Rolls DB25 User 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.
IN NO EVENT SHALL
WE 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.
DB25 Matchbox
• Converts high-impedance to lowimpedance & vice-versa
• Ground Lift for "hum" reduction
• Attenuator switch for connection
to line level or speaker level
signals
The DB25 is a passive direct box
for con verting 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. Th e
Ground Lift is provided to reduce
possible ground hum or buzz.
IN
DB25
MATCHBOX
Direct Box
MATCHBOX
DB25
ATTENUATOR
0 dB
-40 dB
-20 dB
GROUND LIFT
GND
OUT
LIFT
Salt Lake City,
Utah 8/99
Owners Manual
INTRODUCTION
Thank you for your purchase of the DB 25 MATCHBOX, 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
40 dB, and a Ground Lift switch which may reduce unwanted
hum caused by "ground loops".
SPECIFICATIONS
Frequency Response: 50 - 15kHz +/- 3 dB
Output Impedance: 600 Ω
Input Impedance: 50K Ω
Max Output Level: +4 dBm
DESCRIPTION
Input Jacks: 1/4" unbalanced jacks for receiving line or instrument level signals.
Attenuator switch: Reduces the input signal by the amount
indicated.
Ground Lift Switch: In the "Lift" position, the ground connection of the XLR jack is disconnected from the chassis.
Output Jack: XLR balanced jack for connection to a mixing
board or other balanced input device.
MATCHBOX
IN
ATTENUATOR
0 dB
-40 dB
-20 dB
DB25
GROUND LIFT
GND
OUT
LIFT
J1
PHONE 1/4
SW1A
J2
PHONE 1/4
ALPHASW
4
0 Db
R1 10K
3
2
-20
1
-40
100K
R2
ALPHASW
5
7
8
R3
1K
EXAMPLE APPLICATIONS
0 dB Setting
ATTENUATOR
BASS GUITAR
SPEAKER OUTPUT
IN
0 dB
-40 dB Setting
ATTENUATOR
IN
SW1B
-20 dB
0 dB
-20 dB
T1
50K - 600 CT
6
SW2A
1
3
DPDT
Title
Size Document Number REV
A DB25.SCH
Date: December 22, 1992 Sheet of
MATCHBOX
DB25
OUT
GROUND LIFT
GND
-40 dB
LIFT
MATCHBOX
DB25
OUT
GROUND LIFT
GND
-40 dB
LIFT
ROLLS CORPORATION
DB25 MATCHBOX
MIXING BOARD
2
J3
3
2
LIFT
XLR M PC
1
AMPLIFIER
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