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5. Treble
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.
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.
6. FX Send
For connection to the input of an external effects
processor or floor pedal.
7. FX Return
For connection from the output of an effects processor
or floor pedal.
8. Line Out
The Line Out Jack can be used for connection to
recording equipment for direct recording or for connection
to a P.A. system.
9. Headphones Jack
For use when silent practice is the order of the day.
Connection of headphones will automatically shut down the
internal speaker.
10. Power Switch
Switches the mains power to the combo on/off.
65 Watt Combo
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.
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.
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™.
3. 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.
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.
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.
5. Treble
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.
6. Compressor
The Compressor smoothes out your bass sound. As
you increase the amount of compression, so you flatten out
the peaks in the incoming signal.
7. Compressor Active LED
Indicates when the Compression threshold is reached
(i.e. when the compressor acts on the incoming signal).
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.
9. Limiter
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.
10. Volume
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.
11. FX Send
For connection to the input of an external effects
processor or floor pedal.
12. FX Return
For connection from the output of an effects processor
or floor pedal.
13. Line Out
The Line Out Jack can be used for connection to
recording equipment for direct recording or for connection
to a P.A. system.
14. Power Switch
Switches the mains power to the combo On/Off.
30 Watt Combo
Front Panel Features
1. Input
Plug your bass guitar in here. We recommend that you
always use a high quality screened cable to help prevent
noise, interference and unwanted feedback.
2. Gain
Controls the overall volume of the B30.
3. 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.
4. Middle
The middle frequencies tend to effect the fatness or
body of the tone. Turning this control up will make your
bass sound fatter, turning it down will hollow out the sound
and make it thinner.
B30
B65
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.
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.
WARNING! - Important safety instructions
WARNING: This apparatus must be earthed!
A PLEASE read this instruction manual carefully before switching on.
B ALWAYS
use the supplied mains lead, if a replacement is required please contact your authorised Marshall Dealer.
C NEVER attempt to by-pass the fuses or fit ones of the incorrect value.
D DO NOT attempt to remove the amplifier chassis, there are no user serviceable parts.
E 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 NEVER use an amplifier in damp or wet conditions. No objects filled with liquids should be placed on the apparatus.
G ALWAYS unplug this apparatus during lightning storms or when unused for long periods of time.
H 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 DO NOT switch the amplifier on without the loudspeaker connected.
J ENSURE that any extension cabinets used are of the correct impedance.
➲ Note: This equipment has been tested and found to comply with the requirements of the EMC directive (Environments
E1, E2 and E3 EN 55103-1/2) and Low Voltage directive in the E.U.
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
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
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!
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.
Follow all instructions and heed all warnings - KEEP THESE INSTRUCTIONS !
