14
McIntosh Laboratory, the company who introduced
the world’s first amplifier that could be called “High
Fidelity”, has done it again. The McIntosh engineering
staff has created a power amplifier without compro-
mise, using the most advanced McIntosh circuit design
concepts.
The MC312 has a continuous average power
output rating of 300 watts per channel, with a peak
output current of 60 amperes, making it one of the
most advanced amplifiers available today. The distor-
tion limits for the MC312 are no more than 0.005%
at rated power output for all frequencies from 20Hz
to 20,000Hz. Typical performance at mid frequen-
cies is less than 0.002%. The true distortion readings
on the MC312 are so low, it takes special measuring
techniques to make accurate readings. The MC312 can
deliver the best possible performance from any type of
high quality loudspeaker system. Refer to figure 14.
Creating an amplifier with this level of perfor-
mance did not come easily. Many months of design,
testing and measuring were required. Extensive con-
trolled listening tests, the ultimate form of measuring,
were made before the final design was accepted.
Design Philosophy
The design philosophy incorporated in the MC312
involved several different techniques, all based on
sound scientific logic. Every stage of voltage or cur-
rent amplification must be as linear as possible prior
to the use of negative feedback. McIntosh engineers
know how to properly design negative feedback cir-
cuits so they contribute to the extremely low distortion
performance expected from a McIntosh amplifier.
The typical McIntosh owner would never accept the
approximately 100 times higher distortion of many
non-feedback designs. Refer to figure 15.
Technical Description
Figure 14
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