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 ampliers does not exist with this
new design.
The high efciency 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 amplier 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 amplier 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 amplier
into clipping.
Refer to gures
18, 19 and 20.
An overdriven
amplier 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