Reviews

Evolution 302e

Ultra High-End

"The Krell Evolution 302e is, quite simply, a killer amplifier."

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Evolution 2250e

Home Theater Review

"The 3250e is a phenomenal amplifier, one that possesses tremendous bass prowess that is fast on the attack with great poise that is equally suited for both music and movies. The 3250e has an open and natural sounding midrange coupled with a delicate and airy high frequency performance that is far and away the best in its class. All of the 3250e's attributes add up to yet another very special amplifier from Krell"

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Downloads

Evolution

     - Brochure

     - e Series Owners Reference

     - e Series Quick Start Guide

 

Specifications

Evolution 402e

Frequency Response

20 Hz to 20 kHz +0, -0.17 dB

<0.5 Hz to 125 kHz +0, -3 dB

 

Signal to Noise Ratio

>108 dB, wide band,unweighted, referred to full power output

>118 dB, "A"-weighted

 

Gain

25.4 dB

 

Total Harmonic Distortion

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

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

 

Input Impedance

Single Ended: 100 kOhms

Balanced: 200 kOhms

CAST: 70 Ohms

 

Input Sensitivity

Single Ended or Balanced: 3.04 V rms

CAST: 3.04 mA rms

 

Output Power

400 W RMS at 8 Ohms both channels driven

800 W RMS at 4 Ohms both channels driven

Output Voltage

160 V peak-to-peak

57 V RMS

 

Output Current

37 A peak

 

Slew Rate

100 V/µs

 

Output Impedance

<0.055 Ohms at 20 Hz

<0.064 Ohms, 20 Hz to 20 kHz

 

Damping Factor (referred to 8 ohms)

>145 at 20 Hz, referred to 8 Ohms

>125, 20 Hz to 20 kHz, referred to 8 Ohms

 

Transformers

Two 2200 VA (4400VA total) for audio circuitry

One 10 VA for digital control circuitry

 

Power Supply Capacitance

188,000 µF

 

Power Consumption

Standby: 2 W

(High-current standby: 260W

Idle: 390 W

Maximum: 3800 W

Heat Output

Stand-by: 7 BTU/hr.

(High-current standby: 890 BTU/hr.)

Idle: 1300 BTU/hr.

Maximum: 6400 BTU/hr.

 

Inputs

2 single-ended via RCA connector

2 balanced via XLR connector

2 CAST via 4-pin bayonet connector

 

Outputs

2 pairs Krell binding posts

 

Dimensions

17.25 in. W x 9.75 in. H x 22.05 in. D

438 mm W x 248 mm H x 560 mm D

 

Weight

Shipped: 150 lb., 67.9 kg

Unit Only: 135 lb., 61.1 kg

Evolution 302e

Frequency Response

20 Hz to 20 kHz +0, -0.10 dB

<0.5 Hz to 180 kHz +0, -3 dB

 

Signal to Noise Ratio

>107 dB, wide band, unweighted, referred to full power output

>117 dB, "A"-weighted

 

Gain

25.5 dB

 

Total harmonic Distortion

<0.02% at 1 kHz, at 300 W, 8 Ω

<0.15% at 20 kHz, at 300 W, 8 Ω

 

Input impedance

Single-ended: 100 kΩ

Balanced: 200 kΩ

CAST: 75 Ω

 

Input Sensitivity

Single-ended or balanced: 2.60 V RMS

CAST: 2.60 mA RMS

 

Output Power

300 W RMS at 8 Ω

600 W RMS at 4 Ω

1200 W RMS at 2 Ω

Output Voltage

139 V peak-to-peak

49 V RMS

 

Output Current

35 A peak

 

Slew Rate

120 V/µs

 

Output Impedance

<0.040 Ohms at 20 Hz

<0.053 Ohms, 20 Hz to 20 kHz

 

Damping Factor (referred to 8 ohms)

>200 at 20 Hz, referred to 8 Ω

>150, 20 Hz to 20 kHz, referred to 8 Ω

 

Power Consumption

Stand-by: 2 W

High Current Stand-by: 150 W

Idle: 320 W

Maximum: 3400 W

Heat Output

Stand-by: 7 BTU/hr.

High Current Stand-by: 510 BTU/hr.

Idle: 1100 BTU/hr.

Maximum: 5500 BTU/hr.

 

Inputs

2 single-ended via RCA connector

2 balanced via XLR connector

2 CAST via 4-pin bayonet connector

 

Outputs

2 pairs Krell binding posts

 

Dimensions

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

438 mm W x 248 mm H x 525 mm D

 

Weight

Shipped: 138 lb., 62.4 kg

Unit Only: 120 lb., 54.3 kg

Evolution 2250e

Frequency Response

20 Hz to 20 kHz +0.0, -0.07 dB at 8 Ohms

0.3 Hz to 150 kHz +0.0, -3 dB at 8 Ohms

 

Signal to Noise Ratio

"A" weighted 116 dB

 

THD

< 0.020% at 1 kHz, at 250 W, 8 Ohm Load

< 0.15% at 20 kHz, at 250 W, 8 Ohm Load

 

Output Voltage

47 Vrms or 133 V peak to peak

 

Output Power

250 Wrms per channel at 8 Ohms

500 Wrms per channel at 4 Ohms

 

Output Current

20 A peak

 

Output Impedance

< 0.060 Ohms at 20 Hz

< 0.067 Ohms, 20 Hz to 20 kHz

Slew Rate

80 V/µs

 

Damping Factor

< 130 at 20 Hz, referred to 8 Ohms

< 120, 20 Hz to 20 kHz, referred to 8 Ohms

 

Power Consumption

Standby: 2 W

High Current standby:40 W

Idle: 90 W

Maximum: 2400 W

 

Analog Audio Inputs

2 single-ended via RCA connector

2 balanced via XLR connector

 

Input Impedance

50 kOhm single-ended

100 kOhm balanced

 

Gain

25.7 dB

 

Input Sensitivity

2.32 Vrms

Analog Audio Outputs

2 pr. via WBT Binding Posts

 

Control Input

1 12 VDC trigger input via 3.5 mm connector

 

Control Output

1 12 VDC trigger output via 3.5 mm connectors

 

Heat Output

Standby: 7 BTU/hr

High Current Standby: 140 BTU/hr

Idle: 310 BTU/hr

Maximum: 3100 BTU/hr

 

Dimensions

17.25 in. W x 7.6 in. H x 19.13 in. D

438 mm W x 193 mm H x 486 mm D

 

Weight

Shipped: 92 lbs., 41.6 kg

Unit only: 77 lbs., 34.8 kg