McIntosh MC207 User Manual
Page 18
18
Figure 17
ohm speakers, with their high current demand. Additionally,
the MC207 can be used with 8 ohm speakers, and deliver
equal power. McIntosh’s new DPM
TM
design enables it to
run on higher voltage rails when connected to less current-
hungry 8 ohm speakers and still deliver 200 watts. The
power penalty usually paid with 8 ohm speakers on high
current amplifiers does not exist with this new design.
The high efficiency circuit design of the MC207 contrib-
utes to low operating temperatures. More than 2625 square
inches of
heat sink
area occu-
pies al-
most half
of the
MC207’s
chassis
space and
keeps the
amplifier
operating
safely with
convection
cooling.
No fans
are
needed.
Refer to
figure 16.
Protection
Circuits
The MC207 incorporates its version of the McIntosh Sentry
Monitor output transistor protection circuit. Refer to figure
17. There is absolutely no compromise in sonic performance
with this circuit,
and it ensures
safe operation of
the amplifier un-
der even the
most extreme
operating condi-
tions. The differ-
ent types of pro-
tection circuits
incorporated in
the MC207 in-
sure a long and
safe operating
life.
The MC207
also includes the
unique patented
McIntosh Power
Guard circuit.
Power Guard
eliminates the
possibility of
ever overdriving
the amplifier
into clipping.
Refer to figures
18, 19 and 20.
An overdriven
amplifier can
produce both
audible and in-
audible distor-
tion levels ex-
ceeding 40%.
The audible dis-
tortion is un-
pleasant to hear,
but the inaudible
ultrasonic distor-
tion is also un-
desirable, since
it can damage
valuable Loud-
speaker System
tweeters. You
will never expe-
Figure 16
Figure 15
Figure 18
Input Test Signal
Figure 19
Without Power Guard