B30
,
B65
&
B150
Bass Combos
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Another tip, for those of you who have got active basses
who want a distorted tone, try plugging your bass into the
Passive Input. This will cause no harm and may provide the
sound you are looking for.
5. Treble
WARNING! - Important safety instructions
By adjusting the Treble control you can add or take
!
away the higher frequencies in your bass tone. By
increasing the amount of treble you will make your tone
brighter, ideal for more percussive playing styles.
WARNING: This apparatus must be earthed!
A
B
C
D
E
PLEASE read this instruction manual carefully before switching on.
ALWAYS use the supplied mains lead, if a replacement is required please contact your authorised Marshall Dealer.
NEVER attempt to by-pass the fuses or fit ones of the incorrect value.
4. Bass
Turning the Bass control will effect the amount of low
frequencies or bottom end in your bass guitar tone. Rotating
this clockwise will increase the amount of lower tones
generally making your bass sound deeper. Turning this
control anti-clockwise will reduce the bass frequencies in
your tone producing a reduction in bottom end thud.
Effects Loop
The effects loop is used for connecting an external
effects processor or floor pedal. The effects loop on the
Marshall B30 is sensitive enough to suit the level of either
type (processor or floor pedal) to ensure that a perfect match
is made.
DO NOT attempt to remove the amplifier chassis, there are no user serviceable parts.
Refer all servicing to qualified service personnel including replacement of fuses and valves. Servicing is
required when the apparatus has been damaged in any way, such as when the power supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to
rain or moisture, does not operate normally or has been dropped.
F
G
H
NEVER use an amplifier in damp or wet conditions. No objects filled with liquids should be placed on the apparatus.
ALWAYS unplug this apparatus during lightning storms or when unused for long periods of time.
5. Treble
6. FX Send
For connection to the input of an external effects
processor or floor pedal.
By adjusting the Treble control you can add or take
away the higher frequencies in your bass tone. By
increasing the amount of treble you will make your tone
brighter, ideal for more percussive styles of playing.
Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles and at
the point where they exit from the apparatus.
I
J
DO NOT switch the amplifier on without the loudspeaker connected.
ENSURE that any extension cabinets used are of the correct impedance.
7. FX Return
For connection from the output of an effects processor
or floor pedal.
➲ Note: This equipment has been tested and found to comply with the requirements of the EMC directive (Environments
6. Com pressor
E1, E2 and E3 EN 55103-1/2) and Low Voltage directive in the E.U.
The Compressor smoothes out your bass sound. As
you increase the amount of compression, so you flatten out
the peaks in the incoming signal.
8. Line Out
EUROPE ONLY - Note: The Peak Inrush current for the B30 is 5 amps, the B65 is 9 amps and the B150 is 28 amps.
➲ Caution: Any changes or modifications not expressly approved by the party responsible for compliance may void the
The Line Out Jack can be used for connection to
recording equipment for direct recording or for connection
to a P.A. system.
user’s authority to operate the equipment.
➲ Note: It is recommended that all audio cables used to connect to the B30, B65 or B150 are of a high quality screened
7. Com pressor Active LED
Indicates when the Compression threshold is reached
(i.e. when the compressor acts on the incoming signal).
type. These should not exceed 10 metres in length.
➲ WARNING: Do not obstruct ventilation grilles and always ensure free movement of air around the amplifier!
9. Headphones J ack
For use when silent practice is the order of the day.
Connection of headphones will automatically shut down the
internal speaker.
USA ONLY - DO NOT defeat the purpose of the polarised or grounding type plug. A polarised plug has two
blades with one wider than the other. A grounding type plug has two blades and a third grounding prong. The
wide blade or the third prong is provided for your safety. When the provided plug does not fit into your outlet,
consult an electrician for replacement of the obsolete outlet.
8. 5 Band Graphic Equaliser
To allow you to further tailor your sound, with the
Graphic EQ it is possible to cut or boost 5 specific
frequency bands fundamental to the projection and shaping
of bass guitar tone.
10. Power Switch
Follow all instructions and heed all warnings - KEEP THESE INSTRUCTIONS !
Switches the mains power to the combo on/off.
9. Lim iter
B65
Our latest SLS Limiter allows you to switch the built-in
Limiter circuitry in or out. With the Limiter switched on
you are ‘limiting’ the power amp to keep distortion to a
minimum at high overall volume levels - without unduly
affecting the amp’s natural tonal performance. At lower
volume levels the Limiter will have no effect.
