Connector And Cable Information; Introduction; Performance Features - McIntosh MC255 Owner's Manual

Connector and Cable Information

XLR Connectors
Below is the Pin configuration for the XLR Balanced
Input, Input/Output Connectors on the MC255. Refer
to the diagram for connection:
PIN 1: Shield/Ground
PIN 2: + Input/Output
PIN 3: - Input/Output
Power Control Connector
The MC255 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 MC255
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).

Introduction

Now you can take advantage of traditional McIntosh
standards of excellence in the MC255 Power Ampli-
fier. This Five Channel Power Amplifier with high
current output will drive any pair of high quality
Loudspeakers. The MC255 reproduction is sonically
transparent and absolutely accurate. The McIntosh
Sound is "The Sound of the Music Itself."

Performance Features

• Power Output
The MC255 is a Five Channel Home Theater Power
Amplifier with a capability of 250 watts from the
IN
Front Three Channels (Left, Center and Right) and
200 watts from the Surround Channels (Left and
Right) into 4 or 8 ohm speakers with less than 0.005%
distortion. The Power Amplifier Circuitry uses Ther-
PIN 2 PIN 1
PIN 3 malTrak
cool operation.
• Balanced and Unbalanced Inputs
Balanced connections guard against induced noise and
allow long cable runs without compromising sound
Trigger
Control
quality.
Meter
Illumination
• Power Guard
Control
Ground
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 MC255 provides Two Channel
Music Playback in a second room with 200 watts
per channel, while at the same time Zone A provides
Three Channel Home Theater Playback.
3/10 of an inch
(7.6millimeters)
• Sentry Monitor and Thermal Protection
McIntosh Sentry Monitor power output stage protec-
tion circuits ensure the MC255 will have a long and
trouble free operating life. Built-in Thermal Protection
Circuits guard against overheating.
ThermalTrak™ and ON Semiconductor are trademarks of Semi-
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conductor Components Industries, LLC
Cable Information, Introduction and Performance Features
Output Transistors for lower distortion and
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• 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
MC255 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 MC255 will be
retained for many years.
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