Table Of Contents; Safety First; Introduction - McIntosh MC451 Owner's Manual

Dual mono power amplifier

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Table Of Contents

Table of Contents

Thank You from All of Us at McIntosh

You have invested in a precision instrument that

will provide you with many years of enjoyment.

Please take a few moments to familiarize yourself

with the features and instructions to get the maxi-

mum performance from your MC451.

If you need further technical assistance, please

contact your dealer who may be more familiar with

your particular setup including other brands. You

can also contact McIntosh with additional questions

or in the unlikely event of needing service.

McIntosh Laboratory, Inc�

2 Chambers Street

Binghamton, New York 13903

Technical Assistance

Fax

Customer Service

Fax

support@mcintoshlabs.com

Website

www.mcintoshlabs.com

Please Take A Moment

For future reference, you can write down your

serial number and purchase information here. We

can identify your purchase from this information

if the occasion should arise:

Serial Number: __________________________

Purchase Date: ___________________________

Dealer Name: ___________________________

Safety First �� 2

Introduction�� 2

Where to Put It� �� 3

Dimensions �� 3

Removal of Foam Insert Over Vacuum Tubes �� 4

Connector Information �� 5

Connecting a Loudspeaker � �� 5

Front Panel Displays and Knobs �� 6-7

Rear Panel Connections and Switches �� 8-9

Connection Diagram �� 10-11

Setting Up the Crossover� �� 12-13

Solid State Specifications �� 14

Vacuum Tube Specifications �� 14

General Specifications� �� 14

(607) 723-3512

Packing Instructions �� 15

(607) 724-0549

Packaging Parts List �� 15

(607) 723-3515

(607) 723-1917

Safety First

Please read the safety instructions included in a

separate document called Important Additional

Operation Information Guide.

Introduction

The MC451 Dual Mono Amplifier

is an all-in-one solution for bi-amping

loudspeakers. Utilizing our Hybrid

Drive™ technology, it captures

the harmonic beauty of vacuum tubes for a

loudspeaker's mid and high ranges while still having

an abundance of power dedicated to the low end. The

MC451 does the work of two separate amplifiers with

its optimized combination of a vacuum tube and a

solid state amplifier in a single optimized instrument.

Introduction (continued)

The MC451 has 150 watts of vacuum tube power

to drive your loudspeaker's mid ranges and tweeters.

With the MC451, the tubes will not be challenged

or overloaded by low-end reproduction because the

solid state section has 300 watts dedicated to driving

the woofers.

Fine tuning your system is made simple with the

built-in crossover. This allows you to match the

crossover point to your loudspeakers and maximize

the power available to each section. Alternatively,

you can connect a direct feed to each amplifier

section and bypass the crossover. This is perfect if

you have crossovers external to the MC451.

The solid state amplifier features Power Guard

for clipping protection, Sentry Monitor™ for

over current protection, and ThermalTrak

transistors for stable bias and temperature control.

The output Autoformer™ provides the full 300W

of power regardless of loudspeaker impedance and

provides DC protection to the outputs.

The vacuum tube amplifier features Power

Guard SGS

Monitor™ for over current protection. The Unity

Coupled Output Transformer™ provides the full

150W of power regardless of loudspeaker imped-

ance and provides DC protection to the outputs.

Actual size = .625" square

ThermalTrak™ is a trademark of Semiconductor

Components Industries, LLC

Hybrid Drive logo FINAL 2022.ai

for output tube protection and Sentry

output

Table of Contents

Table Of Contents; Safety First; Introduction - McIntosh MC451 Owner's Manual