Marshall Amplification DRP-1 User manual

Direct

Recording

Pre-Amp

DRP-1

FROM THE CHAIRMAN

I would like to thank you personally for selecting

one of our Direct Recording Pre-amps.

In our quest to make the sound of Marshall more

accessible, we constantly use the knowledge and

experience of our Research and Development team to

produce new products.

Following the success of the SE100 Speaker

Emulator and PB100 Power brake, we have now

produced the DRP-1 Direct Recording Pre-Amp.

A remarkable and compact device which is incredibly

versatile and which offers a true simulation of a

Marshall Stack for either recording or practice

purposes, plus pre-amp facilities if you wish to

extend your existing amp/ combo or drive a power

amp and cabinet set-up.

The full experience of the same design team that

produced the JCM 900, Anniversary and Valvestate

ranges has been brought to bear on the DRP-1.

This ensures that the sound quality, engineering

and construction are everything you would expect

from a product bearing the Marshall logo.

I wish you every success and above all, hope you

enjoy using your Direct Recording Pre-amp.

Sincerely,

ENGLISH

DRP-1 Direct Recording

Pre-amp.

The Marshall Direct Recording Pre-Amp

is in essence a complete Marshall stack in

miniature, despite it’s compact size the

DRP-1 uses micro electronic techniques to

emulate the tone and feel of a typical

Marshall pre-amp, power amp and

loudspeaker cabinet. This allows the

recording and reproducing of great guitar

sounds with the minimum of fuss and

without the need to set-up and mic your

normal guitar amp rig.

The benefits of the DRP-1 can be utilised

beyond the realms of the home studio.

For instance the built-in stereo headphone

amplifier can be coupled to your favourite

effects processor to give your personal

practice routines the realism of your stage

sound. Alternatively, use the DRP-1 plugged

into the front end of your normal guitar amp

to fully ‘Marshallize’ it.

Another use of the DRP-1 is to go direct

into the PA from the emulated line-out. This

is especially handy for rehearsal, where

instead of transporting your main system

along, you can turn up with the DRP-1 and

just plug in and play.

In addition to the guitar uses, the Direct

Recording Pre-Amp can be used to add

warmth and another dimension to keyboards,

especially when mixed with the original

sound.

Front Panel.

1. Pre-Amp Volume.

Controls the level of input gain. Lower levels

will produce cleaner sounds, whilst higher settings

will increase the distortion produced by the pre-

amp circuitry.

The boost switch (Item 7) provides two basic

gain levels comparable to classic and

contemporary Marshall amps.

2. Master Volume.

As in a true guitar amplifier the master

volume regulates the amount of signal passed

from the ‘pre-amp’ into the ‘power amp’ section.

The amount of drive passed through to the

power amp will influence the tone and overdrive

capabilities of the entire unit.

3,4 &5. Bass, Middle & Treble

controls.

The Middle and Treble controls are based on

the passive system found on most Marshall amps,

but have a wider sweep allowing you to re-create

many types of guitar amp sounds.

The active Bass control is designed not only

to interact with the Treble and Middle controls,

but also to emulate the resonant low end ‘Thump’

associated with a Marshall 4x12 cabinet.

6. Line Level.

Controls the output level from the Pre-Amp

Out jack (Pre Speaker Emulation), from the

Speaker Emulated Line Out jack and from the

Headphone Amp.

7. Boost/ Battery level switch.

Multi purpose switch that selects the two gain

parameters of the pre-amp and also a ‘momentary’

position to test the battery level in conjunction

with LED (Item 8).

WARNING!

PLEASE READ THE FOLLOWING LIST CAREFULLY

A. DO NOT attempt to remove the DRP-1 chassis. There are no user serviceable parts inside.

B. ALWAYS have this equipment serviced or repaired by competent, qualified personnel.

C. PLEASE READ this instruction manual carefully before switching on.

ENGLISH

8. Battery Level LED.

When activated by the switch (Item 7) the

LED will illuminate when there is sufficient

battery power to run the DRP-1.

Low battery levels will produce no light from

the LED, whilst borderline power will produce

only a dim output.

Rear Panel.

9. Input Jack.

Accepts the input from the guitar.

10. D.C. Input.

Accepts 9V DC power from a regulated

power supply.

