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54
Clean Channel
1. High Impedance Input Jack Socket
This is where you plug your guitar into the amp. You must
use a screened (shielded) guitar cable. Never use an
unscreened (unshielded) speaker cable. The input to any
guitar amplifier is a very sensitive part of the signal path
and is therefore susceptible to airborne radio interference,
hence the need for a screened guitar cable. This
screened cable should be of good quality. If you are in
any doubt, your Marshall dealer will be more than happy
to help and advise.
2. Bass
This controls the amount of low frequencies (bottom-end)
in your clean tone.
3. Middle
This controls the mid-range of your sound. Turning this up
will make your guitars clean tone sound fatter and fuller.
4. Treble
This control determines the amount of treble and gives
your guitars clean tone a defining edge as it is turned up.
5. Volume
This control sets the overall output volume of the Clean
channel.
Switching and Status Section
6. Boost Switch
This button allows the player to select a gain and volume
boost on the Overdrive channel from the front panel if the
supplied footswitch is not used. (See note below)
7. Clean Channel Status LED
This green LED indicator will illuminate whenever the
Clean channel is selected.
8. Clean/Overdrive Channel Select Switch
This button allows the player to select the Clean or
Overdrive channels from the front panel if the supplied
footswitch is not used. (See note below)
Note: The front panel push buttons must be in the ‘out’
position when the amplifier is used with the supplied
footswitch otherwise the footswitch will not function!
9. Overdrive Channel Status LED
This red LED indicator will illuminate whenever the
Overdrive channel is selected.
10. Boost Status LED
This red LED indicator will illuminate whenever the boost
function is active regardless of which channel is currently
selected. The player can go from clean to crunch or clean
to boosted Overdrive as well as crunch to boosted
Overdrive, making for a versatile live setup.
Overdrive Channel
11. Crunch Balance
This control sets the difference in gain and volume
between the unboosted Overdrive (crunch) and the
boosted Overdrive. It only operates in the unboosted
mode and does not affect the boosted mode. Turning
this control down will decrease the gain and volume of the
unboosted Overdrive tones in comparison to the boosted
mode. Turning it up will increase the gain and volume
resulting in progressively less difference between the two
modes. Balancing this control for an optimum preset is
the goal. (See ‘Tonal Tips’)
12. Gain
This controls the amount of saturation and hence
distortion present in your overdriven tone. Turning this up
will add more harmonic distortion to your sound resulting
in a progressively thicker and more sustaining quality to
your overdriven tones. (See ‘Tonal Tips’)
13. Bass
This controls the amount of low frequencies (bottom-end)
in your overdrive tone.
14. Middle
This controls the mid-range of your sound. Turning this up
will make your guitar overdrive sound fatter and fuller.
15. Treble
This control determines the amount of treble and gives
your guitar overdrive tone a defining edge as it is turned
up.
16. Volume
This control sets the overall output volume of the
Overdrive channel. (See ‘Tonal Tips’)
Master Section
17. Reverb
This controls the level of the internal analogue spring
reverb that is mixed with the direct guitar signal.
18. Resonance
This control operates in the power amp section of your
amp and adds low frequencies to your tone, creating
weight and depth. As you turn this control up your sound
will acquire more bottom-end.
19. Presence
This control operates in the power amp section of your
amp and adds high frequencies to your tone, creating
crispness and bite. As you turn this control up your sound
will become more cutting.
The optimum settings for the ‘Presence’ and ‘Resonance’
controls are heavily dependant on the overall volume that
the power amp is operating at. For example, at low
volumes, low Presence and high Resonance settings may
sound best. At high volumes the opposite may be true.
20. Standby Switch
The Standby Switch is used in conjunction with the Power
Switch (21) to ‘warm up’ the amplifier before use and to
prolong the life of the valves. When powering up the
amplifier always engage the Power Switch (21) first,
leaving the Standby switch in the ‘OFF’ position. This
enables the heater voltage, allowing the valves to come
up to their correct operating temperature. After
approximately two minutes the valves will have reached
their correct operating temperature and the Standby
Switch can then be engaged. In order to prolong valve
life, the Standby Switch alone should also be used to turn
the amplifier on and off during breaks in a performance.
Also, when switching off, always disengage the Standby
Switch prior to the main Power Switch.
21. Power Switch
This is the On/Off switch for the mains electric power to
the amplifier.
SAFETY NOTE: Please ensure the amplifier is
switched off and unplugged from the mains
electricity supply whenever it is moved.
Tonal Tips
In order to maximise the live playing potential of this amp
it is important to understand the interactivity between the
Overdrive Volume (16), the Gain (12) and the Crunch
Balance (11). Careful blending of these three controls is
the key to optimum performance. Please take the time to
find what works best for you.
The first thing to set is the Overdrive Volume (16) and
Gain (12) in the boosted mode to give you your required
solo level. Set the Presence, Resonance and Overdrive
section EQ to your liking.
Next, disengage the boost and set the Crunch Balance
(11) to give the desired crunch volume/gain difference
compared to the boosted sound.
Higher Crunch Balance settings result in more unboosted
mode gain but less of a volume difference when engaging
the boost.
Lower Crunch Balance settings result in less unboosted
mode gain but more of a volume difference when
engaging the boost.
Finally, switch to the Clean channel and adjust the volume
and EQ section to the desired level.
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MA Series Front Panel Features
Front panel shows MA100C –all other MA Series Head and Combo front panels share the same features.
ENGLISH
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