Owner`s manual

47
audio sound waves amplified by one set of circuits. In a
similar manner the negative going audio sound waves are
amplified by another set of circuits. Refer to figure 100. Au-
dio signals connected to the unbalanced Inputs of the C1000
are first converted to a balanced signal before they are am-
plified. In a similar manner the balanced audio signals are
converted to unbalanced signals before they are available to
the unbalanced outputs jacks.
Moving Coil Preamplifier
One of the popular types of Phono Cartridges for Turn-
tables used today are “Moving Coil”. Due to their design,
the Moving Coil Cartridge’s output voltage is typically in
the range of 300 to 500 microvolts (millionth of a volt) and
thus requires additional amplification in order to match the
output voltage of a “Moving Magnet/Induced Moving Mag-
net” cartridge type with 2.5 to 10 millivolts (thousandths of
a volt). The lower the output voltage of the cartridge, the
greater the level of amplification required and thus the
greater potential for higher noise levels being generated by
the circuitry.
McIntosh has designed a new Totally Shielded Moving
Coil Preamplifier Module using special ultra low noise cir-
cuitry with out the need for a step-up transformer. Refer to
figure 101. The C1000 utilizies a double filtered power sup-
ply design, just for the Moving Coil Preamplifier Module. It
offers the ability to change the input impedance from 25
ohms to
1000 ohms
in six steps
to match a
wide vari-
ety of
Moving
Coil Car-
tridges.
Logic
Controlled
Circuitry
All Inputs, Outputs, Data Ports, Power
Control Outputs and Trigger Outputs are
controlled by Logic Circuits in the
C1000C. The microprocessor is the heart
of the Logic Circuits and is controlled by
McIntosh developed software. It imple-
ments all commands received from the
Front Panel Controls or the supplied Re-
mote Controls and indicates them on the
Alphanumeric Display. Refer to figure 102. When McIntosh
Source Components are connected to C1000C Data Ports,
basic command functions from the C1000 Remote Control
are passed on to those components, thus allowing one Re-
mote Control to operate an entire McIntosh Audio System.
The Logic Circuits sense when both the C1000P and
C1000T Preamplifiers are connected to the C1000C, at
which time the C1000 functions as if it was one Preampli-
fier with 18 Inputs.
Meter and Circuitry
The lack of accurate performance in ordinary meters has
presented difficult and complex problems. Ordinary meters
are incapable of indicating the short interval information in
a sound wave. Refer to figure 103 on the next page. The
mass of the meter movement is too great to respond to the
nearly instantaneous changes in music program material.
That short interval information can have a duration less
than as one-half of one thousandth of a second. Even if the
Technical Description, con’t
Figure 102
Figure 101
Figure 100