Owner`s manual

18
Figure 17
speakers, and deliver equal power. McIntosh’s new DPM
®
design enables it to run on higher voltage rails when con-
nected to less current-hungry 8 ohm speakers and still de-
liver 200 watts. The power penalty usually paid with 8 ohm
speakers on high current ampliers does not exist with this
new design.
The high efciency circuit design of the MC207 con-
tributes to low operating temperatures. More than 2625
square inches of heat sink area occupies almost half of the
MC207’s chassis space and keeps the amplier operating
safely with
convection
cooling.
No fans
are need-
ed. Refer
to gure
16.
Protection
Circuits
The
MC207
incorpo-
rates its
version of
the McIn-
tosh Sen-
try Moni-
tor output
transistor
protection
circuit. Re-
fer to gure 17. There is absolutely no compromise in sonic
performance with this circuit, and it ensures safe operation
of the amplier under even the most extreme operating
conditions. The
different types
of protection
circuits incor-
porated in the
MC207 insure
a long and safe
operating life.
The MC207
also includes the
unique patented
McIntosh Power
Guard circuit.
Power Guard
eliminates the
possibility of
ever overdriv-
ing the amplier
into clipping.
Refer to gures
18, 19 and 20.
An overdriven
amplier can
produce both
audible and
inaudible dis-
tortion levels
exceeding 40%.
The audible
distortion is
unpleasant to
hear, but the
inaudible ultra-
sonic distortion
is also undesir-
able, since it
can damage
valuable Loud-
speaker System
tweeters. You
will never expe-
rience the harsh
and damaging
distortion due to
clipping.
The Power
Guard circuit
Figure 16
Figure 15
Figure 18
Input Test Signal
Figure 19
Without Power Guard