Reviews

Evolution 403e

Hi Fi Critic Review

"The overall quality is so well balanced and so even over the frequency range, it's easy to underestimate how good this amplifier is, and one only finds out what might be missing when substituting other references."

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Evolution 3250e

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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S-1500

Techrader.com

"Krell's audio prowess is something to behold. The S-1200U/S-1500 combination sounds huge, immersive, richly detailed, full-bodied and smoother than a panther wearing a smoking jacket."

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Specifications

Evolution 403e

Frequency Response

20 Hz to 20 kHz +0, -0.17 dB

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

 

Signal to Noise Ratio

>106 dB, unweighted, referred to full power output

>116 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

800 W RMS at 4 Ohms

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

>125, 20 Hz to 20 kHz

 

Transformers

Two 3300 VA (6000VA total) for audio circuitry

One 10 VA for digital control circuitry

 

Power Supply Capacitance

108,000 µF

 

Power Consumption

Standby: 2 W

(High-current standby: 370W)

Idle: 570 W

Maximum: 5000 W

Heat Output

Stand-by: 7 BTU/hr.

(High-current standby: 1270 BTU/hr.)

Idle: 1950 BTU/hr.

Maximum: 7700 BTU/hr.

 

Inputs

3 single-ended via RCA connector

3 balanced via XLR connector

3 CAST via 4-pin bayonet connector

 

Outputs

3 pairs Krell binding posts

 

Dimensions

17.3 in. W x 9.8 in. H x 26.1 in. D

438 mm W x 248 mm H x 662 mm D

 

Weight

Shipped: 190 lb., 86 kg

Unit Only: 175 lb., 79.2 kg

Evolution 3250e

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: 50 W

Idle: 125 W

Maximum: 2400 W

 

Analog Audio Inputs

3 single-ended via RCA connector

3 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

3 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: 170 BTU/hr

Idle: 430 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: 95 lbs., 43.0 kg

Unit only: 80 lbs., 36.2 kg

S-1500

Frequency Response

20 Hz to 20 kHz +0, -0.2 dB

<0.2 Hz to 95 kHz+0 dB, -3 dB

 

Signal to Noise Ratio

>115 dB, "A"-weighted

 

Gain

26.2 dB

 

Total Harmonic Distortion

< 0.03%@1kHz, at 150 W, 8 Ohms

< 0.20%@20 kHz, at 150 W, 8 Ohms

 

Input Impedance

Single Ended: 45 kOhms

Balanced: 90 kOhms

 

Input Sensitivity

Single Ended or Balanced: 1.70 V RMS

 

Output Power

150 W RMS at 8 Ohms

300 W RMS at 4 Ohms

Output Voltage

98 V peak-to-peak

35 V RMS

 

Output Current

15 A peak

 

Slew Rate

60 V/µs

 

Output Impedance

<0.070 Ohms at 20 Hz

<0.080 Ohms, 20Hz to 20 kHz<

 

Damping Factor (referred to 8 ohms)

115 at 20 Hz,

100, 20Hz to 20 kHz,

 

Power Consumption

Standby: 70 W

Idle: 130 W

Maximum: 1300 W

Heat Output

Stand-by: 240 BTU/hr.

Idle: 450 BTU/hr.

Maximum: 1900 BTU/hr.

 

Inputs

5 single-ended via RCA connector

5 balanced via XLR connector

 

Outputs

5 channels via 5-way binding posts

 

Dimensions

17.3w x 5.7h x 19.8d

43.9w x 14.5h x 50.3d

 

Weight

Shipped: 66 lb., 29.9 kg

Unit Only: 56 lb., 25.3 kg

Press Releases

Hi Fi Critic Review

"The overall quality is so well balanced and so even over the frequency range, it's easy to underestimate how good this amplifier is, and one only finds out what might be missing when substituting other references."