When it is desired to use additional speakers with an amplifier, or multiple speakers with an amp
head, it is necessary to calculate the proper impedance setting. This is easily accomplished using a simple
ohm’s law formula:
FORMULA: Load 1 x Load 2 EXAMPLE: 8 Ohms x 8 Ohms
_______________ ________________ = 4 ohms
Load 1 + Load 2 8 Ohms + 8 Ohms
The correct setting for two 8 ohm cabinets connected in parallel should be the four ohm
setting at the amplifier. It is also possible to connect speaker systems of unequal impedance
values using the same formula, simply set the impedance switch to the value closest to the
result. Remember that volume output may be also be unequal, as the lower impedance
speaker is likely to be slightly louder because it demands most of the power from the
amplifier. Also, be sure that the power handling capacity is adequate.
POWER SOAK DEVICES
The use of “power-soak” devices is not recommended on your amplifier. These
devices can severely shorten the life of the output tubes which should be replaced as a matched
quartet. Replacing vacuum tubes can be quite expensive. If however one of these devices is
an integral part of your sound, choose one that is well designed and built by a reputable
company. When the amplifier starts to sound dull, it’s time to replace the output tubes.
Always replace tubes with premium quality tubes only! Cheap tubes will not sound good and will
not last. MATCHLESS sell replacement tubes for all models. Please contact your dealer or
call the factory.
SWITCHES AND INDICATORS
POWER: OFF/ON
This switch supplies power from the A.C. mains and is used to turn the
amplifier off and on as well as the switched A.C. outlet at the rear of the amplifier. The
amplifier on status is indicated by the illumination of the “MATCHLESS” logo on
the front of the amplifier.
STAND-BY:
This switch serves as a mute for the amplifier, and is used when changing or
unplugging a guitar cords or taking breaks, especially if volume control setting are to be set
and left. Additionally, the stand-by mode allows the amplifier to cool down, extending the
life of the output tubes. Substantial amounts of current flow through the output tubes
whenever the amplifier is operational, even with no signal from an instrument! A stand-by
status indicator is located on the front panel. The stand-by indicator lamp can be wired to
illuminate for either state. Stand-by or operate. All MATCHLESS amplifiers come from the
factory wired to indicate the operate mode.
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