McIntosh MA6900 Owner's Manual download pdf (Page 18)

Technical Description

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 cre-

ated a power amplifier without compromise, using the most

advanced McIntosh circuit design concepts.

A continuous average power output rating of 200 watts

and with an output current of greater than 50 amperes per

channel, making this the most advanced Integrated Ampli-

fier McIntosh has ever manufactured. The distortion limits

for the MA6900 are no more than 0.005% at rated power

output for all frequencies from 20Hz to 20,000Hz. Typical

performance at mid frequencies is less than 0.002%. The

true distortion readings on the MA6900 are so low, it takes

special measuring techniques to make accurate readings.

The MA6900 can deliver the best possible performance

from any type of high quality loudspeaker system.

Creating an amplifier with this level of performance did

not come easily. Many months of design, testing and mea-

suring were required. Extensive controlled listening tests,

the ultimate form of measuring, were made before the final

design was accepted.

Preamplifier Design Philosophy

All signal switching in the MA6900 is done by Electro-

Magnetic devices. Electro-Magnetic Switching is a proven

technology that uses the latest in materials and manufactur-

ing methods. Each switch consists of a glass tube that is

filled with an inert oxygen-

free atmosphere and sealed

with tiny leads protruding

from either end. These leads

extend into the tube and

overlap one another with a

separation of a few thou-

sandths of an inch. The leads

are made from a ferrous ma-

terial that is influenced by a

magnetic field. They are first

plated with gold as a base

material, then with rhodium

and finally ruthenium. Ru-

thenium is the best contact

material known.

The glass assembly is

then placed in the center of a

multilayer coil of copper

wire. The entire assembly is

molded together in a tough

shock absorbing material.

Bottom Inside View of the MA6900

The switch and coil connectors extend from the bottom in

the form of printed circuit board terminals. When a DC

voltage is applied to the coil, current flows and creates a

Equalizer Control Adjustment Range

Hz (Hertz)

(Decibel)

Figure 10

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