65 Watt Com bo
The concept behind Marshalls’ revolutionary Valvestate™ technology was to emulate the performance of a
Marshall valve power stage without actually using power valves. By providing the warmth, feel, responsiveness and
sheer musicality of a valve amp without involving the cost and weight, Valvestate™ has placed this classic valve-
like sound in the hands of thousands of musicians the world over.
Front Panel Features
1. Active Input
This input is designed to take the signal from an active
bass. If your bass guitar is active plug in here. We
recommend that you always use a high quality screened
cable to help prevent noise, interference and unwanted
feedback.
10. Volum e
By harnessing the technology used in Valvestate and adapting it for use with bass guitar we have created Bass-
State™ - a revolutionary new concept in bass amplification. Bass-State power actually delivers that fat, smooth,
more rounded bottom end with full bodied middle and vibrant treble - just like an all-valve amp, but with none of the
drawbacks. From private practice up to full stage performance, Bass-State combos have the flexibility, features and
power ratings to suit any type of bass and any type of bass player.
Controls the overall volume of the B65.
Effects Loop
The effects loop is used for connecting an external
effects processor or floor pedal. The effects loop on the
Marshall B65 is sensitive enough to suit the output level of
either type (processor or floor pedal) to ensure that a perfect
match is made.
2. Passive Input
This input is designed to take the signal from a passive
bass. If your bass guitar is passive plug in here. We
recommend that you always use a high quality screened
cable for this to help prevent noise, interference and
unwanted feedback.
B30
11. FX Send
For connection to the input of an external effects
processor or floor pedal.
frequencies or bottom end in your bass guitar tone. Rotating
this clockwise will increase the amount of lower tones
generally making your bass sound deeper.
30 Watt Com bo
Though the above inputs were designed around the
signal from an active bass and a passive bass guitar
respectively, you should experiment to see which input best
suits your style. Don’t worry, connecting your bass to the
‘wrong’ input will not harm your Bass-State™.
Front Panel Features
1. Input
12. FX Return
For connection from the output of an effects processor
or floor pedal.
Turning this control anti-clockwise will reduce the bass
frequencies in your tone producing a reduction in bottom
always use a high quality screened cable to help prevent
end thud.
Plug your bass guitar in here. We recommend that you
13. Line Out
noise, interference and unwanted feedback.
3. Gain
The Line Out Jack can be used for connection to
recording equipment for direct recording or for connection
to a P.A. system.
4. Middle
2. Gain
Sets operating level of pre-amp. If you require a clean
bass sound turn this control up until your bass just starts to
distort and then back it off slightly. If on the other hand you
would like a distorted sound, simply turn up the Gain
control until the required amount of distortion is achieved.
The middle frequencies tend to effect the fatness or
body of the tone. Turning this control up will make your
Controls the overall volume of the B30.
bass sound fatter, turning it down will hollow out the sound
and make it thinner.
3. Bass
14. Power Switch
Turning the Bass control will effect the amount of low
Switches the mains power to the combo On/Off.
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3
4
amount of lower tones generally making your bass
sound deeper. Turning this control anti-clockwise
will reduce the bass frequencies in your tone
producing a reduction in bottom end thud.
Each bass displays certain tonal characteristics,
some for example will sound brighter than others
while others may sound bassier.
Suggested Settings
Before we look at some suggested settings there
are a couple of points that you should remember;
B150
B150: 150 Watt Com bo
Front Panel Features
1. Active Input
For this reason again you may find that these
suggested settings need some alteration to give the
required sound.
1- Taste in sound is a very personal thing. What
might sound great to one bass player might not appeal
to another bassist. Therefore these suggested settings
may need some alterations to suit your own personal
taste.
6. Deep Switch
Push switch to add extra bottom to the low end
of the primary EQ.
Here then follows three simple settings for both
the B30 and the B65 suitable for Slap, Fingers and
Plectrum styles.
This input is designed to take the signal from an
active bass. If your bass guitar is active plug in here.
We recommend that you always use a high quality
screened cable to help prevent noise, interference and
unwanted feedback.
2- One of the main influences on your sound will
be your bass.
7. Treble
We hope that these settings provide you with a
useful starting point to develop your own killer bass
tones.
By adjusting the Treble control you can add or
take away the higher frequencies in your bass tone.
By increasing the amount of treble you will make
your tone brighter, ideal for percussive styles of
playing.
