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15

Technical Description, con’t

Figure 18

With Power Guard

Figure 17

Without Power Guard

able, since it can damage

valuable loudspeaker sys-

tem tweeters. You will

never experience the

harsh and damaging dis-

tortion due to clipping.

The Power Guard cir-

cuit is a waveform com-

parator, monitoring both

the input and output

waveforms. Under nor-

mal operating conditions,

there are no differences

between the shape of

these waveforms. If an amplifier channel is overdriven,

there will be a difference between the two signal wave-

forms. When the difference exceeds 0.3% (equivalent to

0.3% harmonic distor-

tion), the Power Guard

activates the PG light and

a dynamic electronic at-

tenuator at the amplifier

input reduces the input

volume just enough to

prevent any further in-

crease in distortion. The

Power Guard circuit acts

so fast that there are ab-

solutely no audible side

effects and the sonic pu-

rity of the music repro-

duction is perfectly pre-

served. The MC1201 Power Amplifier with Power Guard

is not limited to just the rated power output, but will actu-

ally produce distortion free output well above its rated

power due to the McIntosh philosophy of conservative de-

sign.

Power Supply Circuits

To compliment the fully balanced design of the MC1201

there are two high voltage power supplies; one for each of

the two amplifier circuits, allowing each amplifier circuit

to be optimized using its own power supply. Refer to figure

19. High power amplifiers draw high current from the AC

power line. Therefore, it is important that they plug directly

into the wall outlet.

Also, most owners desire that there be one power

switch for the whole audio system. The MC1201 is

equipped with a circuit that provides remote Power Control

from your McIntosh Preamplifier or Control Center. When

you turn on your preamplifier a digital “1” (+5V) signal

operates the power relay in the MC1201. The MC1201 also

has a remote Power Control Out Jack. The Power Control

signal from this jack is delayed by a fraction of a second so

that the turn on power surge of the next power amplifier

occurs at a later time. This helps prevent power circuit

overload that could trip circuit breakers or blow fuses, a

very important feature in a high power Home Theater Sys-

tem employing three MC1201 Power Amplifiers.

The MC1201 can provide greater than 200 amperes

peak output current to drive uneven speaker loads. Some

poor speaker designs have input impedance that dip to 1 or

2 ohms at various frequencies and the MC1201 has the out-

put current reserve to drive them. It can deliver over 1,000

Watts Output on tone bursts. The MC1201 has huge main

filter capacitors that guarantee an excellent signal to noise

ratio and the energy storage necessary for the wide dy-

namic range that “Digital Audio” demands.

Figure 19

Block Diagram

of the

Power Supply

Содержание MC1201

Страница 1: ...McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 FAX 607 724 0549 Owner s Manual MC1201 MC1201 Power Amplifier...

Страница 2: ...tacle or other outlet unless the blades can be fully in serted to prevent blade exposure Attention pour pevenir les chocs elecriques pas utiliser cette fiche polarisee avec un prolongateur une prise d...

Страница 3: ...ck or other hazards 26 Upon completion of any service or repairs to this prod uct ask the service technician to perform safety checks to determine that the product is in proper operating condition Cus...

Страница 4: ...less than 0 005 distortion Full Balanced Circuity The MC1201 is fully balanced from inputs to outputs It consists of two matched power amplifiers operating in push pull with their outputs combined in...

Страница 5: ...is additional infor mation on the next page pertaining to installing the MC1201 into cabinets 17 3 4 45 09cm 11 27 94cm 12 5 16 31 27cm 18 45 72cm 19 1 2 49 50cm 3 16 0 48cm 10 1 2 26 70cm 14 35 60cm...

Страница 6: ...If all the com ponents are installed in a single cabinet a quiet running venti lation fan can be a definite as set in maintaining all the sys tem components at the coolest possible operating temperatu...

Страница 7: ...cable from a preamplifier or control center audio output POWER CONTROL IN receives turn On Off signals from a McIntosh component and the POWER CONTROL OUT sends a turn On Off signal to the next McInto...

Страница 8: ...into the terminal so the wires cannot slip out Re fer to figures 4 5 6 Banana plug connection Insert the banana plug into the hole at the top of the terminal Tighten the top portion of the terminal p...

Страница 9: ...Outlet 4 ohm Loudspeaker McIntosh C200C Controller McIntosh C200P Preamplifier Caution The Loudspeaker Negative Connections are above chassis ground Do not combine any connections together ground the...

Страница 10: ...he amplifier METER Switch selects the display modes of the Power Output Meter POWER GUARD LED lights when the amplifier POWER GUARD circuit activates POWER Switch Turns AC power On Off or On Remote Re...

Страница 11: ...pro duced by the am plifier They indicate to an accuracy of at least 95 of the power output with only a single cycle of a 2000Hz tone burst Hold The meter pointer is locked to the highest power peak i...

Страница 12: ...ever manufactured The distortion limits for the MC1201 are no more than 0 005 at rated power output for all frequencies from Top View of the MC1201 20Hz to 20 000Hz Typical performance at mid frequen...

Страница 13: ...metal film resistors and low dielectric ab sorption film capacitors are used in all critical circuit loca tions Figure 12 The output signals of the two balanced circuits are coupled together in the u...

Страница 14: ...the upward direction When the pointer reaches its peak it pauses only long enough for the human eye to perceive its position then drops It is almost 10 times faster than a pro fessional VU meter A fro...

Страница 15: ...the two amplifier circuits allowing each amplifier circuit to be optimized using its own power supply Refer to figure 19 High power amplifiers draw high current from the AC power line Therefore it is...

Страница 16: ...16...

Страница 17: ...17 Notes...

Страница 18: ...ntermodulation Distortion Maximum Intermodulation Distortion if instanta neous peak output does not exceed twice the rated output for any combination of frequencies from 20Hz to 20 000Hz is 0 005 for...

Страница 19: ...l result in shipping damage Use the original shipping carton and interior parts only if they are all in good serviceable condition If a shipping carton or any of the interior part s are needed please...

Страница 20: ...McIntosh Part No 040727 McIntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903...

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