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 Evolution 403e


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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      





The Evolution 403e is the most powerful three channel amplifier available today. Housed in the same chassis as the Evolution 900e, the Evolution 403e is the perfect choice for Left, Center, and Right channel amplification in a high performance home theater. For reference caliber performance, coupling the Evolution 403e to Evolution 900e, Evolution 600e, or an Evolution 402e elevates an already potent system to new heights. At a staggering 1,400 watts into 2 Ohm loads, the Evolution 403e is a virtually limitless source of power for any speaker.

Power is critical for the explosive dynamics that is essential to the home theater experience. This power capability is coupled to a new green operating mode that reduces standby electrical draw to a mere 2 Watts. However, power alone is not the goal as film soundtracks are the emotional vehicles in movies. It is music, not on-screen action, that communicates loss, fear, victory, and determination in movies - think of Rocky, Darth Vader, and Jaws without their theme music. Conveying emotion through music is the true strength of the Evolution 403e and an essential element for stereo and home theater listening.


Power Supply The Evolution 403e is equipped with two 3,000 VA transformers and 188,000 µF. This power source is the backbone for the output of the Evolution 403e. With this foundation, the Evolution 403e delivers 400 watts into 8 Ohms and 800 watts into 4 Ohms with three channels driven simultaneously.

The FTC mandates that power ratings are quoted using a 1,000 Hz sine wave into a fixed 8 Ohm resistor with final power specification stated at 1% distortion. Krell engineering considers this specification too lenient and not indicative of what an amplifier is required to provide. Krell designs to a much stricter standard. Our power tests use a 20-20,000Hz signal into 8, 4, and 2 Ohm loads. Our power tests use a 20-20,000Hz signal into 8, 4, and 2 Ohm loads with our final specifications stated for .1% distortion.