B30
2. Passive Input
This input is designed to take the signal from a
passive bass. If your bass guitar is passive plug in
here. We recommend that you always use a high
quality screened cable to help prevent noise,
interference and unwanted feedback.
B30
E.Q.
Input
8. Bright Switch
BASS
MIDDLE
TREBLE
GAIN
FX SEND
FX
RETURN
LINE OUT
HEAD
PHONES
Power
POWER
ON
Push switch to add brightness and attack to the
top end of the primary EQ.
0
10
0
10
0
10
0
10
- Though the above inputs were designed
around the signal from an active bass and a passive
bass guitar respectively, you should experiment to
see which input best suits your style. Don’t worry,
connecting your bass to the ‘wrong’ input will not
harm your Bass-State™ or your bass guitar.
9. Com pressor
The Compressor smoothes out your bass sound.
As you increase the amount of compression, so you
flatten out the peaks in the signal.
B30
E.Q.
MIDDLE
Input
BASS
TREBLE
GAIN
FX SEND
FX
RETURN
LINE OUT
HEAD
PHONES
Power
POWER
ON
0
10
0
10
0
10
0
10
10. Com pressor Active LED
3. Gain
Indicates whether the Compressor is in
operation.
This controls the amount of input from your bass
and the amount of input from the pre-amp to the
power amp. If you require a clean bass sound turn
this control up until your bass just starts to distort and
then back it off slightly. If on the other hand you
would like a distorted sound, simply turn up the Gain
control until the required amount of distortion is
achieved. Another tip, for those of you who have got
active basses who want a distorted tone, is to try
plugging your bass into the Passive Input. This will
cause no harm and may provide the sound you are
looking for.
B30
E.Q.
MIDDLE
Input
BASS
TREBLE
GAIN
FX SEND
FX
RETURN
LINE OUT
HEAD
PHONES
Power
11. 7 Band Graphic
POWER
ON
To allow you to further tailor your sound, with
the Graphic it is possible to cut or boost 7 specific
frequencies. If you do not want to alter the shape of
your sound with the Graphic simply leave the sliders
set to 0.
0
10
0
10
0
10
0
10
B65
12. Lim iter
100 Hz
100 Hz
100 Hz
250 Hz
250 Hz
250 Hz
500 Hz
500 Hz
500 Hz
1
1
1
KHz
KHz
KHz
2.5 KHz
Traditional amplifiers when run at high volumes
will begin to clip or distort. The Limiter facility
when in use will prevent the power amp clipping at
high volumes and at low volumes will have no effect.
Input
ACTIVE
PASSIVE
E.Q.
B65
+15dB
GAIN
BASS
TREBLE
COMP
VOLUME
FX
SEND
FX
RETURN
LINE
OUT
4.Blend
0
POWER
ON
With the B150 it is possible to blend your signal
between a valve and/or solid-state input pre-amp
section. Each type of pre-amp produces a different
character of sound, valve pre-amps for example tend
to give a very warm tone while solid-state pre-amps
give a harder, snappier response, ideal for more
percussive styles of bass playing. As these circuits
are blendable, it is possible to have degrees of both
types of pre-amp in your signal, to combine the best
of both worlds.
10Active
Power
Power
Power
0
0
0
10
+15
-15
+15
-15
0
0
0
0
10
-15dB
13. Volum e
Controls the overall volume of the B150.
2.5 KHz
Input
ACTIVE
PASSIVE
E.Q.
B65
+15dB
GAIN
BASS
TREBLE
COMP
VOLUME
- Effects Loop-
FX
SEND
FX
RETURN
LINE
OUT
0
POWER
ON
An effects loop is used for connecting an
external effects processor or floor pedal. The effects
loop on the Marshall B150 is compatible with the
output level of either type (processor or floor pedal)
to ensure that a perfect match is made.
10Active
10
+15
-15
+15
-15
0
10
-15dB
2.5 KHz
5. Bass
Input
ACTIVE
PASSIVE
E.Q.
B65
+15dB
GAIN
BASS
TREBLE
COMP
VOLUME
14. FX Send
FX
SEND
FX
RETURN
LINE
OUT
Turning the Bass control will effect the amount
of low frequencies or bottom end in your bass guitar
tone. Rotating this clockwise will increase the
0
POWER
ON
For connection to the input of an external effects
processor or floor pedal.
