R 2 6
1K
R 2 5
1K
R 5
1K
R 6
1K
12
3
SW 1 A
D PD T
12
3
SW 3 A
D PD T
12
3
SW 5 A
D PD T
12
3
SW 7 A
D PD T
3
12
SW 2
SP S T
3
12
SW 4
SP S T
3
12
SW 6
SP S T
3
12
SW 8
SP S T
1 2
3
J3
XL R JA CK M
1 2
3
J6
XL R JA CK M
1 2
3
J9
XL R JA CK M
1 2
3
J1 2
XL R JA CK M
G RO UN D LIF T
G RO UN D LIF T
G RO UN D LIF T
G RO UN D LIF T
10 0 K
10 K
U 1 B
10 K
10 0 K
R 2 4
10 K
R 3 4
10 K
10 0 K
U 3 B
R 3 3
10 K
10 0 K
R 4 4
10 K
U 4 B
R 4 3
10 K
C 1 7
50 3
C 1 9
50 3
10 00 UF 16 V
10 00 UF 16 V
C 2 2
C 2 3
C 2 0
50 3
C 2 1
50 3
TITLE: RDB104 QUAD DIRECT BOXSize Document Number:Date: 17-Aug-2000