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

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Amplifier Operation

Full Power Balanced amplifiers are easy to install and operate. However, it is important to exercise care during operation, due to the amplifiers’ enormous power output. Switching between active sources (such as a CD player, tape monitor, or VCR) without muting the pre- amplifier output, or bumping or miscuing a source can generate large transients at low fre- quencies. Full Power Balanced amplifiers may generate enough power with these transients to damage loudspeakers.

IMPORTANT

Always mute or fully attenuate the preamplifier level when switching sources.

Do not change input connections to the amplifi- er when the amplifier is on.

Use care when setting high playback levels. Because of their tremendous reserves of clean power, Full Power Balanced amplifiers can safe- ly drive speakers to higher sound pressure lev- els than other amplifiers. Always lower the vol- ume level at the first sign of speaker distress.

ON/OFF AND STAND-BYOPERATION

When powering on any system, turn on ampli- fiers last. Turn off amplifiers first.

1.Move the back panel power breaker switch to the up position to engage the input cir- cuitry and place the amplifier into the stand- by mode. The front panel blue power stand- by LED illuminates.

2.Press the silver power button on the amplifi- er front panel. The blue regulator LED illumi- nates. Once the regulator provides power to the output stage, the blue bias LED illumi- nates. The Sustained Plateau Bias II system is now engaged. After the protection circuitry has confirmed that safe operating conditions exist, the input relays engage. You hear a click. The amplifier is ready for operation.

If the Krell CAST input is being used, the Krell CAST red LED illuminates and remains illuminated at all times during the stand-by or power on modes.

3.With the preamplifier muted or volume con- trol completely lowered, select a source. Increase the volume control to the desired listening level.

4.When turning off the system, mute or com- pletely lower the preamplifier volume, or place the Full Power Balanced amplifier in the stand-by power mode by pressing the power button on the front panel. It is now safe to turn off the rest of the system.

Note

For best performance of Full Power Balanced amplifiers, leave the back panel power breaker switch on at all times.

KRELL LINK OPERATION

1.When all components are linked, place each component in the stand-by mode by moving the back panel power breaker switch to the up position. This ensures that all components will be synchronized when signals from the control component are sent to the linked components in the system.

2.When the components are in stand-by, switch the control component to the opera- tional mode from the control component’s front panel or by using the component’s remote control.

The linked components switch to the oper- ational mode simultaneously.

A linked component can be switched between the operational mode and stand-by, individual- ly, from its front panel. Switching a linked com- ponent temporarily breaks the chain of linked components. To re-establish linked operation, return all components to stand-by.

Krell Full Power Balanced X Series Power Amplifiers

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Contents Instructions for Use Owner’s Reference Full Power Balanced Series Power AmplifiersFull Power Balanced Series Power Amplifiers Contents Illustrations Krell Link ConfigurationsKrell Current Audio Signal Transmission Cast IntroductionOperation Definition of TermsTechnology Cast Cable Construction How Cast and Krell Current Mode InteractCast a New Approach Cast BasicsOlutionary Krell Cast and Cast II Technol UnpackingPlacementAC Power Guidelines PlacementFull 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 Krell Cast Input Power AmplifiersHandle Speaker Binding PostsInput and Output Connections Connecting the Full Power Balanced Amplifier to Your SystemKrell Link Connections Using a Tube Preamplifier ConnectingDC Protection Circuitry Krell Link Operation Amplifier OperationHOW to Switch Between Krell Cast and XLR Inputs Remote Control OperationHOW to Turn OFF HOW to Turn onHOW to Troubleshoot System Noise Amplifier TroubleshootingHOW to Evaluate Amplifier Operation Model, see Using a Tube Preamplifier, on Questions and Answers Warranty Return Authorization Procedure Full Power Balanced 300cx, 400cx, 700cx Stereo Amplifiers SpecificationsFPB 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.
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