Owner`s manual

4
Example speaker configurations and their impedance settings:
Impedance Selector setting
when Power Selector is set to:
Speaker Configuration
Total
Speaker Load
Full Power
Half Power,
Fixed Bias
Half Power,
Cathode Bias
Slant 6V combo speaker(s) 8 ohms 8 ohms 4 ohms 4 ohms
Carr extension cabinet 8 ohms 8 ohms 4 ohms 4 ohms
Combo speaker(s) and Carr
extension cabinet
4 ohms 4 ohms
*See below *See below
Marshall-style 4x12
extension cabinet
16 ohms 16 ohms 8 ohms 8 ohms
*In this configuration, a 2-ohm setting of the Impedance Selector would be required in either of the half
power modes. In this case, you should use the 4-ohm setting of the Impedance Selector. This will not harm
the amplifier, but the power tubes will have to work harder and thus age faster.
Mixing speakers and cabinets of differing loads, e.g. the 8 ohm combo speaker and a 16 ohm
extension cabinet, is not recommended.