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Customer Service

Technical Assistance

Please Take A Moment

Thank You

Copyright 2003 

 by McIntosh Laboratory, Inc.

The serial number, purchase date and McIntosh Dealer
name are important to you for possible insurance claim or
future service. The spaces below have been provided for
you to record that information:

Your decision to own this McIntosh MC252 Power Ampli-
fier ranks you at the very top among discriminating music
listeners. You now have “The Best.” The McIntosh dedica-
tion to “Quality,” is assurance that you will receive many
years of musical enjoyment from this unit.

Please take a short time to read the information in this

manual. We want you to be as familiar as possible with all
the features and functions of your new McIntosh.

Serial Number:

Purchase Date:

Dealer Name:

If it is determined that your McIntosh product is in need of
repair, you can return it to your Dealer. You can also return
it to the McIntosh Laboratory Service Department. For as-
sistance on factory repair return procedure, contact the
McIntosh Service Department at:

McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-3515
Fax: 607-723-1917

If at any time you have questions about your McIntosh
product, contact your McIntosh Dealer who is familiar with
your McIntosh equipment and any other brands that may
be part of your system. If you or your Dealer wish addi-
tional help concerning a suspected problem, you can re-
ceive technical assistance for all McIntosh products at:

McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-1545
Fax: 607-723-3636

Table of Contents

Important Information

Caution: The MC252 Amplifier weight is 94.5 pounds

(42.87 kilograms). It requires two or more persons
to safely handle when moving the amplifier.

1. The following Connecting Cable is available from the

McIntosh Parts Department:

Power Control Cable Part No. 170-202

Six foot, 2 conductor shielded, with two 1/8 inch stereo
mini phone plugs.

2. For additional connection information, refer to the owner’s

manual(s) for any component(s) connected to the MC252.

3. The MC252 mutes the speaker outputs for approximately two

seconds when first turned on.

4. It is very important that loudspeaker cables of adequate size

be used, so that there will be no power loss. The size is
specified in Gauge Numbers or AWG, (American Wire Gauge).
The smaller the Gauge number, the larger the wire size:

If your loudspeaker cables are 50 feet (38.1m) or less,
use at least 14 Gauge.
If your loudspeaker cables are 100 feet (76.2m) or less,
use at least 12 Gauge.

5. In the event the MC252 over heats, due to improper

ventilation and/or high ambient temperature, the protection
circuits will activate. The Power Guard LED will stay ON and
the audio will be muted. When the MC252 has returned to a
safe operating temperature, normal operation will resume.

Safety Instructions ............................................................ 2
Thank You and Please Take a Moment ............................. 3
Technical Assistance and Customer Service .................... 3
Table of Contents and Important Information .................. 3
Connector Information ..................................................... 4
Introduction ...................................................................... 4
Performance Features ....................................................... 4
Dimensions ....................................................................... 5
Installation ........................................................................ 6
Top Panel Connections and Switch .................................. 7
How to Connect in Stereo ................................................. 8
How to Connect in Mono Bridged Mode ....................... 10
How to Connect in Mono Bi-Amp (Parallel) ................. 12
Front Panel Displays and Controls ................................. 14
How to Operate ............................................................... 15
Technical Description ..................................................... 16
Notes ............................................................................... 20
Specifications ................................................................. 22
Packing Instruction ......................................................... 23

Содержание MC252

Страница 1: ...MC252 Owner s Manual McIntosh Laboratory Inc 2 Chambers Street Binghamton New York 13903 2699 Phone 607 723 3512 FAX 607 724 0549 Power Amplifier...

Страница 2: ...polarized plug has two blades with one wider than the other A grounding type plug has two blades and a third grounding prong The wide blade or the third prong are provided for your safety If the prov...

Страница 3: ...x 607 723 3636 Table of Contents Important Information Caution The MC252 Amplifier weight is 94 5 pounds 42 87 kilograms It requires two or more persons to safely handle when moving the amplifier 1 Th...

Страница 4: ...mponents Positive N C Ground Balanced and Unbalanced Inputs Balanced connections guard against induced noise and al low long cable runs without compromising sound quality Patented Sentry Monitor with...

Страница 5: ...MC252 There is additional informa tion on the next page pertaining to installing the MC252 into cabinets 17 1 2 44 45cm 8 13 16 22 38cm Front View of the MC252 Rear View of the MC252 Side View of the...

Страница 6: ...fier If all the components are in stalled in a single cabinet a quiet running ventilation fan can be a definite asset in maintaining all the system components at the coolest possible operating tempera...

Страница 7: ...se holder refer to information on the top back panel of the MC252 to determine the cor rect fuse size and rating POWER CONTROL IN receives a turn On Off Trigger from a McIntosh component POWER CONTROL...

Страница 8: ...l so the wires cannot slip out Refer 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 post and the set sc...

Страница 9: ...9 How to Connect in Stereo To AC Outlet 4 ohm Loudspeaker McIntosh C45 Audio Control Center MC252 Top Rear View 4 ohm Loudspeaker...

Страница 10: ...or banana connector Spade lug or prepared wire connection Insert the spade lug connector or prepared section of the cable end into the terminal side access hole and tighten the terminal cap until the...

Страница 11: ...okup Connections Loudspeaker Impedance Loudspeaker Negative Connection Loudspeaker Positive Connection 4S Ohm Left Output 2S Positive Connection Right Output 2S Positive Connection 8S Ohm Left Output...

Страница 12: ...r to figures 1 2 3 If the cable wire is stranded carefully twist the strands together as tightly as possible Note If desired the twisted ends can be tinned with solder to keep the strands together or...

Страница 13: ...Outlet 4 ohm Loudspeaker McIntosh C45 Audio Control Center MC252 Top Rear View Jumper Wires additional instruction on making Loudspeaker Connections contact your McIntosh Dealer or McIntosh Technical...

Страница 14: ...er POWER GUARD LED lights when the amplifier Right Channel POWER GUARD circuit activates POWER Switch Turns AC power On Off or On Remote Remote On Indicator lights when the amplifier is in the Remote...

Страница 15: ...e of a 2000Hz tone burst Hold The meter pointer is locked to the highest power peak in a sequence of peaks It is elec tronically held to this power level until a higher power peak passes through the a...

Страница 16: ...The MC252 can deliver the best possible perfor mance from any type of high quality loudspeaker system Creating an amplifier with this level of performance did not come easily Many months of design te...

Страница 17: ...000Hz with optimum imped ance points of two ohms four ohms and eight ohms The unequaled expertise of McIntosh in the design and manu facturing of autoformers is legendary in the high fidelity industr...

Страница 18: ...omise in sonic perfor mance with this circuit and it ensures safe op eration of the amplifier under even the most extreme operating condi tions The different types of protection circuits incorpo rated...

Страница 19: ...MC252 is equipped with a circuit that provides remote Power Control from Figure 20 Block Diagram of the Power Supply your McIntosh Preamplifier or Control Center When you turn on your preamplifier a...

Страница 20: ...20...

Страница 21: ...21 Notes...

Страница 22: ...on Distortion if instanta neous peak output per channel does not exceed twice the rated output for any combination of fre quencies from 20Hz to 20 000Hz with all channels operating is 0 005 Dynamic He...

Страница 23: ...he equipment must be packed exactly as shown below It is very important that the four plastic feet are at tached to the bottom of the equipment Three 10 x 2 1 2 inch screws and washers must be used to...

Страница 24: ...ntosh Laboratory Inc 2 Chambers Street Binghamton NY 13903 The continuous improvement of its products is the policy of McIntosh Laboratory Incorporated who reserve the right to improve design without...

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