Reviews
Evolution 302e
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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Evolution
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
