37
Technical Description, con’t
Figure 94
Power Supply Circuits
To compliment the design of the MA8000 Preampli-
fier, Power Amplifier and Micro Controller Circuitry
there is a high current high voltage power supply for
both channels. Therefore, it is important that they plug
directly into the wall outlet. The turn on inrush cur-
rent is cushioned by thermistors in the power trans-
former’s primary circuit. This soft start eliminates
component stress during turn-on. Refer to figures 93
and 95.
The very large Power Transfomer can supply over
13 amps of continuous current. Refer to figure 94
(golf ball is for size comparison). It is enclosed in the
legendary McIntosh Potted Enclosures and weighs
28 pounds. The MA8000 two main filter capacitors
can store over 140 Joules of energy for both amplifier
channels. Refer to figure 95.
The MA8000 can provide greater than 50 amperes
peak output current to drive uneven speaker loads.
Some speaker designs have input impedance dipping
to 1 or 2 ohms at various frequencies and the MA8000
has the output current reserve to drive them. This
guarantee an excellent signal to noise ratio and a wide
dynamic range that music demands.
A perfect companion for the MA8000 Integrated
Amplifier is the McIntosh MPC1500 Power Control-
ler. The MPC1500 provides stable voltage and superior
line surge protection for the MA8000.
Also, most owners desire one power switch for the
whole audio system. The MA8000 is equipped with a
circuit providing remote Power Control for McIntosh
Source Components.
Figure 95
MA8000 Power Supply
AC INPUT
7
7
-7
-7
FROM MICRO
CONTROLLER
MAIN
FILTER
Figure 93
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