From Jim Marshall
I would like to thank you personally for selecting
one of our new MB Bass amplifiers.
As a musician myself I fully understand the necessity
of achieving the right tone and feel to help inspire
musicians to reach their full creative potential – be
they aspiring beginners or more skilled players. With
this in mind I set my experienced R&D team the task of
designing a new range of affordable bass amplifiers that
truly captured the essence of the Marshall sound.
Utilising new technologies, some of which were developed for
our critically acclaimed AVT range, the new MB Series raises
the standard for what can be expected from a value-for-money
range of bass amplifiers and defines a new benchmark.
Like all the amplifiers in my new MB range, this amp was completely designed and
engineered in the UK and the most rigorous quality control procedures ensure that it meets
the standard of build you have come to expect from all Marshall products.
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Whether this is your first ever Marshall or is the latest addition to your arsenal of amps, the
tone, flexibility and feel of this compact, rugged amplifier will deliver the goods – from
bedroom to backstage!
I wish you every success with your new Marshall. Welcome to the family…
Yours Sincerely,
Dr Jim Marshall OBE and daughter Victoria (Managing Director)
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MB450H, MB4210 & MB4410 Front Panel Features
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MB60 & MB150 Front Panel Features
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1. INPUT Jack Socket
Jack input for your bass guitar. Use a good quality
guitar cable (i.e. one that’s screened/shielded) to
help prevent noise, interference and unwanted
feedback.
2. ACTIVE / PASSIVE Switch
This push switch allows you to change between
Active and Passive instruments. The gain is
reduced 6dB when in ‘Active’ position.
MODERN CHANNEL
The Modern channel hits those super crystal clean
notes when clarity is a must.
3. VOLUME Control - Modern Channel
This control adjusts the volume of the Modern
Channel.
4. BASS Control
Turning the Bass control will affect 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. MID FREQUENCY Control
Constitutes a semi-parametric equalizer together
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with the Middle control. It adjusts the centre
frequency where the Middle control takes affect.
6. MIDDLE Control
The middle frequencies tend to effect the fatness or
body of the tone. The frequency of the middle band
is adjusted by means of the Mid Freq control.
Usually this control will be used to remove mids
rather than increase them making the bass sound
rounder and fuller. Increasing the mids usually
makes the bass sound ‘boxy’.
7. TREBLE Control
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.
8. COMPRESSOR Switch & LED
This switch turns the Compressor control on and
off. When the switch is ‘in’ the Compressor control
is active and the LED will be illuminated green.
9. COMPRESSOR Control
The Compressor smoothes out your bass sound.
As you increase the amount of compression, so
you flatten out the peaks in the incoming signal.
When the compression reaches its threshold the
LED will change to red.
10. MODERN / CLASSIC Switch
This push switch allows you to change between the
amp’s two channels, Modern and Classic, via the
front panel. When this switch is ‘out’ the Modern
Channel is engaged and the LED is green. Pushing
it ‘in’ switches to the Classic Channel and the LED
changes to red.
CLASSIC CHANNEL
The Classic channel presents gain worthy of the
greatest rock bass player and heavy tone that is
expected from a Marshall amp.
11. GAIN Control
This control sets the 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
and drive the ECC83 valve until the required
amount of distortion is achieved creating the warm
Marshall tone.
12. BOOST Switch
The Boost switch increases the gain of the classic
channel. When the switch is engaged the whole
channel gain is raised making it much easier to get
an overdriven sound.
13. VOLUME Control - Classic Channel
This control adjusts the volume of the Classic
Channel.
14. BASS Control
Turning the Bass control will affect 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.
15. VOICE SHIFT Control
This 3 position control adjusts the overall tonal
voicing of the amplifier.
Position 1 tailors the response of the amplifier for
smooth low end, restrained lower mids, and mild
high end lift, to give the classic vintage valve bass
tone.
In position 2 the lower mid is made more prominent
whilst simultaneously the upper mids are subtly
scooped to give a more aggressive, growling
quality to the amplifier's tone.
Position 3 introduces a gentle overall mid boost for
an immediate, cutting, ‘in your face’ tone with the
mids scooped even further to give an immediate,
cutting sound.
16. VOICE Control
This control adjusts the response selected by the
Voice Shift control.
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17. TREBLE Control
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.
BLEND
(Only on MB450H, MB4210 & MB4410)
You can select a blend of the two channels either
from the front panel or via the supplied footswitch.
18. BLEND Switch & LED
This switch turns the channel mixing on.
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19. BLEND Control
By adjusting this control it is possible to blend your
signal between the Modern and Classic channels.
