The S-550i is powered by a 1,750-watt transformer and 68,000F of capacitance into a 5″ high chassis. This power supply feeds classic Krell circuitry throughout the topology using only discrete circuitry. The S-550i doubles its power output when a speaker’s impedance is halved. For the S-550i, the results are 275 watts into 8 ohms and 550 watts into 4 ohms with both channels driven.
The S-550i Integrated Amplifier retails for $5,000 and you can see all the specs here: http://www.krellonline.com