Krell Industries 400cx, 350Mcx, 450Mcx, 700cx manual Full Power Balanced Series Power Amplifiers

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Full Power Balanced

X Series Power Amplifiers

700cx, 400cx, 300cx Stereo

Krell Industries, Inc.

45 Connair Road

Orange, CT 06477-3650 USA

750Mcx, 450Mcx,

TEL 203-799-9954

FAX 203-891-2028

350Mcx Monaural

E-MAIL krell@krellonline.com

 

with Krell CAST II Technology

WEBSITE http://www.krellonline.com

v 02.0

 

This product complies with the EMC directive (89/336/EEC) and the low-voltage directive (73/23/EEC).

WARNINGS

The Full Power Balanced amplifier must be placed on a firm, level surface where it is not exposed to drip- ping or splashing.

The ventilation grids on the top of the Full Power Balanced amplifier must be unobstructed at all times during operation. Do not place flammable material on top of or beneath the component.

Before making connections to the Full Power Balanced amplifier, ensure that it is off and the preamplifier is in mute or stand-by mode. Make sure all cable terminations are of the highest quality and free from frayed ends, short circuits, or cold solder joints.

The differential circuitry employed with Full Power Balanced amplifiers requires special attention when connect- ing speakers. Do not connect the negative speaker terminals together. Do not connect the negative speaker ter- minals to ground or attempt to bridge the left and right speaker binding posts of Full Power Balanced stereo ampli- fiers.

Do not connect a Full Power Balanced amplifier to a speaker selector device that employs a common ground scheme, as it may short-circuit the amplifier output.

THERE ARE NO USER SERVICEABLE PARTS INSIDE ANY KRELL PRODUCT.

Please contact your authorized Krell dealer, distributor, or Krell if you have any questions not addressed in this reference manual.

This product is manufactured in the United States of America. Krell® is a registered trademark of Krell Industries, Inc., and is restricted for use by Krell Indus- tries, Inc., its subsidiaries, and authorized agents. Sustained Plateau Bias III™ is a trademark of Krell Industries, Inc. and is a Krell technology based on U.S. Patent No. 5,331,291. CAST™, CAST II™, Krell Current Mode™, Krell Link™, and Krell Playback System™ are trademarks of Krell Industries, Inc. All other trademarks are registered to their respective companies.

© 2002 by Krell Industries, Inc. All rights reserved

P/N 305976

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Contents Full Power Balanced Series Power Amplifiers Instructions for Use Owner’s ReferenceFull Power Balanced Series Power Amplifiers Contents Illustrations Introduction ConfigurationsKrell Current Audio Signal Transmission Cast Krell LinkTechnology Definition of TermsOperation Cast Basics How Cast and Krell Current Mode InteractCast a New Approach Cast Cable ConstructionUnpackingPlacement Olutionary Krell Cast and Cast II TechnolPlacement AC Power GuidelinesFull Power Balanced Stereo Amplifier Front Panel Full Power Balanced Monaural Amplifier Front Panel Front Panel Description Stereo Power AmplifiersMonaural Power Amplifiers Full Power Balanced Stereo Amplifier Back Panel Full Power Balanced Monaural Amplifier Back Panel Back Panel Description Speaker Binding Posts Power AmplifiersHandle Krell Cast InputKrell Link Connections Connecting the Full Power Balanced Amplifier to Your SystemInput and Output Connections DC Protection Circuitry ConnectingUsing a Tube Preamplifier Amplifier Operation Krell Link OperationHOW to Turn on Remote Control OperationHOW to Turn OFF HOW to Switch Between Krell Cast and XLR InputsHOW to Evaluate Amplifier Operation Amplifier TroubleshootingHOW to Troubleshoot System Noise Model, see Using a Tube Preamplifier, on Questions and Answers Warranty Return Authorization Procedure Specifications Full Power Balanced 300cx, 400cx, 700cx Stereo AmplifiersFPB 350Mc FPB 450Mc FPB 750Mc Full Power Balanced X Series Power Amplifiers

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.