McIntosh MC303 User Manual

Page 4

XLR Connectors

Below is the Pin configuration for the XLR Balanced Input

Connectors on the MC303. Refer to the diagram for con-

nection:

PIN 1: Shield/Ground

PIN 2: + Output

PIN 3: - Output

Power Control Connector

The MC303’s Power Control Inputs receive On/Off signals

of +5 volts. An additional connection

is for controlling the illumination of

the MC303 Power Output Meters.

The 1/8 inch stereo mini phone plug

connects to a McIntosh A/V Control

Center Power Control Output.

Note: The Power Control Connecting Cable is available from

the McIntosh Parts Department:

Data and Power Control Cable Part No. 170-202

Six foot, shielded 2 conductor, with 1/8 inch stereo mini

phone plugs on each end.

Connector Information, Introduction and Performance Features

Connector and Cable Information

Introduction

Performance Features

PIN 2

PIN 1

PIN 3

Power

Control

Meter

Illumination

Control Ground

Now you can take advantage of traditional McIntosh

standards of excellence in the MC303 Power Amplifier.

The 300 watt high current output per channel will drive

any high quality loudspeaker system to its ultimate per-

formance. The MC303 reproduction is sonically transpar-

ent and absolutely accurate. The McIntosh Sound is “The

Sound of the Music Itself.”

• Power Output

The MC303 is a Power Amplifier with a capability of 300

watts per channel (all channels driven) into 2, 4 or 8 ohm

speakers with less than 0.005% distortion. The Power Am-

plifier circuitry uses Thermal Trak

Output Transistors for

lower distortion and cool operation.

• Balanced and Unbalanced Inputs

Balanced connections guard against induced noise and al-

low 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.

• Sentry Monitor and Thermal Protection

McIntosh Sentry Monitor power output stage protection

circuits ensure the MC303 will have a long and trouble free

operating life. Built-in Thermal Protection Circuits guard

against overheating.

• Patented Autoformer

McIntosh designed and manufactured Output Autoformers

provide an ideal match between the amplifier output stages

and speaker loads of 2, 4 and 8 ohms. The Autoformers

also provide perfect DC protection for your valuable loud-

speakers.

• Special Power Supply

A regulated Power Supply, a very large Power Transformer

and Capacitors ensure stable noise free operation even

though the power line varies.

• Illuminated Power Meter

The Illuminated Power Output Watt Meter on the MC303

is peak responding, and indicates the power output of the

amplifier. The Front Panel Meter Illumination may be

switched Off at any time.

• Fiber Optic Solid State Front Panel Illumination

The even illumination of the Front Panel is accomplished

by the combination of custom designed Fiber Optic Light

Diffusers and extra long life Light Emitting Diodes

(LEDs).

• Glass Front Panel and Super Mirror Chassis Finish

The famous McIntosh Illuminated Glass Front Panel and

the Stainless Steel Chassis with Super Mirror Finish en-

sures the pristine beauty of the MC303 will be retained for

many years.

ThermalTrak™ and ON Semiconductor are trademarks of Semicon-

ductor Components Industries, LLC

General Information, con’t

6. 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 dis-

posal.

7. For additional information on the MC303 and other

McIntosh Products please vist the McIntosh Web

Site at www.mcintoshlabs.com.

8. When the MC303 is operated in the USA or Canada and the

main fuse, located on the rear panel, is in need of replace-

ment use only the following part:

Bussman ABC-15-R or Littlefuse 314-015P