Marshall Amplification DRP 1 User Manual

Direct  
Recording  
Pre-Amp  
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.  
Front Panel.  
DRP-1 Direct Recording  
Pre-am p.  
1. Pre-Am p Volum e.  
Controls the level of input gain. Lower levels  
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  
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.  
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.  
2. Master Volum e.  
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.  
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.  
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.  
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.  
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.  
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.  
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).  
3
passed onto other externally connected equipment,  
any channel faders etc. should be down when  
inserting the headphone jack.  
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.  
Note!  
Low battery levels will produce no light from  
the LED, whilst borderline power will produce  
only a dim output.  
Due to the widely varying nature of  
headphones, undesired clipping of the headphone  
amplifier may occur and will produce harsh  
distortion.  
Rear Panel.  
To control this simply reduce the line level  
until a satisfactory tone is achieved.  
9. Input J ack.  
Accepts the input from the guitar.  
10. D.C. Input.  
Accepts 9V DC power from a regulated  
power supply.  
11. Pre-am p 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 J ack.  
15. Battery Com partm ent (Located in  
the base of the unit).  
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.  
Finger removable cover gives easy access to  
the battery compartment for the 9V PP3 or  
equivalent type battery.  
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.  
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.  
13. Headphone Am p Input J ack.  
Using an external power supply will switch  
out the battery, but the DRP-1 is still turned on/off  
by the guitar 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.  
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.  
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 Am p Output J ack.  
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  
4
Som e Suggested  
Set-ups  
Headphone/ practice am p.  
Rem em ber that pedal type  
effects can be added between  
the guitar and input of the  
DRP-1 as you would with a  
norm al guitar am p.  
When recording it is  
recom m ended that effects are  
added at the m ix stage as is  
usually the case when  
recording a standard guitar  
am p.  
Live sound pre-am p.  
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.  
Recording em ulator or live P.A.  
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.  
5
GUITAR  
INPUT JACK  
INPUT  
AMP  
PREAMP  
VOL.  
GAIN  
AMP  
TONE  
DRIVER  
PASSIVE  
TONE  
MASTER  
VOL.  
PREAMP  
OUT  
PREAMP  
OUT  
BUFFER  
JACK  
BASS MID. TREBLE.  
ON  
OFF  
POWER  
AMP  
SIMULATOR  
LOUDSPEAKER  
CABINET  
SIMULATOR  
LINE  
LEVEL  
LINE  
OUT  
JACK  
POWER  
SWITCH  
BATTERY  
TEST  
L.E.D.  
BOOST  
SWITCH  
Front Panel.  
7.  
8.  
Pre a m p  
Volum e  
Ma ste r  
Volum e  
Ba ss  
Mid d le  
Tre b le  
Line  
Le ve l  
HEADPHONE AMP  
INPUT JACK  
HEADPHONE AMP  
INPUT JACK  
HEADPHONE  
AMP  
Ga in  
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Rear Panel. 1.  
2.  
3.  
4.  
5.  
6.  
+9v  
He a d p hone He a d p hone  
Line Out  
Pre -a m p  
Out  
DC Inp ut  
Inp ut  
Out  
In  
14.  
13.  
12.  
11.  
10.  
9.  
6
7

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