Marshall electronic LR300, LR230, LR150 User Manual
LR150, LR230
& LR300
Linear Response Combos
AUDIOSTATE
ENGLISH
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From Jim Marshall
I would like to thank you personally for selecting
one of our Linear Response amplifiers.
From my early teens right up to the present day I
have spent the majority of my time around other
musicians. My own musical career started as a singer
and moved shortly afterwards into the world of
drumming. As well as playing drums professionally I
also taught a vast number of drummers, many of whom
went onto become professional drummers in their own
right.
I began building Marshall guitar amplifiers in 1962
and have been doing so ever since. Throughout this
time I have met many different musicians, of all levels
and of all abilities and not just guitarists. It is by
listening to these musicians that I have ensured that we
have continued to make the products that are needed
and it is by continuing to listen, that we always will.
As a direct result of this experience with musicians
in general, we have launched the Linear Response
Range. Though Marshall is normally associated with
dedicated guitar amps, in many circumstances a multipurpose amp is needed to allow a number of different
people to plug in different instruments and microphones
at once. The LR300, LR230 and LR150 are multipurpose, multi-input amps which can be used for just
about any instrument, (including guitar on the LR300
thanks to the inclusion of our acclaimed speaker
emulation circuitry).
You can rest assured that each Linear Response amp
comes with the reliability you would expect from
Marshall Amplification, plus a superb range of features
and of course, great tone.
I would like to wish you every success with all of
your musical endeavours and also your new Marshall
amp. I am sure that you will find it a pleasure to play
for many years to come.
Yours sincerely,
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Introduction
LR300
The Marshall LR300 is a combination of a 5 channel mono mixer, high quality 300
Watt RMS power amp with distortion reducing limiting circuit and a compact high
quality loudspeaker system, intended to provide a very versatile single unit solution
to all applications where linear stage amplification is required. Let us just take a
moment to understand what we mean by Linear Response. Linear response
essentially means getting out what we put in, only louder, without any undue
colouration, distortion, or undesired frequency changes, just as you would expect
from a good PA or HiFi system. Those qualities are desired in a guitar amp, for
instance, but NOT when you are amplifying keyboards, sound modules, pre-recorded
music or vocals. The LR300 allows you to do this with ease as it is self contained in
one package, rather than carrying around (and finding stage space for) the minimum
of three units that would make up a normal PA type set up.
The LR300’s 5 channels come equipped with a variety of input and sound forming
options, plus the power and sonic quality to enable many different live sound uses to
be performed. For instance, the LR300 can be used to mix and amplify up to 5
keyboards, sound modules and/or sequencers, as either a main system at club level
or as a monitor system on louder concert stages. Want to use a guitar as well? No
problem! With the inclusion of the reknowned Marshall loudspeaker emulation
system on channel 4, not only is great clean guitar sound possible, it also allows the
use of external distortion generating effects, i.e. stomp boxes or preamps, without the
sound being harsh and fizzy, unlike a normal PA system or mixer. Great for keyboard
players who double on guitar!
Besides the normal jack line inputs on all channels, channels 1 and 2 also feature
balanced XLR inputs for low impedance microphones for vocal or acoustic instrument
amplifying duties, plus channel 5 also has phono inputs for tape, CD, or even a
computer sound card! Channel 1 also features a dedicated series FX loop, so that you
can add specialised FX to that channel, i.e. how about a harmonizer on your vocals?
With so much versatility on tap the creative horizons of the LR300 are quite
boundless. For example, how about using it as a percussion monitor - miking and
mixing both electronic and acoustic drum sources. Or as a “band in a box” used by
solo/duo artists (or even a full band!) for bar, lounge and cabaret functions where
space and transport is limited, but high quality sound is the order of the day. For the
more technically minded the LR300 also features a 15” premium bass driver and
WARNING!
Please read the following list carefully.
A. ALWAYS ensure that a good quality mains plug is fitted to your Audio State™ conforming to the latest
B.S.I. standards (UK only) lead supplied.
B. ALWAYS ensure that the plug is wired in accordance with the regulations of your country.
C. DO NOT attempt to remove the chassis. There are no user serviceable parts inside your Audio State™.
D. ALWAYS have your Audio State™ serviced or repaired by competent, qualified service technicians.
E. NEVER use your Audio State™ in damp or wet conditions.
F. DO NOT obstruct airflow around the amplifier, a clearance of 30cm is required at the top, back and sides.
G. WARNING This apparatus must be earthed.
ENGLISH
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compression driven Constant Directivity high frequency horn with a pro grade
crossover and horn protection circuit. Each channel has 3 band EQ, gain and FX send
controls, whilst the master has a parallel FX loop, spring reverb and line outs to send
the mixed signal to a larger PA system or tape recorder if required.
The LR300 features a protection device fitted to the cross over filter to protect the
horn. If pushed too hard into distortion, the horn will be automatically de-activated.
Once the protection device has cooled down sufficiently it will re-activate the horn.
Besides the rugged side carrying handles, the LR300 has built in castor inserts to suit
the optional Marshall castors, available from your Marshall dealer.
LR230
The Marshall LR230 is a stereo 30 Watt 2x10” combo and is ideal for home practice
use providing the user(s) with the opportunity to mix up to 2 stereo sources such as
keyboards, drum machines, tape decks, CD players and sequencers. Other features
include an internal limiter to prevent distortion, a parallel effects loop and an in-built
spring reverb.
LR150
The Marshall LR150 however is ideal for rehearsals and gigging. This 1x15” with
piezo horn combo provides 150 Watts of power and allows a mix of up to 4 different
inputs. The user(s) can send the mixed signal via the Line Out to a P.A. which is
independent of the combo’s master volume allowing the combo to be used as an
onstage monitor. Other features include an internal limiter to prevent distortion, a
parallel effects loop and an in-built spring reverb.
This handbook is designed to help you get the most from your Marshall Linear
Response amplifier. We would suggest that you read this carefully before plugging in.
AUDIOSTATE
LR230
LR230 Front Panel Features (page 36)
Channel 1
1. Phono Input Left
This is a high impedance unbalanced input.
Typical uses of Line Inputs are drum machines,
C.D. players, tape deck, 4 tracks and computers.
This is for connection to the left output of
external device used.
2. Phono Input Right
This is a high impedance unbalanced input. This
is for connection to the right output of external
device used.
3. Left / Mono Jack
This is for either a mono input or the left side of a
stereo input if item 4 is used as well. This is a
high impedance unbalanced input. Typical uses
of Line Inputs are Keyboards, drum machines
and sequencers.
4. Right Jack
For use with the right side of a stereo input when
used in conjunction with item 3. This is a high
impedance unbalanced input.
5. Volume
Controls individual volume level for channel 1.
Overall volume will be governed by the Master
Volume control (item 20).
6. Effect & Reverb
When using the in-built reverb on the LR230 this
control will adjust the amount of reverb on
Channel 1. When using an external effects
processor this will control the amount of effected
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