Rolls ADB2 Users Manual
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be free
from defects in materials and workmanship under normal installation, use and
service for a period of one (1) year from the date of purchase as shown on the
purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be limited
to repair or replacement (at our option), during the warranty period of any part
which proves defective in material or workmanship under normal installation,
use and service, provided the product is returned to Rolls Corporation, TRANSPORTATION CHARGES PREPAID. Products returned to us or to an authorized
Service Center must be accompanied by a copy of the purchase receipt. In the
absence of such purchase receipt, the warranty period shall be one (1) year from
the date of manufacture.
This warranty shall be invalid if the product is damaged as a result of
defacement, misuse, abuse, neglect, accident, destruction or alteration of the
serial number, improper electrical voltages or currents, repair, alteration or
maintenance by any person or party other than our own service facility or an
authorized Service Center, or any use violative of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties, obligations
or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR LIABILITIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,
SHALL BE LIMITED IN DURATION TO THE ONE YEAR DURATION OF
THIS WRITTEN LIMITED WARRANTY. Some states do not allow limitations
on how long an implied warranty lasts, so the above limitation may not apply to
you.
BE LIABLE FOR ANY SPECIAL,
INCIDENTAL OR CONSEQUENTIAL
DAMAGES FOR BREACH OF THIS
OR ANY OTHER WARRANTY,
EXPRESSED OR IMPLIED, WHATSOEVER. Some states do not allow the
exclusion or limitation of special,
incidental or consequential damages so
the above limitation or exclusion may
not apply to you. This warranty gives
you specific legal rights, and you may
also have other rights which vary from
state to state.
IN NO EVENT SHALL WE
ADB2 Active Direct Box
• Uses standard 9 - 48 volt
phantom power for supply
• Ground Lift for "hum" reduction
• Attenuator switch for connection to line level or speaker level
signals
The ADB2 is an active direct box for
converting a high impedance signal
such as a direct out from a bass
amplifier, to a low impedance signal
such as a snake input and a mixer's
microphone input. The Ground Lift is
provided to reduce possible ground
hum or buzz.
ADB2
PHANTOM
Direct Box
PHANTOM
INPUT
ATTENUATOR
0 dB
DIRECT BOX
-40 dB
-20 dB
ADB2
GROUND LIFT
GND LIFT
OUTPUT
Rolls Corporation
Salt Lake City, UT
9/95
Owners Manual
Congratulations and thank y ou for your purchase of the ADB2 Phantom.
The ADB2 is designed to provide lasting value and usefulness. It is
intended for sending unbalanced signals (up to +40 dB) to a mixing
console or other professional input device. The unit has no transformer,
so stray field pickup is nonexistent. The ADB2 is powered by standard
microphone phantom power from 9 - 48 VDC and uses discrete low-noise
differential dri vers to make it very quiet. The unit has two 1/4" input jacks
wired in parallel, a male XLR output jack, a ground lift switch, and a threeposition attenuator switch.
DESCRIPTION
INPUTS: Two 1/4" unbalanced jacks - wired together in parallel. For
connection to line or instrument level signals.
OUTPUT: One male XLR jack for connection to mixing console or other
input device carrying phantom pow er .
ATTENU ATOR SWITCH: Decreases the input signal by the indicated
amount. At 0 dB the signal is not attenuated, at the 20 and 40 dB settings,
the signal is dropped by that amount.
GROUND LIFT: Removes the ground connection of the 1/4" and XLR
jacks from the chassis ground.
INSTALLATION
In order for the ADB2 to function it must be connected to a microphone
phantom power source with a balanced XLR cord. The input may be
anything from a speaker source such as a music amplifier, VCR or
projector, to an instrument such as a guitar or High-impedance microphone. Care should be taken to overdrive the ADB2 or there will be a
distorted sound from the unit. Use the low est attenuator setting that gives
distortion free sound. The ground lift switch should be in the position that
yields the low est noise.
SPECIFICATIONS
Input Level: -10 to +40 dB unbalanced
Output Level: -10 to +2 dB balanced XLR Male (pin 2 +)
Bandwidth: 1 Hz to 50 kHz
S/N Ratio: 100 dB
Jacks: (2) 1/4" phone, (1) XLR male
Conrols: Attenuator switch, Ground Lift switch,
Power: 9 - 48 VDC Phantom Powered
Size: 2" x 3.5" x 5"
J1
PC 1/4
J2
PC 1/4
R9
1M
SW1A
ALPHASW
ATTENUATOR
3
124
R7
100K
312
GROUND LIFT
SW2
SPST
R5
10K
6
SW1B
ALPHASW
875
R8
10K
Q2
PN4857
R3
1M
R2
3.3K
Q1
PN4857
R4
1M
R1
3.3K
R6
10K
2
J3
3
XLR M PC
1
INPUT
ATTENUATOR
0 dB
PHANTOM
DIRECT BOX
ADB2
-40 dB
-20 dB
OUTPUT
GROUND LIFT
GND LIFT
Title
Size Document Number REV
A ADB2.SCH B
Date: July 18, 1994 Sheet of
ROLLS CORPORATION
ADB2 PHANTOM DIRECT BOX
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