Evolution DC Protection Circuitry/Using Tube Preamplifiers

The high DC output of tube preamplifiers may exceed the active DC protection circuitry of the Evolution amplifiers. Excessive DC level in a signal can damage amplifiers, loudspeakers, or both. The single-ended inputs of the Evolution ampli- fiers are capacitor-coupled and DC does not pass through. Therefore, if connect- ing a tube preamplifier, use the single-ended inputs only. For more information about DC protection circuitry features, see Error Codes on page 26.

Connection Steps

Position the amplifier where you intend to use it in your system.

The following steps describe how to connect an Evolution amplifier to your sys- tem:

1.Turn off all power sources and components before connecting inputs and out- puts.

2.Neatly arrange and organize wiring to and from the Evolution amplifier and all components. Separate AC wires from audio cables to prevent hum or other unwanted noise from being introduced into the system.

3.Connect the outputs of your preamplifier to the appropriate CAST (4), balanced (6), or single-ended inputs (5) on the Evolution amplifier.

Note

Connect the u-shaped jumpers between pins 1 and 3 of the XLR connectors when using single-ended inputs.

4.Connect the loudspeaker cables to the loudspeaker binding posts (7) on the Evolution amplifier. The binding posts accept spade lugs only. Take care to observe the correct polarity when making connections: The positive (+) output connects to the positive input of the loudspeaker. The negative (-) output con- nects to the negative input of the loudspeaker.

5.Connect the supplied AC power cord to the AC power cord receptacle (9).

6.Plug the AC power cord into AC power.

Note

Use only the power cord provided with the Evolution amplifier to make the connection to AC power. Operation with a power cord other than the one supplied by Krell could induce noise, limit current, or otherwise impair the ability of the amplifier to perform optimally.

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Krell Industries 400, Evolution 600, 900 manual Evolution DC Protection Circuitry/Using Tube Preamplifiers, Connection Steps
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400, 900, Evolution 600 specifications

Krell Industries is a renowned namesake in the high-end audio and home theater equipment market, revered for its cutting-edge engineering and exceptional performance. Among its standout offerings are the Krell 900, Evolution 600, and Evolution 400, each designed for audiophiles seeking to elevate their listening experience.

The Krell 900 is a powerhouse amplifier that marries high-output power with a sophisticated design. Featuring Class A/B amplification, it operates with minimal distortion, ensuring that sound quality remains pure even at high volume levels. The unit boasts a massive power supply that allows it to handle a wide variety of speaker impedances effortlessly. With its robust build and a sleek, minimalist aesthetic, the Krell 900 is not only a technical marvel but also a visual centerpiece in any audio setup.

On the other hand, the Evolution 600 represents Krell’s commitment to harnessing the latest technology to achieve superior sound. This amplifier utilizes Krell’s proprietary current mode topology, which optimizes power delivery and offers instantaneous response to dynamic audio signals. The Evolution 600 is equipped with advanced thermal management systems that keep the unit cool during extended use, ensuring reliability and longevity. Furthermore, the elegant design complements any home decor, making it a stylish and functional addition to high-end audio environments.

The Evolution 400, while slightly smaller, exemplifies Krell’s hallmark of uncompromising sound quality. It integrates many of the same high-end technologies found in its larger counterparts but in a more compact form. With a focus on delivering dynamic range and clarity, the Evolution 400 is ideal for both music and home theater applications. Advanced digital signal processing, combined with analog audio circuitry, ensures that every note and detail is captured with impeccable accuracy.

All three models prioritize connectivity and user experience, featuring a range of inputs, including balanced XLR and unbalanced RCA options, allowing seamless integration into various audio systems. Each amplifier emphasizes robust build quality, featuring heavy-duty chassis and meticulously designed circuit layouts to minimize interference and signal degradation.

In conclusion, Krell Industries’ 900, Evolution 600, and Evolution 400 amplifiers exemplify the pinnacle of audio craftsmanship. They combine innovative technologies, premium components, and stunning aesthetics, making them the perfect choice for discerning audio enthusiasts who demand nothing but the best in sound reproduction.
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