11. Pre-amp Out jack.

A buffered output suitable for feeding a ‘live’

guitar system such as a separate power amp and

guitar speaker cabinet set-up.

12. Line Out Jack.

Provides the output from the ‘power amp/

loud speaker emulator’.This output should be used

when wanting to directly record a full guitar amp

simulation.

The Line Out socket would also be used to

feed the input of your effects processor when

using the DRP-1 for private practice through the

headphone amplifier, or to feed the input of a

normal guitar amp/ combo as an additional pre-

amp.

13. Headphone Amp Input Jack.

A stereo jack accessing the input to the

headphone amplifier which allows the insertion of

effects processors between the headphone amp

and the output of the emulator.

By connecting the left and the right outputs of

the processor to this socket using a stereo jack to

two mono jack Y lead, you can gain all the

benefits of your favourite effects through the

stereo headphones connected to socket 14.

14. Headphone Amp Output Jack.

A stereo 3.5 mm jack fed from the integrated

headphone amp, which will suit stereo headphones

from 32 to 600 Ohm impedance, for private

practice.

To maximise the life of the battery, the

headphone amp is only provided with power when

the headphones are fully connected to the socket.

To prevent the switching transient being

passed onto other externally connected equipment,

any channel faders etc. should be down when

inserting the headphone jack.

Note!Due to the widely varying nature of

headphones, undesired clipping of the headphone

amplifier may occur and will produce harsh

distortion.

To control this simply reduce the line level

until a satisfactory tone is achieved.

15. Battery Compartment (Located in

the base of the unit).

Finger removable cover gives easy access to

the battery compartment for the 9V PP3 or

equivalent type battery.

Note!The power to the DRP-1 is controlled by the

guitar input jack, therefore to preserve the battery

life the guitar lead should be removed when the

unit is not in use.

Using an external power supply will switch

out the battery, but the DRP-1 is still turned on/off

by the guitar input jack.

When unplugging the input jack, it is a wise

precaution to turn down any mixer or recorder

level controls to prevent any handling noise being

passed onto external equipment.

ENGLISH

MIX

Headphone/ practice amp.

Live sound pre-amp.

Recording emulator or live P.A.

Some Suggested

Set-ups

●Remember that pedal type

effects can be added between

the guitar and input of the

DRP-1 as you would with a

normal guitar amp.

●When recording it is

recommended that effects are

added at the mix stage as is

usually the case when

recording a standard guitar

amp.

FEATURE GUIDE

FX IN

Stereo input to take the left and right

returns from your effects processor (using

a stereo jack to 2x mono jack Y lead) when

using the DRP-1 as a headphone practice

amp only.

FX OUT

Filtered Line Out socket to feed the

input of your effects processor when using

the DRP-1 as a headphone practice amp

and controlled by the Line Out level

control.

HEADPHONES

Output for the connection of stereo

headphones for private practice sessions.

MIXER

Filtered Line Out featuring Marshall

emulation for direct connection to either

P.A. or recording mixers (May also be used

to drive the input of a normal guitar

combo).

POWER AMP

Direct pre-amp output to drive a power

amp and cabinet set up. Also provides an

unfiltered alternative output for direct

recording purposes -ideal for recording

bright ‘glassy’ clean sounds.

GUITAR

Input jack for the connection from the

guitar.

MIX

INPUT

AMP PREAMP

VOL. GAIN

AMP TONE

DRIVER PASSIVE

TONE MASTER

VOL. PREAMP

OUT

BUFFER

PREAMP

OUT

JACK

GUITAR

INPUT JACK

BOOST

SWITCH

BATTERY

TEST

L.E.D.

POWER

SWITCH

ON OFF

BASS MID. TREBLE.

POWER

AMP

SIMULATOR

HEADPHONE

AMP

HEADPHONE AMP

INPUT JACK HEADPHONE AMP

INPUT JACK

+9v

LINE

LEVEL LINE

OUT

JACK

LOUDSPEAKER

CABINET

SIMULATOR

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. . . . . . . . . . . .

Bass Middle Treble Line

Level

Battery Test

Normal

Boost

Master

Volume

Gain

Preamp

Volume

Headphone

Out Headphone

In Line Out Pre-amp

Out DC Input Input

1. 2. 3. 4. 5. 6.

7. 8.

14. 13. 12. 11. 10. 9.

Front Panel.

Rear Panel.

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