Ensuring Maximum Performance

“My pursuit of excellence in sound reproduction and my love of great musical performance has led me to the Evolution One Amplifier, and fuels the ongoing Evolution design effort at Krell.”

Dan D’Agostino

The Krell Evolution One Monaural Power Amplifier, built upon the foundation of huge, regulated power supplies and output stages, is designed to drive any loudspeaker with complete control. The product of breakthrough Krell technolo- gy, this amplifier provides a sound that is supremely dynamic and musical. Indeed, it is the sound of the music itself.

Core Technologies

Class A, Balanced, Current Mode Gain

Topologies from Input to Output

Audio signal voltages are converted to currents at the amplifier input, and the audio signal remains in the current domain throughout the entire amplifier until the output stages. All signal gain is realized in the current domain using propri- etary multiple-output current mirrors with extraordinary open loop linearity. The current mirrors in the final gain stages use 36 pairs of high voltage, high speed transistors. Originally developed for demanding, high bandwidth video circuits, these transistors help yield gain stages with superb accuracy and very low dis- tortion. The signal path is fully complementary and fully balanced from input to output. The driver and output stages use 28 pairs of 150 Volt, 14 Amp, 50 megahertz power transistors mounted on Krell-designed high efficiency heat sinks.

All transistors operate in Class A mode. Independent complementary pre- driver and driver stages for the positive and negative output transistors make the output stages extremely fast and linear. The output stage develops 450 Watts into an 8 Ohm load, 900 Watts into 4 Ohms, and 1800 Watts into 2 Ohms. This unique circuit is impervious to low-impedance or reactive loads; the Evolution One amplifier simply drives any loudspeaker with absolute confi- dence, achieving the very best possible sonic results.

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Krell Industries Evolution One manual Ensuring Maximum Performance, Core Technologies
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Evolution One specifications

Krell Industries is synonymous with high-fidelity audio and innovative engineering, showcasing their prowess in speaker design with the Evolution One. This speaker embodies the cutting-edge technology and striking aesthetics that Krell is recognized for in the audiophile community.

The Evolution One features a unique dual-woofer configuration, delivering powerful bass response without distortion. Each woofer is meticulously crafted from advanced composite materials, ensuring that the sound remains accurate and dynamic, even at high volumes. This design aligns perfectly with Krell's dedication to reproducing music with the utmost authenticity.

At the heart of the Evolution One is Krell's proprietary CAST (Current Mode Amplification) technology. This innovation sets Krell apart from competitors by allowing the signal to flow through a path that maintains the purity of the audio signal. By operating in current mode rather than voltage mode, CAST drastically reduces the impact of circuit interference that often plagues traditional audio systems. The result is a level of transparency and low distortion that appeals to even the most discerning audiophiles.

The speaker also incorporates advanced crossover technology, which seamlessly integrates the woofers and tweeter. Krell employs a fourth-order Linkwitz-Riley crossover to ensure that the different drivers work in perfect harmony. This feature aids in achieving a balanced and cohesive soundstage, enhancing the listening experience across various musical genres.

Visually, the Evolution One is a statement piece. Its sleek, modern design is complemented by a high-gloss finish, ensuring it not only sounds exceptional but also serves as an elegant addition to any audio setup. The robust cabinet construction eliminates unwanted vibrations, further enhancing sound clarity.

Moreover, the Evolution One is equipped with advanced bi-wiring and bi-amping options, allowing audiophiles to optimize their setups based on personal preferences and system requirements. This flexibility makes the Evolution One an adaptable choice for those looking to refine their audio systems further.

In summary, the Krell Industries Evolution One is a culmination of innovative technology, premium materials, and exquisite design. With features such as dual-woofer configurations, CAST technology, and advanced crossover design, it stands as a testament to Krell's commitment to delivering high-fidelity audio experiences that resonate with both casual listeners and dedicated audiophiles alike.
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