Krell Industries 400cx, 350Mcx, 450Mcx, 700cx manual FPB 350Mc FPB 450Mc FPB 750Mc

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Specifications

Full Power Balanced 350Mcx, 450Mcx, 750Mcx Monaural Amplifiers

 

FPB 350Mc

FPB 450Mc

FPB 750Mc

FREQUENCY RESPONSE

20 Hz to 20 kHz

20 Hz to 20 kHz

20 Hz to 20 kHz

 

+0 dB, -0.05 dB

+0 dB, -0.05 dB

+0 dB, -0.05 dB

 

0.1 Hz to 240 kHz

0.1 Hz to 240 kHz

0.1 Hz to 240 kHz

 

+0 dB, -3 dB

+0 dB, -3 dB

+0 dB, -3 dB

SIGNAL TO NOISE RATIO

114 dB

 

118 dB

 

121 dB

 

“A” WEIGHTED

 

 

 

 

 

 

GAIN

26.4 dB

 

26.4 dB

 

26.4 dB

 

TOTAL HARMONIC

1 kHz <0.03%

1 kHz <0.03%

1 kHz <0.03%

DISTORTION (THD)

20 kHz <0.16%

20 kHz <0.16%

20 kHz <0.16%

ALL BALANCED, UNWEIGHTED

 

 

 

 

 

 

INPUT IMPEDANCE

100 kOhms

100 kOhms

100 kOhms

INPUT SENSITIVITY

2.53 Vrms

 

2.87 Vrms

 

3.71 Vrms

 

OUTPUT POWER

8 Ohms

350 W

8 Ohms

450 W

8 Ohms

750 W

EACH CHANNEL DRIVEN

4 Ohms

700 W

4 Ohms

900 W

4 Ohms 1,500 W

 

2 Ohms 1,400 W

2 Ohms 1,800 W

2 Ohms 3,000 W

OUTPUT VOLTAGE

Peak to Peak138 V

Peak to Peak 170 V

Peak to Peak 240 V

 

RMS

49 V

RMS

60 V

RMS

84 V

POWER CONSUMPTION

Stand-by

30 W

Stand-by

37.5 W

Stand-by

42.5 W

 

Idle

150 W

Idle

175 W

Idle

220 W

 

Max.

1,700 W

Max.

3,000 W

Max.

6,000 W

INPUTS

1 balanced via

1 balanced via

1 balanced via

 

XLR connectors

XLR connectors

XLR connectors

 

1 Krell CAST via 4-pin

1 Krell CAST via 4-pin

1 Krell CAST via 4 pin

 

bayonet connectors

bayonet connectors

bayonet connectors

OUTPUTS

2 pair (one upper,

2 pair (one upper,

2 pair (one upper,

SPEAKER BINDING POSTS

one lower)

 

one lower)

 

one lower)

 

REMOTE CONTROL

Optional

 

Optional

 

Optional

 

DIMENSIONS

 

 

 

 

 

 

INCHES

12.5w x 10.5h x 16.0d

12.5w x 10.5h x 19.0d

12.5w x 10.5h x 25.0d

CENTIMETERS

31.8w x 26.7h x 40.6d

31.8w x 26.7h x 48.3d

31.8w x 26.7h x 67.3d

WEIGHT

 

 

 

 

 

 

SHIPPING

79.0 lb., 35.9 kg

110.0 lb., 50.0 kg

155.0 lb., 70.5 kg

UNIT ONLY

68.0 lb., 31.0 kg

98.0 lb., 44.5 kg

140.0 lb., 63.6 kg

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 IntroductionDefinition of Terms OperationTechnology 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 Stereo Power Amplifiers Monaural 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 PostsConnecting the Full Power Balanced Amplifier to Your System Input and Output ConnectionsKrell Link Connections Connecting Using a Tube PreamplifierDC Protection Circuitry Krell Link Operation Amplifier OperationHOW to Switch Between Krell Cast and XLR Inputs Remote Control OperationHOW to Turn OFF HOW to Turn onAmplifier Troubleshooting HOW to Troubleshoot System NoiseHOW 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.