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Footswitch Operation
The three way footswitch provided with your Anniversary amplifier is for channel switching between the
three channels. Connection should be made to the DIN connector on the rear panel of the amp. An LED
above the switch corresponds to the channel which has been selected. Switching can also be achieved via
MIDI. (See operational note B).
Speaker Connection
The type of cabinet and speakers has a fundamental effect on the quality of your sound. Also vitally
important is the matching of speaker impedance to the amplifier. Incorrect matching will impair the
performance and eventually damage the amplifier.
Impedance is usually marked on the cabinet input socket. If you have any doubts, have the speakers
checked by a qualified technician. When using a single cabinet the amp and cabinet should be identical
(e.g. 16 Ohm 4x12 cab = 16 Ohm amp selection). If two 16 Ohm cabinets are used, then the amplifier
should be switched to 8 Ohms. Where two 8 ohm cabinets are employed the amp should be switched to
4 Ohms. A speaker load below 4 Ohms cannot be used. Following these simple rules should maintain
long life and minimise amplifier servicing requirements. Unlike solid state amps, valve amplifiers don't
increase in power as speaker impedance is lowered.
Operational Note J: Impedance switching
It should be noted that although the output transformer has 3 impedance connections, only two are switchable from
outside the amplifier. These are 16 ohm and 8 Ohm on heads and 8 Ohm and 4 Ohm on combo's. If your particular
application requires this to be different, the transformer connections can easily be altered by a qualified technician.
Marshall Cabinet Chart
Model No.
6912 (1x12)
6960A (4x12)
6960B (4x12)
1922 (2x12)
1936 (2x12)
1912 (1x12)
In some cabinets the speaker type may vary (refer to rating plate for correct impedance).
Except in US
Power Rating
Mono
Stereo
200
N/A
300
150
300
150
150
75
150
75
150
N/A
Impedance
Mono
Stereo
8
N/A
4 or 16
8
4 or 16
8
8
16
8
16
8
N/A
8
Speaker Type
G12-Gold Celestion
G12T-75 Celestion
G12T-75 Celestion
G12T-75 Celestion
G12T-75 Celestion
G12B-150 Celestion
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