Marshall Amplification Musical Instrument Amplifier MB150 User Manual

 
MB450H, MB4210 & MB4410 Front Panel Features  
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MB60 & MB150 Front Panel Features  
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with the Middle control. It adjusts the centre  
frequency where the Middle control takes affect.  
1. INPUT Jack Socket  
10. MODERN / CLASSIC Switch  
14. BASS Control  
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.  
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.  
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.  
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’.  
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.  
CLASSIC CHANNEL  
The Classic channel presents gain worthy of the  
greatest rock bass player and heavy tone that is  
expected from a Marshall amp.  
15. VOICE SHIFT Control  
This 3 position control adjusts the overall tonal  
voicing of the amplifier.  
MODERN CHANNEL  
7. TREBLE Control  
The Modern channel hits those super crystal clean  
notes when clarity is a must.  
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.  
11. GAIN Control  
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.  
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.  
3. VOLUME Control - Modern Channel  
This control adjusts the volume of the Modern  
Channel.  
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.  
8. COMPRESSOR Switch & LED  
4. BASS Control  
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.  
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.  
12. BOOST Switch  
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.  
9. COMPRESSOR Control  
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.  
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.  
5. MID FREQUENCY Control  
16. VOICE Control  
Constitutes a semi-parametric equalizer together  
13. VOLUME Control - Classic Channel  
This control adjusts the volume of the Classic  
Channel.  
This control adjusts the response selected by the  
Voice Shift control.  
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17. TREBLE Control  
21. VOLUME - Master  
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.  
5. BALANCED LINE OUT  
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.  
(Only on MB450H, MB4210 & MB4410)  
Controls the overall volume.  
The Line Out Jack can be used for connection to  
recording equipment for direct recording or for  
connection to a P.A. system.  
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.  
6. RETURN Jack Socket  
This is where you connect the OUTPUT of the  
effects processor you are using in the effects loop.  
BLEND  
4. PRE/POST Switch  
(Only on MB450H, MB4210 & MB4410)  
You can select a blend of the two channels either  
from the front panel or via the supplied footswitch.  
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.  
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.  
23. HEADPHONES Jack Socket  
18. BLEND Switch & LED  
For use when silent practice is the order of the day.  
Connection of headphones will automatically shut  
down the internal speaker / speaker cabinet.  
This switch turns the channel mixing on.  
19. BLEND Control  
Technical Specification  
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.  
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.  
MB450H  
300W  
450W  
ECC83  
1MΩ  
MB4210  
MB4410  
300W  
MB150  
150W  
MB60  
60W  
-
ECC83  
1MΩ  
Power (RMS) @ 4 Ohms  
Power (RMS) @ 2 Ohms  
Pre-amp Valve  
Bass Guitar Input Impedance  
CD Input Impedance  
Emulated Output Level  
Weight  
300W  
450W  
450W  
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20. VOLUME Control - Blend  
ECC83  
1MΩ  
ECC83  
1MΩ  
ECC83  
1MΩ  
Adjusts the volume of the Blend.  
Note: The power amplifier is protected by a  
clipping limiter, so even when you play your amp  
loud, the sound remains clean.  
10kΩ  
+4dBu  
10kΩ  
10kΩ  
10kΩ  
10kΩ  
+4dBu  
33kg  
+4dBu  
51kg  
+4dBu  
30kg  
+4dBu  
23kg  
15kg  
Rear Panel Features  
Size (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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1. MAINS INPUT  
2. SPEAKER OUT Socket(s)  
Your amp is provided with a detachable mains  
(power) lead, which is connected here.  
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.  
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.  
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.  
There are 2 speaker jack/SPEAKON® combo  
sockets on the MB450H, MB4210 and MB4410.  
They accept either a standard 1/4" jack or a  
SPEAKON® connector and both of them carry the  
same signal allowing 2 cabinets to be connected  
simultaneously. The minimum load is 2 Ohms.  
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.  
Please ensure the amplifier is switched off and  
unplugged from the mains electricity supply before  
being moved.  
The Peak Inrush current for the MB60 is 13 amps.  
Follow all instructions and heed all warnings  
KEEP THESE INSTRUCTIONS !  
(panel shown is MB450H)  
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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  
OUT  
Funk  
IN  
Classic Rock  
OUT  
Alternative Rock  
IN  
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