10Active
10
+15
-15
+15
-15
0
10
-15dB
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5
6
Connecting a piece of audio electrical equipment
which has been earthed to another piece of earthed
electrical equipment, such as an amplifier and
recording equipment, can result in a background
hum. Should this problem occur, the B150 features
an Earth Lift Switch which when used will alleviate
the hum.
15. FX Return
Rear Panel Features
1. Mains Input
For connection from the output of an external
effects processor or floor pedal.
For connection to the mains. Always ensure that
a good quality mains lead is used and that the plug is
wired in accordance with the regulations of your
country.
16. Line Out
The Line Out Jack can be used for connection to
home recording equipment for direct recording.
18. Power Switch
The rear panel of the B150 features air vents to
keep the amplifier cool. Care should be taken to
ensure that these vents do not become obstructed
while the amplifier is in use.
17. D.I. Output with Earth Lift Switch
On/off mains power switch for the B150 with
LED to indicate when on.
The D.I. Output is designed for connection to
professional recording or P.A. equipment.
Suggested Settings
Suggested Settings
80 Hz
160 Hz 320 Hz 640 Hz 1K 25Hz
2KHz 2.5KHz
B150
Input
E.Q.
+15dB
Before we look at some suggested
settings there are a couple of points
that you should remember ;
Volume
BASS
ACTIVE
PASSIVE
GAIN
BLEND
TREBLE
COMP
FX
SEND
FX
RETURN
LINE
OUT
0
POWER
ON
EARTH
LIFT
LIMITER
Power
1 / Taste in sound is a very
personal thing. What might sound
great to one bass player might not
appeal to another bassist. Therefore
these suggested settings may need
some alterations to suit your own
personal taste.
-15dB
0
10
Solidstate
Valve
-15
+15
-15
+15
0
10
0
10
D.I.
On
80 Hz
160 Hz 320 Hz 640 Hz 1K 25Hz
2KHz 2.5KHz
B150
Input
ACTIVE
PASSIVE
E.Q.
+15dB
2 / One of the main influences on
your sound will be your bass. Each
bass displays certain tonal
characteristics, some for example
will sound brighter than others
Volume
BASS
GAIN
BLEND
TREBLE
COMP
FX
SEND
FX
RETURN
LINE
OUT
0
POWER
ON
EARTH
LIFT
LIMITER
Power
-15dB
0
10
Solidstate
Valve
-15
+15
-15
+15
0
10
0
10
D.I.
while others may sound bassier. For
this reason again you may find that
these suggested settings need some
alteration to give the required sound.
Off
On
Here then follows three simple
settings for the B150 for slap,
fingers and plectrum styles. We
hope that these settings provide you
with a useful starting point to
80 Hz
160 Hz 320 Hz 640 Hz 1K 25Hz
2KHz 2.5KHz
B150
Input
ACTIVE
PASSIVE
E.Q.
+15dB
Volume
BASS
GAIN
BLEND
TREBLE
COMP
FX
SEND
FX
RETURN
LINE
OUT
0
POWER
ON
EARTH
LIFT
LIMITER
develop your own killer bass tones.
Power
-15dB
0
10
Solidstate
Valve
-15
+15
-15
+15
0
10
0
10
D.I.
Please Note : Gain and Volume
should be adjusted to taste.
On
Off
B150
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7
8
B30
E.Q.
Input
BASS
MIDDLE
TREBLE
GAIN
FX SEND
FX
RETURN
LINE OUT
HEAD
PHONES
Power
POWER
ON
0
10
0
10
0
10
0
10
1
2
3
4
5
6
7
8
9
10
100 Hz
250 Hz
500 Hz
1
KHz
2.5 KHz
Input
E.Q.
B65
+15dB
ACTIVE
PASSIVE
GAIN
BASS
TREBLE
COMP
VOLUME
FX
SEND
FX
RETURN
LINE
OUT
0
POWER
ON
10Active
Power
0
10
+15
-15
+15
-15
0
0
10
-15dB
7
10
11
12
14
9
13
8
1
2
3
4
5
6
80 Hz
160 Hz 320 Hz 640 Hz 1K 25Hz
2KHz 2.5KHz
B150
Input
E.Q.
+15dB
Volume
BASS
ACTIVE
PASSIVE
GAIN
BLEND
TREBLE
COMP
FX
SEND
FX
RETURN
LINE
OUT
0
POWER
ON
EARTH
LIFT
LIMITER
Power
-15dB
0
10
Solidstate
Valve
-15
+15
-15
+15
0
10
0
10
D.I.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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