Rolls DB225 User Manual
INTRODUCTION
Thank you for your purchase of the DB225 Professional D-I. A
passive direct box designed to take high impedance signals and
convert them to low impedance. The unit features an attenuator
switch for padding the input signal by either 20 or 40dB, and the
ground lift switch may be used to reduce unwanted hum caused by
ground loops.
INSPECTION
1. Unpack and Inspect the DB225 package
Your DB225 was carefully packed at the factory in a protective
plastic clamshell package. Nonetheless, be sure to examine the
unit and the carton for any signs of damage that may have occurred
during shipping. 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
.
WARRANTY
For information on the Rolls One Year Limited Warranty, and
to register this product, visit our website at www.rolls.com
DESCRIPTION
... anywhere you need a professional D-I box
- Broadcast
- Live
- Studio
DB225 Professional Direct Interface
DB225
DB225
DB225
INPUT(S): 1/4” unbalanced jacks for receiving line or
instrument level signals
OUTPUT(S): XLR male and female for connection to a
mixer board or other balanced input device.
GROUND LIFT SWITCH: In the lift position, the
ground connection to the XLR jack is disconnected from the
chassis.
ATTENUATOR SWITCH: Reduces the input signal by
the amount indicated.
SCHEMATIC
ATTENUATOR
SW1A
ALPHASW
J1
PHONE 1/4
J2
PHONE 1/4
3
2
4
R1
R2
1M
100K
6
SW1B
ALPHASW
1
8
7
5
R3
10K
T?
XFMR AUDIO
Rolls Corporation
5968 So 350 West
Murray Utah 84107
Document Number:
Ba
Date:
19 May 2009
3
J3
XLR JACK M
GROUND LIFT
DB225 Direct Box
DB225.SCH 5199
1 2
312
SW2
SPST
Sheet of
1
Rev:
DB225 Professional
Direct box
-Converts high impedance to low impedance & vice-versa
-Ground lift for “hum” reduction
-Attenuator switch for getting the correct
level
The DB225 is a passive direct box for
converting high impedance signals to low
impedance and vica-versa.
SPECIFICATIONS:
Frequency response: 20 - 20kHz +/- 1 dB
Max Output level: +4 dBm
Input Impedance: 50K Ohms
Output Impedance: 600 Ohms.
Weight: 1 lbs. (.45 Kg)
Size: 4.15” x 2.46” x 1.55”
1
Rolls Corporation
07/09
75889 02250
66
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