Krell Evolution EV-402 Amplifier - 400W Flagship

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An incredibly powerful amplifier from Krell.  So much so that it uses a 20 Amp power cord AND industrial type breaker for a power switch to match its internal 5000 VA power supply.

Fully tested in our lab were it maxed out our amplifier load instrument (which maxes out at 250W).  And did so without a glitch or strain of any kind or type.

Contains balanced, single ended, and proprietary Krell CAST type connectors for input, and includes our favorite wing nut type speaker posts for the outputs. 

Provides an incredible 400W into 8 Ohms and 1600W into 2 Ohms.

In good cosmetic condition just exhibiting a few light scuffs on the aluminum as shown in our photos.

Please note a 20 amp power cord is not included but we can look to add one to your order if you need. Just let us know in your checkout order notes, thank you.

Click here for a PDF copy of the Krell Evolution EV-402 Amplifier Owner's Reference 

Our Testing Process for Amplifiers (Solid State) at SkyFi:

We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage Kef speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.