Krell Industries Evolution manual Specifications, Frequency Response

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Specifications

Measurement

Evolution 302 Amplifier

Evolution 402 Amplifier

FREQUENCY RESPONSE

20 Hz to 20 kHz +0, –0.10 dB

20 Hz to 20 kHz +0, –0.18 dB

 

<0.5 Hz to 180 kHz +0, –3 dB

<0.5 Hz to 120 kHz +0, –3 dB

SIGNAL-TO-NOISE RATIO

 

 

Wideband, unweighted, referred to full

>107 dB

>106 dB

power output

 

 

“A” weighted

>117 dB

>116 dB

GAIN

25.5 dB

25.4 dB

TOTAL HARMONIC DISTORTION

<0.02% at 1 kHz, at 300 W, 8 Ohms

<0.02% at 1 kHz, at 400 W, 8 Ohms

 

<0.15% at 20 kHz, at 300 W, 8 Ohms

<0.15% at 20 kHz, at 400 W, 8 Ohms

 

 

 

INPUT IMPEDANCE

 

 

Single-ended

100 kOhms

100 kOhms

Balanced

200 kOhms

200 kOhms

CAST

75 Ohms

70 Ohms

INPUT SENSITIVITY

 

 

Single-ended or balanced

2.60 V rms

3.04 V rms

CAST

2.60 mA rms

3.04 mA rms

 

 

 

OUTPUT POWER

300 W rms at 8 Ohms

400 W rms at 8 Ohms

All channels driven

600 W rms at 4 Ohms

800 W rms at 4 Ohms

 

1200 W rms at 2 Ohms

1600 W rms at 2 Ohms

OUTPUT VOLTAGE

139 V peak-to-peak

160 V peak-to-peak

 

49 V rms

57 V rms

OUTPUT CURRENT

35 A peak

37 A peak

SLEW RATE

120 V/s

100 V/s

OUTPUT IMPEDANCE

<0.040 Ohms at 20 Hz

<0.055 Ohms at 20 Hz

 

<0.053 Ohms, 20 Hz to 20 kHz

<0.064 Ohms, 20 Hz to 20 kHz

DAMPING FACTOR

>200 at 20 Hz

>145 at 20 Hz

Referred to 8 Ohms

>150, 20 Hz to 20 kHz

>125, 20 Hz to 20 kHz

 

 

 

POWER CONSUMPTION

 

 

Stand-by

150 W

370 W

Idle

320 W

570 W

Maximum

3400 W

3800 W

HEAT OUTPUT

 

 

Stand-by

510 BTU/hr.

890 BTU/hr.

Idle

1100 BTU/hr.

1300 BTU/hr.

Maximum

5500 BTU/hr.

6400 BTU/hr.

 

 

 

INPUTS

2 single-ended via RCA connector

2 single-ended via RCA connector

 

2 balanced via XLR connector

2 balanced via XLR connector

 

2 CAST via 4-pin bayonet connector

2 CAST via 4-pin bayonet connector

OUTPUTS

2 pairs Krell binding posts

2 pairs Krell binding posts

 

 

 

DIMENSIONS

17.3 in. W x 9.8 in. H x 20.7 in. D

17.3 in. W x 9.8 in. H x 22.1 in. D

 

438 mm W x 248 mm H x 525 mm D

438 mm W x 248 mm H x 550 mm D

WEIGHT

 

 

Shipping

138 lb., 62.4 kg

150 lb., 67.9 kg

Unit only

120 lb., 54.3 kg

135 lb., 61.1 kg

 

 

 

All operational features, functions, specifications, and policies are subject to change without notification.

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Contents Evolution Important Safety Instructions Contents List of Illustrations Letter from Dan D’Agostino Evolution Amplifier Features and Technology FeaturesRevolutionary Krell Cast Technology Voltage Signal Transmission Traditional Audio SystemHow Cast and Krell Current Mode Interact Cast BasicsCast Cable Construction Evolution CastBest Musical Performance Definition of Terms Inputs and OutputsOperation Krell Current Mode TechnologyActive Cascode Topology Unpacking and Placement Opening the Evolution Amplifier Shipping CartonPlacement AC Power GuidelinesAnatomy of an Evolution Amplifier Evolution Amplifier Front Panel Evolution 402 shownPower Status Indicator PowerPower Button Front Panel DescriptionEvolution 302 Stereo Amplifier Back Panel Evolution 402 Stereo Amplifier Back Panel Evolution 403 Multi-channel Amplifier Back Panel Evolution Monaural Amplifier Back Panel Evolution 600 shown Back Panel Description OutputsInputs Remote Connections IEC Power Cord ReceptaclePower Breaker Switch VDC In/Out 12 V TriggerCast Connections Connecting an Evolution Amplifier to Your SystemXLR Pin Configuration Balanced ConnectionsEvolution DC Protection Circuitry/Using Tube Preamplifiers Connection StepsSection Five Troubleshooting System Noise How to Evaluate Amplifier OperationError Codes Diagnostic Code Possible Condition Course of ActionQuestions and Answers Warranty Page To contact the Krell Service Department Return Authorization ProcedureHow to Expedite Service How to Return a ProductSpecifications Frequency ResponseMeasurement Evolution 403 Amplifier Measurement Evolution 600 Amplifier Evolution 900 Amplifier WNER’S Reference Krell INDUSTRIES, INC

Evolution specifications

Krell Industries has established itself as a pioneer in high-performance audio equipment, renowned for delivering unparalleled sound quality and innovative technologies. Founded in 1980, the company quickly became synonymous with premium amplification, earning accolades from audiophiles worldwide. Over the years, Krell has evolved its product lineup to include not only amplifiers but also preamplifiers, digital audio players, and complete home theater systems.

One of the hallmark features of Krell products is their robust build quality. The company employs a strong engineering ethos that prioritizes durability and reliability in all its offerings. The iconic, heavy chassis of Krell components serves not only as a protective shell but also minimizes vibrations, which can adversely affect sound quality. This engineering strategy is evident in their signature line of amplifiers, which utilize high-grade materials and precision craftsmanship to ensure longevity and optimum performance.

Krell has also been at the forefront of technological advancements. The introduction of class A amplification circuitry is one such innovation that has been integral to the company's sound signature, allowing for minimal distortion and a rich, dynamic range. This technology ensures that even the most subtle nuances in music are reproduced with fidelity and clarity.

Moreover, Krell has embraced digital audio, creating DACs (digital-to-analog converters) and streaming devices that support high-resolution audio formats. This commitment to digital excellence reflects the company's understanding of evolving consumer preferences. Many of their devices feature wireless connectivity options, allowing users to stream music seamlessly from various sources without sacrificing audio quality.

In addition, Krell emphasizes user-friendly interfaces and versatility in its designs. Customers can often find features such as programmable presets, remote control functionality, and intuitive navigation systems, making it easier to tailor their listening experience.

Krell Industries’ evolution over the years showcases a dedication to audio fidelity, technological advancement, and stylish design. As the company continues to innovate within the high-end audio landscape, it maintains its reputation as a brand that audiophiles can trust, delivering exceptional sound experiences that stand the test of time.