KrellEvolution 403usedKrell Evolution 403, recapped by Krell, $22K retail and $4,000 below Blue BookKrell Evolution 403 three channel power amplifier. Likely one of the best three channel amplifiers ever made. -Originally $22,000 -Fully serviced/recapped by Krell for $2,650 in late 2017/early 20...5850.00

Krell Evolution 403, recapped by Krell, $22K retail and $4,000 below Blue Book

Listing ID: lisa5253 Classified 
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Condition
8/10
Payment methods
Ships fromSanta Barbara, CA, 93101
Ships toUnited States
Package dimensions36.0" × 24.0" × 20.0" (200.0 lbs.)
Shipping carrierunspecified
Shipping cost$350.00
Original accessoriesBox, Manual
AverageResearch Pricing

Krell Evolution 403 three channel power amplifier. Likely one of the best three channel amplifiers ever made.

-Originally $22,000 
-Fully serviced/recapped by Krell for $2,650 in late 2017/early 2018
-Audiogon Blue Book average $10,573 (including units that weren't recapped)
-Service records available  
-Includes original inner and outer cartons 
-Overall excellent condition with one noticeable scratch on top panel 
-Will ship freight (195 lbs). If freight is more than $350, I will pay the difference.  
-If freight is less than $350, I will refund the difference. 
-PayPal please add 3%, or send via friends and family for free. 

You may read my feedback to be assured of a smooth deal.

Highlights from Home Theater Review:

The Evolution line utilizes active Cascode Topography, which eliminates global negative feedback, only allowing nested local feedback around the individual gain cells, making for a more open and liquid sound, while the massive power of these amplifiers ensures effortless audio reproduction almost regardless of your speakers' efficiency. Krell's Current Mode and CAST circuitry are employed, as well as circuit topography, which makes a huge step forward in bandwidth capability, allowing near perfect performance in the audio spectrum.

Amplifiers require good power to make good power, and the Evolution 403 uses the same power supply found in Krell's own Evolution 900 900-watts-per-channel mono-block amplifiers, supplying 6,000-volt amps of power, while both electrical and magnetic shielding keep the power supply from interfering with any of the audio circuits. The power supply itself filters RF noise, as well as correcting asymmetric power waveforms and DC current on the main AC line. All this makes for not only a large but a heavy amplifier. The Krell Evolution 403 is 17.3 inches wide, 9.8 inches tall and 26.1 inches deep, weighing 175 pounds. Krell quotes heat output as 1,270 BTU per hour in standby and a max of 7,700 BTU per hour in heavy usage; power consumption can be up to 5,000 watts. 

The specs on this amp are amazing. Frequency response is 20 Hz to 20 kHz with +0 to -0.18 dB variance, with the ability to extend from 0.5 Hz to 120 kHz, with only +0 to -3 dB variance. Signal to noise is ratio is >116 dB "A" weighted at full power output, while distortion is rated at 0.15% at 20 kHz and full 400-watt output into an eight-ohm load. The output power doubles down to 800 watts per channel into four-ohm loads and 1,600 watts per channel into two-ohm loads. 

When you read the specs, you know why this amplifier is so big. This is no minor piece of engineering, and the piece reflects that in every regard. The fit and finish of this amp is amazing. Mine came in a beautiful silver aluminum finish. The entire unit is machined from aluminum, and has a wonderful silvery gleam to it. The front has a thick, machined faceplate. There is a matching middle section of the Evolution 707 AV preamp and a large single button in the middle for activating the amplifier from standby mode, with the only light being a the ring around the large central power button, red for standby, blue for on.



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