The electrical and mechanical design of the MC300 power amplifier is the result of the
many years of engineering and manufacturing experience of the design staff at Mclntosh.
This "Know How", along with the meticulous attention to design and production details, makes
the MC300 one of the finest amplifiers ever produced by Mclntosh Laboratory.
The use of 10 complementary connected output transistors per channel, allows not only
full power output into normal loads, but extra high current output to drive uneven speaker
loads. Some speaker designs have impedance characteristics that may dip to as low as 1
or 2 ohms at certain frequencies. It is possible for the MC300 to deliver as much as 85 amperes
peak current into these lower impedance loads.
The MC300 will supply this extra current output with complete reliability due to the use
of Mclntosh Sentry Monitor protection circuits. Some power amplifier manufacturers have
claimed that their products do not use protection circuits since they compromise performance.
The real genius of Mclntosh engineering design has recognized these potential problems and
completely eliminated them. Properly designed protection circuits assure you an amplifier
that will operate under all types of user conditions with maximum reliability and freedom from
possible speaker or amplifier damage. The benefits of these designs mean you own an amplifier
that will continue to operate safely for many years.
The MC300 output is so distortion free, it is difficult to measure with conventional in-
struments. The performance limit is 0.005% maximum distortion, yet it is typical for an amplifier
to measure less than 0.002% at mid frequencies.
The power output watt meters on the MC300 are peak responding, and indicate the TRUE
power output of the amplifier. The MC300 meter circuits are constantly measuring both voltage
and current delivered into the speaker loads. A speaker may have a different load impedance
at different frequencies, resulting in a change of output current. The MC300 meters properly
react to this condition and indicate Real Output power.
Other desirable features are included such as high current gold plated output terminals
that will accept cable up to 0.204 inches in diameter. Balanced input connectors are also
provided in addition to the normal RCA inputs.
As in all Mclntosh power amplifiers, the famous patented Mclntosh POWER GUARD cir-
cuit is included. You never have to be concerned with amplifier overdrive when playing wide
dynamic range program sources such as compact discs.
Refer to the technical description for a full account of all the outstanding circuit and perform-
ance features of this superb power amplifier.
INTRODUCTION
5
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