McIntosh MC257 Handleiding
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McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 www.mcintoshlabs.com
MC257
Power Amplifier
Owner’s Manual
2
Your decision to own this McIntosh MC257 Seven
Channel Power Amplifier ranks you at the very top
among discriminating music listeners. You now have
“The Best.” The McIntosh dedication 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 pos-
sible with all the features and functions of your new
McIntosh.
Copyright 2019 © by McIntosh Laboratory, Inc.
Table of Contents
Thank You
Please Take A Moment
Technical Assistance
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 additional help concerning a suspected problem,
you can receive technical assistance for all McIntosh
products at:
McIntosh Laboratory, Inc.
2 Chambers Street
Binghamton, New York 13903
Phone: 607-723-3512
Fax: 607-724-0549
Customer Service
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 assistance 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
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:
Serial Number: _______________________________
Purchase Date: _______________________________
Dealer Name: ________________________________
Important Safety Information is supplied in a separate document “Important Additional Operation Information Guide”
Safety Instructions .....................................................
2
(Separate Sheet) ...................
Important Additional
Operation Information Guide
Thank You and Please Take a Moment 2
.......................
Technical Assistance and Customer Service 2
..............
Table of Contents 2
........................................................
General Information ...................................................
2
Connector and Cable Information ..............................
3
Introduction .................................................................
3
Performance Features .................................................
3
Dimensions .................................................................
4
Installation ..................................................................
5
Rear Panel Connections and Switch 6
...........................
Output Terminals and How to Connect ...................
7-8
Connection Diagram (Separate Sheets) ....
Mc1A-3A
Front Panel Displays and Controls ............................
10
How to Operate .........................................................
11
Technical Description ..........................................
12-15
Photos ...................................................................
16-17
Specifications ............................................................
18
Packing Instruction ...................................................
19
1. For additional connection information, refer to the
owner’s manual(s) for any component(s) connected
to the MC257.
2. The MC257 mutes the speaker output for approxi-
mately two seconds when first turned on.
3. For the best performance and safety it is important
to always match the impedance of the Loudspeaker
to the Power Amplifier connections. Refer to “How
to Connect” pages 7 and 8.
Note: The impedance of a Loudspeaker actually var-
ies as the Loudspeaker reproduces different
frequencies. As a result, the nominal impedance
rating of the Loudspeaker (usually measured at
a midrange frequency) might not always agree
with the impedance of the Loudspeaker at low
frequencies where the greatest amount of power
is required. Contact the Loudspeaker Manufac-
turer for additional information about the actual
impedance of the Loudspeaker before connecting
it to the McIntosh MC257.
4 In the event the MC257 over heats, due to improper .
ventilation and/or high ambient temperature, the
protection circuits will activate. The Front Panel
Power Guard LED will continuously indicate ON
and the audio will be muted. When the MC257 has
returned to a safe operating temperature, normal
operation will resume.
5. When discarding the unit, comply with local rules
or regulations. Batteries should never be
thrown away or incinerated but disposed
of in accordance with the local regulations
concerning battery disposal.
6. For additional information on the MC257 and
other McIntosh Products please visit the McIntosh
Website at www.mcintoshlabs.com.
General Information
3
XLR Connectors
The MC257 has different Pin Configurations for the
Input and Output XLR Connectors, refer to the follow-
ing connections:
PIN 1: Shield/Ground
PIN 2: + Input/Output
PIN 3: - Input/Output
Power Control Connector
The MC257 Power Control Input receives an On/Off
signal from +5 to +12 volts. The Power Control Output
will in turn provide a +12 volt
Output Signal with a total cur-
rent up to 50mA. An additional
connection is for controlling
the illumination of the MC257
Power Output Meters. The 1/8
inch stereo mini phone plug connects to a McIntosh
Preamplifier or A/V Control Center Power Control
Output.
Output Terminal Connector
When cables with spade lugs are used
for Loudspeaker Connection, the spade
lugs need an opening of at least 3/10 inch
(7.6mm).
Cable Information, Introduction and Performance Features
Connector and Cable Information
Introduction
Now you can take advantage of traditional McIntosh
standards of excellence in the MC257 Power Ampli-
fier. This Seven Channel Amplifier with high current
output will drive any set of high quality Loudspeak-
ers. The MC257 reproduction is sonically transparent
and absolutely accurate. The McIntosh Sound is “The
Sound of the Music Itself.”
Performance Features
• Power Output
The MC257 is a Seven Channel Power Amplifier
with a capability of 250 Watts from the Front Three
Channels (Left, Center & Right) and 160 Watts from
the Surround Channels into speakers with less than
0.005% distortion. The Power Amplifier Circuitry
uses ThermalTrak1 Output Transistors for lower dis-
tortion and cool operation.
• Balanced and Unbalanced Inputs
Balanced connections guard against induced noise and
allow long cable runs without compromising sound
quality.
• Power Guard
The patented McIntosh Power Guard circuit prevents
the amplifier from being over driven into clipping,
with its harsh distorted sound that can also damage
your valuable loudspeakers.
• Zone B Operation
The Zone B on the MC257 provides Two Channel
Music Playback in a second room with 160 watts per
channel, while at the time Zone A provides Five Chan-
nel Home Theater Playback.
• Sentry Monitor and Thermal Protection
McIntosh Sentry Monitor power output stage protec-
tion circuits ensure the MC257 will have a long and
trouble free operating life. Built-in Thermal Protection
Circuits guard against overheating.
• Special Power Supply
A very large Power Transformer and Large Capaci-
tors ensure stable noise free operation even though the
power line varies.
• Illuminated Power Meters
The Illuminated Power Output Watt Meters on the
MC257 are peak responding, and indicate the true
power output of the amplifier. The Front Panel Meter
Illumination may be switched Off at any time.
• McIntosh Custom Binding Posts
McIntosh patent pending gold plated output terminals
deliver high current output. They accept large diam-
eter wire and spade lugs. Banana plugs may also be
used only in the United States and Canada.
• Glass Front Panel and Super Mirror Chassis
Finish
The famous McIntosh Illuminated Glass Front Panel
uses long life Light Emitting Diodes (LEDs) and
the Stainless Steel Chassis with Super Mirror Fin-
ish ensures the pristine beauty of the MC257 will be
retained for many years.
1 ThermalTrak™ and ON Semiconductor are trademarks of Semi-
conductor Components Industries, LLC
Trigger
Control
Ground
Meter
Illumination
Control
PIN 2 PIN 1
PIN 3
IN
3/10 of an inch
(7.6millimeters)
Product specificaties
| Merk: | McIntosh |
| Categorie: | Receiver |
| Model: | MC257 |
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