September 16, 2009
KRELL INDUSTRIES INTRODUCES S-275 And S-150m Power Amplifiers

A space saving design delivers full audiophile performance from a surprisingly compact cabinet.

By Gary Reber

Krell Industries, Inc. has announced the introduction of two new S Series amplifiers, the S-275 and S-150M. Designed with modern day space constraints in mind; the S-275 and S-150M deliver legendary Krell amplifier performance in new slim line designs. The S-275 and S-150 are small enough to permit installation of multiple amplifiers in the space a conventional amplifier would normally occupy.

“With technology sourced from our flagship Evolution amplifiers but in a footprint and price that is significantly smaller, the S-275 and S-150m amplifiers deliver Krell performance in installations where a lesser product would normally have been selected.” said Bill McKiegan, Vice President, USA Sales and Marketing. “It’s an affordable way to bring Krell’s incomparable sound quality into any home.”

The S-275 and S-150M share design and manufacturing technology. Both the S-275 and S-150M feature Krell’s newest design enhancements, which assure huge output current capability and deliver further sonic refinement. The S-275 and S-150M feature high performance linear power supplies, 135,000 and 55,000 microfarads respectively.  Extensive power supply filtering and decoupling between stages assure low noise and high stability. The gain stages use Krell Differential Current Mode™, discrete Class A, and fully complementary circuitry. The circuitry also features very low negative feedback. For maximum conductivity and oxidation immunity, all circuit board traces are gold plated.

The S-275 is a flexible design boasting 275 watts/channel in stereo mode. A switch on the rear panel converts the S-275 to a 550 watt mono amplifier. The S-275 is a half wide design allowing two amplifiers to fit in the same space as a normal sized amplifier.

Even more streamline at only 3.4” wide, the S-150m monaural power amplifier boasts our latest circuit topology and a substantial power output of 150 Watts into 8 Ohms and 300 Watts into 4 Ohms. Technology developed in the Krell Evolution amplifiers can be found within the elegant exterior including Krell Differential Current Mode circuitry and balanced operation. Perfect for stereo, distributed audio, and home theater applications, the S-150m is the ideal choice for high performance systems in space limited loca­tions.

Both amplifiers include 12 volt trigger input/outputs, balanced connectors and superior WBT signal connectors and speaker binding posts. And its handsome brushed-aluminum faceplate is available in silver or black finish.

Suggested U.S. retail price for the S-275 is $5,500 and $2,500 for the S-150m.

For more information and specifications on the S-275,S-150m  and other Krell products, visit <> .

About Krell Industries

Krell Industries, founded in 1980, is the world’s premier manufacturer of high-end audio equipment. Its amplifiers, preamplifiers, SACD players, DVD players, surround-sound processors, digital-to-analog converters, and loudspeakers have won acclaim in countless magazine and website reviews, and among audiophiles worldwide. Perhaps no company in audio today enjoys a more distinguished reputation for engineering innovation and product excellence.

Tags: - CEDIA 2009 - - Krell Industries - - S Series Power Amplifiers - - S-275 - - S-150M - - Evolution - - Krell Differential Current Mode - - Class A - - 12-volt trigger -