Rolls DB325 Users Manual

INTRODUCTION:

DB325 is an instrument active (powered) direct box.
It is designed to take a guitar, bass or keyboard and
plug it directly into a computer, laptop or tablet. It
can also be used to boost the signal of an instrument
to be plugged in to just about anything. It is a cleanly
designed simple, high end all class A way to get your
instrument into di erent devices. Works great with
piezo pickups. It will also work to add more gain to
you guitar tube amp.

Instrument preamp/Interface.
... Anywhere you need a professional, clean

- Broadcast

- Live

- Studio

DB325 Instrument FET Preamp

DESCRIPTION/OPERATION:

pwr: Indicates the DB325 is on, or that the battery is
low when dim or o . There is no power switch for the

DB325. The 1/4” input jack serves as the power switch.
When a MONO jack is plugged into the INPUT of the
DB325 the unit automatically turns on. When the jack
is removed the unit turns o .

lift/gnd: Switch for connecting or disconnecting the
XLR ground (pin 1) to chassis ground. The GND LIFT
is only for the XLR jack it does not lift other input or
output grounds.

1/4” INPUT: UN-balanced (MONO) jack for connection
to an instrument. The input must be a 1/4” MONO jack

if a stereo jack is used the unit WILL NOT POWER ON.

BATTERY: Compartment for a single 9 Volt (alkaline
preferred) battery. NOTE: The battery does not need
to be removed when using the provided PS27s adapt­er. Expected battery life is between 10 to 30 hours

(Depending on demand usage)

DB325 Instrument FET Preamp-D I

• Mono 1/4" Input with level control.

• 3.5mm (Stereo) and 1/4” (MONO) outputs.

• XLR Transformer Balanced output.

• 9V Battery or Included AC adapter operation.

• Lots of output level, it's loud.

•Class A Design no feedback.

DB325

DB325

DB325

9 - 15 VDC: For connection to the provided Rolls PS27s

power adapter.

OUTPUTS:

-One 1/4” MONO (TS-Signal and Ground) output. Line

Level.

-One 1/8” Stereo (TRS-Left, Right and Ground) output.

Line level.

-One XLR Transformer balanced output jack.Mic Level.

All jacks can be used at the same time.

LEVEL: Adjusts the level of signal coming from the 1/4”
INPUT.

The DB325 also ships with pre drilled holes in the bot­tom to accept a belt clip (Rolls BC17). This item can be
purchased separately and attached to the bottom of
the DB325.

WARRANTY
For information on the Rolls One Year Limited Warranty, and
to register this product, visit our website at www.rolls.com

SPECIFICATIONS

Input Impedance : 4 Meg Ohms
Frequency Response: 20 - 20kHz +/- 3 dB
Output Impedance: 1K (XLR 600 Ohms)
Max Output Level: +8 dBm (XLR -12 dBm)
Max Input Level: -13dB
Gain: 20 dB, (XLR 0 dB)
Signal To Noise: 106 dB
THD: < .570%
Connectors: 1; XLR Female
1; 1/8" (3.5mm) TRS
2 ea; 1/4" TS

Weight: 1.1 lbs.
Dimensions: 4" w x 1.625" h x 3.5" d

DB325 Instrument Preamp

Rolls Corporation
Salt Lake City, UT
03/14

75889 032 50

65

DB325 Active FET Direct Box

XLR

GND-LIFT

1/4”

MONO

www.rolls.com

DB325

Instrument FET Preamp-DI

MONO INSTRUMENT INPUT

BATTERY - 9V

BATTERY

LIFT TO WITHDRAW

3.5mm

OUTPUTS

LEVEL

STEREOBALANCED OUT

9-15

VDC

The Rolls DB325 is an active direct
box designed to get an instru­ment in to your laptop, smart
phone or tablet. It is powered by
a 9 volt battery, or the supplied
DC adapter.

pwr

1/4”