Home Theater Review 2011 Best Of Awards

Precision and power characterize the Evolution 3250e amplifier. Identical in sound quality and power output as the Evolution 2250e, the foundation of the Evolution 3250e is circuitry and engineering found in the larger Evolution e Series amplifiers. Utilizing the same advanced high speed output devices, massive power supplies, and unique Krell Current Mode circuitry, the Evolution 3250e amplifier elevates movie listening to an audiophile experience.

The latest manufacturing technologies are used throughout the design including surface mount circuit pathways. Surface mount circuitry increases the usable real estate on a circuit board and allows for a more sophisticated circuit in the same area. Surface mount circuitry shortens circuit path lengths, eliminates parasitic capacitance and improves bandwidth.


Blessed with a power supply outfitted with a 2,500 VA power transformer and 163,200 µF of capacitance, the Evolution 3250e is a powerhouse. Power output of 250 W per channel into 8 ohms and 500 W per channel into 4 ohms will drive any loudspeaker to its full dynamic capability. An additional transformer for control and protection circuitry also provides power for a new energy efficient standby mode. Similar to turning off a 150W light that is always on in your house; standby power draw is only 2W. This 99% reduction in electrical usage also substantially reduces heat output. The high-current and high-voltage analog supplies have additional noise filtration circuitry to reduce high-frequency switching noise.


Housed in elegant silver or black brushed anodized Aluminum, the Evolution 3250e is the smallest amplifier in the Evolution e Series. Featuring a 4U (7" High) profile, the Evolution 3250e includes mounts for rack installations bringing elegance not typically found in rack mountable amplifiers. The stylish Aluminum faceplate features the blue power ring and low draw standby mode shared by all Evolution e Series amplifiers.

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
< 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 Impedence
< 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 Impedence
50 kOhm single-ended
100 kOhm balanced
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
Shipped: 95 lbs., 43.0 kg
Unit only: 80 lbs., 36.2 kg


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...

  • Evolution 3250e Three Channel Amplifier
  • Evolution 3250e Three Channel Amplifier
  • EVOLUTION 3250e Stereo Amplifier
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