Technical Description - McIntosh MC452 Owner's Manual

Block Diagram
of the
Power Supply
BACKUP
POWER SUPPLY
AC Power
over 20 amps of current. Refer to figure 23 (golf ball
is for size comparsion).
Figure 23
It is enclosed in the legendary McIntosh Potted Enclo-
sures and weighs 30lbs. The four super size main filter
capacitors can store over 200 Joules of energy for both
amplifier channels, necessary for the wide dynamic
range that "Digital Audio" demands. Refer to figure
24.
POWER
CONTROL
LIGHTING
CONTROL
CONTROL
LOGIC
INRUSH
CURRENT
MAIN RELAYS
LIMITER
Figure 22
The power amplifier draws high current from the AC
power line. Therefore, it is important that they plug
directly into the wall outlet.
Also, most owners desire one power switch for the
whole audio system. The MC452 is equipped with
a circuit that provides remote Power Control from
a McIntosh A/V Control Center. Refer to figure 25.
When the A/V Control Center is switched On, a (+5V)
signal operates the power relay in the MC452. The
Figure 24
Technical Description, con't
Figure 25
MC452 also has two remote Power Control Out Jacks.
The Power Control signal from these jacks are delayed
by a fraction of a second so that the turn on power
surge of the next power amplifier occurs at a later
time. This helps prevent power circuit overload that
could trip circuit breakers or blow fuses, a very impor-
tant feature in a high power Home Systems employing
multiple MC452 Power Amplifiers.
17