Protection Circuits

Figure 16

Figure 15

The MC207 can easily drive 4 ohm speakers, with their high current demand. Additionally, the MC207 can be used with 8 ohm speakers, and deliver equal power. McIntosh’s new DPMTM 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 con- tributes to

low oper- ating tem- peratures. 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 con- vection

cooling. No fans are needed. Refer to figure 16.

The MC207 incorporates its version of the McIntosh Sen- try Monitor out-

put transistor protection cir- cuit. Refer to figure 17. There is absolutely no

compromise in sonic perfor-

mance with this circuit, and it ensures safe op- eration of the

	amplifier under	Figure 17
	even the most	Input Test Signal
	extreme operat-	Input Test Signal
	extreme operat-
	ing conditions.
	The different
	types of protec-
	tion circuits in-
	corporated in
	the MC207 in-
	sure a long and
	safe operating
	life.
	The MC207
	also includes the
	unique patented
	McIntosh Power
	Guard circuit.
	Power Guard	Figure 18
	eliminates the
	possibility of	Without Power Guard
	ever overdriving	Without Power Guard
	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,	Figure 19
		Figure 19