Rolls Satellite TV System ADB2 User Guide

Congratulations and thank you for your purchase of the ADB2 Active Direct Box. The  
ADB2 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 drivers 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 three-position attenuator switch.  
ADB2  
Active Direct Box  
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 power.  
ATTENUATOR 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.  
ACTIVE LED: Indicates the unit is receiving phantom power.  
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 lowest attenuator setting that gives  
distortion free sound. The ground lift switch should be in the position that yields the  
lowest noise.  
SPECIFICATIONS  
Input Level:  
Output Level:  
Bandwidth:  
S/N Ratio:  
Jacks:  
Controls:  
Power:  
-10 to +40 dB unbalanced  
-10 to +2 dB balanced XLR Male (pin 2 +)  
1 Hz to 50 kHz  
100 dB  
(2) 1/4" phone, (1) XLR male  
Attenuator switch, Ground Lift switch,  
9 - 48 VDC Phantom Powered  
2" x 3.5" x 5"  
WARRANTY  
For information on the Rolls One  
Year Limited Warranty, and to reg-  
ister this product, visit our website  
ADB2 Active Direct Box  
power for supply  
• Ground Lift for "hum" reduction  
• Attenuator switch for connection to line  
level or speaker level signals  
• Uses standard 9 - 48 volt phantom  
Size:  
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The ADB2 is an active direct box for convert-  
ing a high impedance signal such as a direct  
out from a bass amplifier, to a low imped-  
ance signal such as a snake input and a  
mixer's microphone input. The Ground Lift is  
provided to reduce possible ground hum or  
buzz.  
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ROLLS CORPORATION  
5968 South 350 West  
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Salt Lake City, UT 84107  
PHANTOM DIRECT BOX  
Rev:  
Size:  
Document Number:  
ADB2.SCH  
A
Ba  
Rolls Corporation  
Salt Lake City, UT  
3/01  
Date:29-Mar-2001  
Sheet 1 of  
1
Owners Manual  
 

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