Rolls DB24 User Manual
DB24
Stereo Direct Interface
DB24 Stereo Direct Interface
- Two channel, transformer isolation device
- Passive - no power required
- Stereo RCA, 1/8" (3.5mm), and dual 1/4 Inputs
- Balanced XLR Outputs
- Individual variable attenuators
The DB24 is an ideal impedance matching device for connecting any
unbalanced stereo signal to a balanced system. Consumer audio equipment such as CD players, DVD players, MP3 players, etc., may be easily
connected to a professional audio system.
Rolls Corporation
Salt Lake City, UT
07/10
mono
stereo
LEFT
OUT
MADE IN USA
www.rolls.com
RIGHT
OUT
Stereo
gnd
lift
Direct
Interface
DB24
IN
RIGHT
LEVEL
DB24
-35
-50
-60 -20
Right
Level
RIGHT
MONO
INPUT
-25
LEFT
STEREO
INPUT
L. Ster R. Mon
LEFT
LEVEL
-35
-50
-60 -20
Left
Level
STEREO
-25
RCA
INPUT
STEREO
INPUT
L
R
St.
SPECIFICATIONS
Input Impedance : 20k - 600 Ohms
Frequency Response: 50 - 15kHz +/- 3 dB
Output Impedance: 600 Ohms
Max Output Level: +4 dBm
Connectors: 2 ea; XLR Male, 1; Stereo RCA,
1; 1/8" (3.5mm) TRS, 2 ea; 1/4" TRS
Controls: 2 ea; Variable attenuators, 2 ea; Ground Lift
switches
Weight: 1.5 lbs.
Dimensions: 3.42" w x 1.45" h x 3.325" d
Quick Start Guide
INTRODUCTION
Thank you for purchasing the DB24 Stereo Direct Interface. This sturdy device is
designed and manufactured to the most demanding specifi cations in order to provide
years of faithful survice. The DB24 converts high impedance audio signals to low
impedance via Rolls proprietary audio transformers, and a variety of inputs.
DESCRIPTION
FRONT PANEL
CONNECTION / OPERATION
1/4" Jacks: Stereo Operation:
A. Individual Right and Left connections - Connect Tip-Sleeve 1/4" plugs to the
Right and Left Input jacks.
B. Stereo Tip-Ring-Sleeve connection - Connect a Tip-Ring-Sleeve 1/4" plug to
the Left/Stereo Input jack. IMPORTANT NOTE: Connecting a Tip-Sleeve MONO
plug into this jack, with nothing connected to the Right/Mono Input will
result in the Right/Mono Input being shorted to ground.
St.
IN
DB24
-35
-50
-60 -20
Right
Level
-25
-35
-50
-25
-60 -20
Left
L. Ster R. Mon
Level
- L.Ster: 1/4" Tip-Ring-Sleeve jack for connection to a "Left" portion of a signal, or
a Tip-Ring-Sleeve "Stereo" signal.
- Left Level: Adjusts the input level to the Left channel.
- L & R: Stereo RCA jacks, for connection to an unbalanced stereo signal. Note:
The Right and Left jacks may be used individually as well.
NOTE: The Red RCA jack connects to the Right Out, and the White RCA jack
connects to the Left Out.
- St. IN: 1/8" (3.5mm) Tip-Ring-Sleeve jack for connection to an unbalanced Stereo
signal only.
- Right Level: Adjusts the input level to the Right channel.
- R. Mon: 1/4" Tip Sleeve jack for connection to the "Right" portion of a stereo
signal, or to a "Mono" signal.
REAR PANEL
mono
stereo
LEFT
OUT
RIGHT
OUT
gnd
lift
-
- Stereo/Mono When in stereo the units left and right are separet. When in Mono
The left and right inputs are combined together. In mono mode you can plug a single
left or right input into the DB24 and you will get output from both left and right.
- Ground Lift (Labeled "gnd/lift"): When positioned to the side of the switch labeled
"lift", the shield of the XLR plug is separated from the ground pin (pin 1).
- Left/Right OUT: Balanced XLR jacks - for connection to mixer inputs, amplifi ers,
etc. This will effect both left and right channels.
1/4" Jack: Mono Operation: Connect a Tip-Sleeve Mono plug to the Right/Mono
Input.
1/8" (3.5mm) Jack: Connect a Tip-Ring-Sleeve stereo plug into this jack for stereo
operation only. NOTE: Connecting a Tip-Sleeve MONO plug into this jack, with
nothing connected to the Right/Mono 1/4" Input will result in the Right/Mono
Input being shorted to ground.
RCA Jacks: Connect Stereo RCA plugs into these jacks for stereo or dual-mono
operation.
Connect XLR outputs to the next device in your signal chain.
Adjust the Right and Left Level controls for an appropriate input level. For example, for maximum amount of attenuation (least amount of signal), turn the Level
control to -60. For minimum attenuation (maximum signal), turn the Level control
up to -20.
SCHEMATIC
J3
EFT/STEREO
J4A
RCAX2 PC
INPUTS
J5
IGHT/MONO
PHONE 1/4
3
JK3.5ST
J6
PHONE 1/4
2
1
P100K
P100K
P1
R5 470
R1
10K
R2
1K
R3
1K
312
SPST
SW1
MONO/STEREO
P2
R6 470
20K X 600 ohm
R4
10K
Rolls Corp oration
DB24 STEREO DIRECT INTERFACE
Document Number:
Ba
25 JUNE 2010
Date:
TR1
3
PN829
J1
XLR JACK M
TR2
PN829
XLR JACK M
GROUND/LIFT
5968 So 350 West
Murray Utah 84107
1 2
3
J2
1 2
312
DB24.SCH A
OUTPUT
SW2
SPST
Sheet of
Rev:
1
1
Loading...