Contents

Page

INTRODUCTION

1

DEFINITION OF TERMS

1

REVOLUTIONARY KRELL CAST and CAST II TECHNOLOGY

3

UNPACKING

4

PLACEMENT

4

AC Power Guidelines

5

FRONT PANEL DESCRIPTION

8

700cx, 400cx, and 300cx Stereo Power Amplifiers

8

750Mcx, 450Mcx, and 350Mcx Monaural Power Amplifiers

8

BACK PANEL DESCRIPTION

11

700cx, 400cx, and 300cx Stereo Power Amplifiers

11

750Mcx, 450Mcx, and 350Mcx Monaural Power Amplifiers

12

CONNECTING THE FULL POWER BALANCED AMPLIFIER

 

TO YOUR SYSTEM

13

Input and Output Connections

13

Krell Link Connections

13

DC Protection Circuitry

14

Using a Tube Preamplifier

14

AMPLIFIER OPERATION

15

On/Off and Stand-by Operation

15

Krell Link Operation

15

REMOTE CONTROL OPERATION

16

How to Turn Off the Amplifier LEDs

16

How to Turn On the Amplifier LEDs

16

How to Switch between Krell CAST and XLR Inputs

16

Using a Dedicated Wall Outlet and Switch

16

AMPLIFIER TROUBLESHOOTING

17

How to Troubleshoot System Noise

17

How to Evaluate Amplifier Operation

17

QUESTIONS AND ANSWERS

19

WARRANTY

20

RETURN AUTHORIZATION PROCEDURE

21

SPECIFICATIONS

22

Krell Full Power Balanced X Series Power Amplifiers

iii

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Krell Industries 700cx, 400cx, 300cx, 750Mcx, 450Mcx, 350Mcx manual Contents

700cx, 400cx, 300cx, 750Mcx, 450Mcx, 350Mcx, 700cx, 400cx, 450Mcx, 350Mcx specifications

Krell Industries is renowned for its high-performance audio equipment, particularly its line of powerful amplifiers that deliver premium sound quality. Among these, the 450Mcx, 700cx, 400cx, 350Mcx, and 750Mcx models stand out for their robust capabilities and advanced technologies, making them popular choices for audiophiles.

The 450Mcx is a class AB power amplifier capable of delivering an impressive 450 watts per channel into 8 ohms. This model is equipped with Krell's signature current-mode topology, which ensures a high level of linearity and a dramatic reduction in distortion. With a heavy-duty construction, including a massive power supply, the 450Mcx offers deep bass response and engaging midrange clarity.

Next in line is the 700cx, which pushes boundaries with 700 watts per channel. This amplifier features Krell's Advanced Power Supply (APS) technology, enabling it to maintain stability even under the most demanding speaker loads. The result is explosive dynamics and captivating detail, delivering a listening experience that is both immersive and exhilarating.

The 400cx is designed for versatility, providing 400 watts per channel in a compact form. This model utilizes Krell's patented CAST technology, which minimizes signal degradation, ensuring that the audio signal retains its integrity from input to output. It is ideal for both home theater and stereo applications, allowing users to enjoy a rich sonic palette.

The 350Mcx, while delivering a powerful 350 watts per channel, is designed with a focus on reliability and heat dissipation. The dual-transformer design and sophisticated thermal management system ensure consistent performance, even during prolonged usage. It embodies Krell's commitment to sound fidelity and performance longevity.

The 750Mcx takes performance to the next level with remarkable output capabilities. This amplifier is built with multiple output devices in a high-current configuration, designed to drive even the most challenging loudspeakers. Its refined circuitry contributes to a soundstage that is both wide and deep, enriching the listening experience.

In addition to these models, Krell also offers the 300cx and the 350Mcx, both designed to cater to a variety of audio preferences and configurations. Each unit is meticulously engineered to deliver ultrasensitive dynamics and a transparency that brings recordings to life.

These Krell amplifiers not only emphasize power and performance, but they also showcase luxurious design and durability. The combination of advanced technologies, such as current mode and APS, ensures that users receive a premium audio experience that stands the test of time. Whether for professional use or high-end home listening, Krell amplifiers are truly an investment in quality sound.