McIntosh MC152 Manuel du propriétaire télécharger pdf (Page 15)

The output signal of the amplifier circuit is coupled

into the unique McIntosh MC152 Output Autoformer.

It provides low distortion power transfer at frequen-

cies from below 20Hz to well beyond 20,000Hz with

optimum impedance points of two ohms, four ohms

and eight ohms. The unequaled expertise of McIntosh

in the design and manufacturing of autoformers is leg-

endary in the high fidelity industry. Refer to figure 17.

The Autoformer

creates an ideal match

between the power am-

plifier output stage and

the loudspeaker. Refer to

fig ure 18.

There is absolutely no

performance limitation

with an Autoformer. Its

frequency response ex-

ceeds that of the output

circuit itself, and extends

well beyond the audible

range. Its distortion level

is so low it is virtually

impossible to measure.

The high efficiency circuit design of the MC152

contributes to low operating temperatures. More than

800 square inches of heat sink area keep the MC152

operating safely with convection cooling. No fans are

needed.

Autoformers

All solid state power amplifier output circuits work

best into what is called an optimum load. This op-

timum load may vary considerably from what a

loudspeaker requires. In the case of more than one

loudspeaker connected in parallel, the load to the

power amplifier may drop to two ohms or even less. A

power amplifier connected to a load that is lower than

optimum, causes more output current to flow, which

results in extra heat being generated in the power out-

put stage. This increase in temperature will result in a

reduced life expectancy for the amplifier.

Technical Description

Figure 18

Block Diagram of the Power Amplifier

(one channel shown)

Figure 15

ThermalTrak

DC BIAS

OUTPUT

MUTE

THERMAL

SENSORS

BALANCED

AMP

POWER GUARD

ATTENUATOR

INPUT MODE

SWITCH

AMP

UNBALANCED

INPUT

BALANCED

INPUT

com

Figu re 17

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

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McIntosh MC152 Manuel du propriétaire Page 15

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