Refined reproduction and overwhelming power define the Evolution 2250e. Boasting technology sourced from award winning larger siblings, the Evolution 2250e provides the immense power and unmatched sound quality that are the hallmarks of all Krell amplifiers. Sharing the same advanced high speed output devices, massive power supplies, and unique Krell Current Mode circuitry; the Evolution 2250e delivers performance that was previously reserved for products costing far more.

Sophisticated and expensive to execute, surface mount circuitry is featured throughout gracing the design with short circuit path lengths, vanishing parasitic capacitance and improved bandwidth. Alone, the Evolution 2250e is ideal for use in stereo music systems. When coupled to the three channel Evolution 3250e, this duo makes ideal amplification for home theater applications.


Blessed with a power supply outfitted with a 2,500 VA power transformer and 136,000 µF of capacitance, the Evolution 2250e 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 reduces heat output substantially. 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 2250e is the smallest amplifiers in the Evolution e Series. Featuring a 4U (7" High) profile, the new amplifiers bring prodigious power to applications requiring smaller amplifiers without sacrificing sonic performance. The stylish Aluminum faceplate features the blue power ring when in operating mode and green in low draw standby mode that is 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:40 W
Idle: 90 W
Maximum: 2400 W

Analog Audio Inputs
2 single-ended via RCA connector
2 balanced via XLR connector
Input Impedence
50 kOhm single-ended
100 kOhm balanced
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
Shipped: 92 lbs., 41.6 kg
Unit only: 77 lbs., 34.8 kg

"This Krell amp was one of the most formally 'correct' power amps I've yet met as though it had emerged straight from a page of the textbook on amplifier design" .. more

  • EVOLUTION 2250e Stereo Amplifier
  • EVOLUTION 2250e Stereo Amplifier
  • EVOLUTION 2250e Stereo Amplifier

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