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."
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"
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."