Owner`s manual

34
optimized for the best transient performance and
minimum distortion. Refer to figure 83. Eight other
operational amplifiers are arranged in a circuit con-
figuration that is the equivalent of a series turned cir-
cuit. A control potentiometer inserts this series tuned
received from the Front Panel Controls or the supplied
Remote Controls and indicates them on the Front
Panel Display. Refer to figure 82.
When McIntosh Source Components are connected
to MA8000 Data Ports, basic command functions
from the MA8000 Remote Control are passed on to
those components, thus allowing one Remote Control
to operate an entire McIntosh Audio System.
Equalizer
The equalizer section uses several high technology
operational amplifiers. The amplifier stage has been
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 special ultra low noise
circuitry and thus no need for a step-up transformer. A
separate power supply is used just for the Moving Coil
Preamplifier Circuitry. The MA8000 offers the abil-
ity to change the Moving Coil Input Impedance from
50 ohms to 1000 ohms in five steps to match a wide
variety of Moving Coil Cartridges.
Logic Controlled Circuitry
All Inputs, Outputs, Data Ports, Power Control
Outputs and Trigger Outputs are controlled by Logic
Circuits in the MA8000. The microprocessor is the
heart of the Logic Circuits and is controlled by McIn-
tosh developed software. It implements all commands
Figure 83
Figure 82
MA8000 Power Amplier Block Diagram
Figure 84
(-)
(+)
(+)
(+)
(-)
(+)
(+)
(+)
AMPLIFIER
CONTROL
FROM
MICRO
CONTROLLER
OUTPUT
AUTOFORMER
OUTPUT
AUTOFORMER