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Rear Panel Features
Effects Loop Send & Return Jacks
To increase the flexibility of your 2203 even further, you
may choose to add external effects in its Series Effects
Loop, which allows direct connection of either floor pedals
or rack processors, with the Level switch (1) providing the
correct operating level.
1. Effects Loop Level Switch
This switch offers two different loop levels to enable you
to match the type of effect(s) connected to the Series
Effects Loop. The higher level (+4dBV: switch 'out') suits
rack processors and the lower level (-10dBV: switch 'in')
suits floor pedals (stomp boxes).
2. Effects Loop Bypass
When 'out' this switch completely bypasses the circuitry
involved in the effects loop to maintain the amp's absolute
tonal integrity.
3. Effects Loop Return Jack
Connect the (mono) output of an external effects
processor here.
4. Effects Loop Send Jack
Connect the (mono) input of an external effects
processor here.
NOTE: As a rule, time based effects such as Chorus, Delay
and Reverb are best suited for use in an effects loop. Effects
involving distortion or Wah Wah aren't usually put in an
effects loop because they sound best when they're 'before'
the amp (i.e. placed between the guitar and the amp's
input). This said, when it comes to tone there are no rules!
5/6. Loudspeaker Output Jacks
These are for connection to an external load, i.e. speaker
cabinet(s). (See item 7). Please refer to Important Safety
Instructions, page 2.
7. Output Selector
Matches the amplifier's output to the load impedance.
With all-valve amplifiers it is imperative that the amp is
connected to a load whilst in operation and that the
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impedance selected on the amp matches the total
impedance of the speaker cabinet(s) being used. For
example, if the amp is running into a single 16 Ohm cab,
the amp should accordingly be set to 16 Ohms. If running
into two 16 Ohm cabs, the amp should be set to 8 Ohms. If
running into two 8 Ohm cabs, the amp should be set to 4
Ohms. Failure to comply with these points will result in
damage to the amplifier.
Your amp should be completely powered down before
the selector is turned.
8. Mains Selector
Matches the amplifier mains transformer voltage to the
incoming mains voltage. Ensure that the rotary Mains
Selector is set to the correct mains voltage applicable to the
country where used. If you do not know the mains input
voltage contact your authorised Marshall dealer.
Your amp should be completely powered down before
the selector is turned. Adjustment from 230/220V to
110V or vice versa will require the mains fuse to be
changed to the corresponding value as detailed on the
rear panel.
9. Mains Input
Your amp is provided with a detachable mains (power)
lead which is connected here. 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 person. Your Marshall dealer will
help in this respect.
10. Mains Fuse
The correct value of mains fuse is specified on the rear
panel of the amplifier. Please refer to Important Safety
Instructions, page 2.
11. H.T. Fuse
The correct value of H.T. fuse is specified on the rear
panel of the amplifier. Please refer to Important Safety
Instructions, page 2.
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