When you do this the LED will be illuminated red.
20. VOLUME Control - Blend
Adjusts the volume of the Blend.
Rear Panel Features
1. MAINS INPUT
Your amp is provided with a detachable mains
(power) lead, which is connected here.
Note: The specific mains input voltage rating that
your amplifier has been built for is shown on the
back panel. Before connecting for the first time,
please ensure that your amplifier is compatible with
your electricity supply. If you have any doubt,
please get advice from a qualified technician.
Your Marshall dealer will help you in this respect.
Please ensure the amplifier is switched off and
unplugged from the mains electricity supply before
being moved.
(panel shown is MB450H)
21. VOLUME - Master
(Only on MB450H, MB4210 & MB4410)
Controls the overall volume.
22. CD IN Jack Socket
If you want to jam to your favourite CD, tape or
mp3 player, merely connect the headphone output
of your device here, adjust the player’s volume to
match that of your guitar and ‘hey-presto’ - you've
got the perfect ‘play-along’ practice system.
23. HEADPHONES Jack Socket
For use when silent practice is the order of the day.
Connection of headphones will automatically shut
down the internal speaker / speaker cabinet.
24. POWER Switch
The power switch turns your amplifier on and off.
The LED next to the ‘Modern / Classic’ switch will
light up when your amplifier is turned on and will
not be lit when the amplifier is switched off.
Note: The power amplifier is protected by a
clipping limiter, so even when you play your amp
loud, the sound remains clean.
2. SPEAKER OUT Socket(s)
There is one speaker jack socket on the MB60 and
MB150 (marked ‘INTERNAL 4Ω’). This is where the
power amplifier is connected to the internal
loudspeaker. It can be used to drive an external
cabinet of at least 4 Ohms impedance.
There are 2 speaker jack/SPEAKON
sockets on the MB450H, MB4210 and MB4410.
They accept either a standard 1/4" jack or a
SPEAKON
same signal allowing 2 cabinets to be connected
simultaneously. The minimum load is 2 Ohms.
®
connector and both of them carry the
®
combo
3. FOOTSWITCH Jack Socket
Connect the supplied footswitch here. This enables
you to change between Modern and Classic
channels. The MB450H, MB4210 & MB4410 have
a twin footswitch which also switches the Blend
feature.
4. PRE/POST Switch
Selects the signal available at the Balanced line
out. When in PRE position the buffered and level
adjusted input signal is present at the DI output.
The signal before the Master potentiometer is
made available at this connector when in POST
position.
5. BALANCED 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.
6. RETURN Jack Socket
This is where you connect the OUTPUT of the
effects processor you are using in the effects loop.
7. SEND Jack Socket
If you want to use an external effects processor in
your amp’s built-in Series FX effects loop, this is
the jack you connect to the INPUT of the unit you
are using.
Technical Specification
MB450H MB4210 MB4410 MB150 MB60
Power (RMS) @ 4 Ohms 300W 300W 300W 150W 60W
Power (RMS) @ 2 Ohms 450W 450W
Pre-amp Valve ECC83 ECC83 ECC83 ECC83 ECC83
Bass Guitar Input Impedance 1MΩ 1MΩ 1MΩ 1MΩ 1MΩ
CD Input Impedance 10kΩ 10kΩ 10kΩ 10kΩ 10kΩ
Emulated Output Level +4dBu +4dBu +4dBu +4dBu +4dBu
Weight 15kg 33kg 51kg 30kg 23kg
Si ze ( mm) W, H, D 630 x 220 x 235 630 x 535 x 280 630 x 720 x 410 580 x 585 x 355 580 x 505 x 325
with extension cabinet
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Safe operating levels: The MB450, MB4210 and MB4410 amplifiers are designed to deliver 450W safely into 2ohm loads.
However, impedances lower than 4 ohms together with high signal levels will produce more internal heating which may
trigger the thermal protective muting.
EUROPE ONLY - 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 the Low Voltage Directive in the E.U.
EUROPE ONLY - Note: The Peak Inrush current for the MB450H, MB4210 and MB4410 is 28 amps.
The Peak Inrush current for the MB150 is 30 amps.
The Peak Inrush current for the MB60 is 13 amps.
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Follow all instructions and heed all warnings
KEEP THESE INSTRUCTIONS !
450W
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Suggested Settings
Here follows some sample settings to act as starting points from which to develop your own sounds.
N.B. Volume should be adjusted to taste.
Jazz
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OUT
Funk
IN
Classic Rock
Alternative Rock
OUT
IN
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