Front Panel Functions - Marshall Amplification JCM900 4100 Quick Start Manual

ENGLISH

FRONT PANEL FUNCTIONS

1. POWER SWITCH
Turns the amp on and off.
2. STANDBY SWITCH
The standby switch is used in conjunction with the
power switch to 'warm up' the amp before use.
Always turn the power on for two minutes
before switching the standby switch to the '1'
position.
The standby switch should be set to the '0'
position during breaks in performances instead
of leaving the amp on full power.
3. FOOTSWITCH
Connect the footswitch here. The footswitch
controls channel A/B switching and reverb on/off.
4. CHANNEL B 'ON' SWITCH & LED
Use this switch to select channel B. The light will
illuminate red when channel B is active.
5. CHANNEL B VOLUME
Adjusts the output volume of channel B.
6. CHANNEL B REVERB
Controls the amount of reverb on channel B.
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7. CHANNEL A VOLUME
Adjusts the output volume of channel A.
8. CHANNEL A REVERB
Controls the amount of reverb on channel A.
9. PRESENCE
Adjusts the high frequencies of the power amp.
Increasing the high frequencies adds more bite
to your sound.
10. BASS
Adjusts the low frequencies of the amp. It will
add bottom end and depth to your sound.
11. MIDDLE
Adjusts the mid frequencies of the amp, giving
you anything from scooped mids to a fat and
full sound.
12. TREBLE
Adjusts the upper frequencies of the amp. Your
tone will get brighter as it is turned up.
13. PREAMP (CHANNEL B) / LEAD GAIN
Sets the gain level for channel B. Lower settings
will give classic lead tones and higher settings
will give more drive and sustain.
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