Krell Industries 400cx, 350Mcx, 450Mcx, 700cx manual Model, see Using a Tube Preamplifier, on

Page 22

If the course of action listed in the table below does not correct the situation, please con- tact your authorized Krell dealer, distributor, or Krell.

AMPLIFIER CONDITION

POSSIBLE CAUSES

COURSE OF ACTION

 

The output mutes during

Excessive DC at the

Have source unit and

 

playback and the following

amplifier input

preamplifier checked for high

 

LEDs illuminate: Power

 

DC output

 

Stand-by, and

 

 

 

Regulator Bias

 

If preamplifier is a tube

 

 

 

model, see Using a Tube

 

 

 

Preamplifier, on page 14.

 

 

 

 

 

The amplifier switches to

Electrical short in speaker

Check all speaker cables for

 

stand-by mode and the

cables or inside speaker

any cuts or frayed edges that

 

Power Stand-by LED

 

might form a connection

 

illuminates

 

between the positive and neg-

 

 

 

ative speaker binding post ter-

 

 

 

minals

 

The amplifier switches to

Insufficient AC current from

stand-by at high volumes

the wall outlet

and the Power Stand-by

 

LED illuminates

 

Make sure the AC line is at least 15 amps for 300cx and 350Mc amplifiers; 400cx, 450Mcx, 700cx, and 750Mcx amplifiers should be operated from a dedicated 20-amp line.

Excessive heat

Allow amplifier to cool before

 

resuming operation. See

 

Placement, on page 4 for ven-

 

tilation requirements

The amplifier powers down

DC present at the output

completely and no LEDs

stage

illuminate

 

 

Internal amplifier problem

Contact your authorized Krell dealer, distributor, or Krell

Contact your authorized Krell dealer, distributor, or Krell

18

Krell Full Power Balanced X Series Power Amplifiers

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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 LinkOperation Definition of TermsTechnology 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 Monaural Power Amplifiers Stereo Power AmplifiersFront Panel Description Full Power Balanced Stereo Amplifier Back Panel Full Power Balanced Monaural Amplifier Back Panel Back Panel Description Speaker Binding Posts Power AmplifiersHandle Krell Cast InputInput and Output Connections Connecting the Full Power Balanced Amplifier to Your SystemKrell Link Connections Using a Tube Preamplifier ConnectingDC Protection Circuitry Amplifier Operation Krell Link OperationHOW to Turn on Remote Control OperationHOW to Turn OFF HOW to Switch Between Krell Cast and XLR InputsHOW to Troubleshoot System Noise Amplifier TroubleshootingHOW to Evaluate Amplifier Operation 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.