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MB60 & MB150 Front Panel Features
MB450H, MB4210 & MB4410 Front Panel Features
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
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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