Krell Industries KSA 150 / 250 owner manual Power Considerations, Unpacking

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protective action exists for a wide range of problematic conditions. Collectively, the protection circuitry is designed to avoid damage caused by other defective components, faulty wiring, mishandling of the system or amplifier failure.

Krell is committed to balanced operation in all products. Balanced systems have long been standard in professional audio applications and the same advantages apply to home audio equipment. There is a 6dB increase in gain without an increase in noise and there is a decrease in overall system noise caused by stray AC and RF fields. Sonic performance is drastically improved, particularly in dynamic and soundstage presentation.

B.POWER CONSIDERATIONS

The KSA-150 is rated as delivering 150 watts per channel into 8 ohms. The amount of Class A power is adjusted for the finest sonic performance with a minimum of generated heat and energy consumption. The amplifier’s maximum power into 8 ohms is 220 watts per channel. The KSA-250 is rated as delivering 250 watts per channel into 8 ohms. The amplifier’s maximum power into 8 ohms is 320 watts per channel.

That every Krell product uses Class A circuitry in all gain and supply stages is a foundation of our design philosophy. A second design commitment that relates to amplifiers is that every unit be capable of doubling its output into successively lower impedances. The KSA-150 will deliver 300 watts per channel into 4 ohms, 600 watts per channel into 2 ohms and 1,200 watts per channel into 1 ohm. The KSA-150 is fully capable of driving impedances below 1 ohm. The KSA-250 will deliver 500 watts per channel into 4 ohms, 1,000 watts per channel into 2 ohms and 2,000 watts per channel into 1 ohm. The KSA-250 is capable of driving impedances below 1 ohm.

Given the above, the AC power supplied to the amplifier is crucial to getting maximum performance. The KSA-150 will operate at its peak with a dedicated

20- amp line, although this is not a requirement. Additionally, the KSA-150 should only be operated with the power cord supplied with the unit. Use of other power cords may damage the amplifier and void its warranty. The KSA-250 requires a dedicated 20-amp line. It too, should only be operated with the power cord supplied with the unit.

Please consult Krell or your dealer before using any devices designed to alter or stabilize the AC power for the KSA-150 or KSA-250.

C.UNPACKING

Remove the unit, power cord and accessories from the shipping container. Store all packing materials in a cool, dry place for future use. Inspect the unit for shipping damage. If any damage is evident, contact your dealer immediately. If the unit is in proper condition, proceed with the installation.

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Contents Introduction Table of ContentsGeneral Information Unpacking Power ConsiderationsInstallation Unit Location GuidelinesConnection of Inputs and Speakers Operation Protection Circuitry Important Notes Regarding Protection Circuitry Warranty and Service Information

KSA 150 / 250 specifications

Krell Industries has long been a leader in high-end audio equipment, and their KSA 150 and KSA 250 amplifiers exemplify this commitment to excellence. Both models are celebrated for their exceptional performance, build quality, and innovative technologies, aimed at delivering pure, accurate sound reproduction.

The KSA 150 and KSA 250 feature a unique class A design, which is fundamental to their sonic performance. Class A amplification is known for its low distortion and high linearity, allowing these amplifiers to deliver a clear and dynamic audio experience. The KSA 150 provides an output power of 150 watts per channel into 8 ohms, while the KSA 250 ups the ante with 250 watts per channel into 8 ohms, making them suitable for even the most demanding speakers.

One of the standout characteristics of these amplifiers is the robust power supply and large transformer design. The dedicated power supply ensures ample current delivery, which is crucial for maintaining control over the speaker drivers and providing the energetic dynamic range that listeners appreciate. Krell's proprietary circuitry design further enhances performance by minimizing feedback and ensuring that the amplifier maintains its integrity even at high output levels.

Both models incorporate advanced thermal management technology. With their large heat sinks and efficient cooling systems, the KSA 150 and KSA 250 can dissipate heat effectively, allowing for continuous operation without risk of overheating. This engineering not only prolongs the life of the components but also ensures consistent performance during extended listening sessions.

Another feature of the KSA series is the balanced and unbalanced input options, providing flexibility for various audio setups and ensuring compatibility with a wide range of source components. This adaptability is crucial for audiophiles who often shuffle equipment to achieve the best sound.

In terms of aesthetics, the Krell KSA amplifiers are designed with a modern yet classic appearance that complements high-end audio systems. The sturdy chassis and premium finishes reflect the attention to detail and craftsmanship synonymous with the Krell brand.

Overall, the Krell KSA 150 and KSA 250 amplifiers represent the pinnacle of audio engineering, making them a perfect choice for enthusiasts seeking top-tier sound quality and performance. Whether for home theater or high-fidelity listening, these amplifiers deliver an unparalleled audio experience that continues to impress both critics and consumers alike.
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