Krell Industries KSA 150 / 250 owner manual Installation, Unit Location Guidelines

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D.INSTALLATION

1.CAUTIONS: These are important points of which you should always be aware.

∙Do not connect the power cord into the AC mains before completing the entire installation.

∙The unit must always be turned off while making connections.

∙Krell XLR and custom RCA connectors are made to very exacting standards. Connectors of lesser quality may damage the amplifiers or cause poor connections. Please check with your dealer or Krell about the use of any other connectors.

2.UNIT LOCATION GUIDELINES

With the power cord disconnected from the AC mains, lay out the pre-amp to power amplifier interconnect and speaker cables to best determine the placement for the amplifier. As mentioned earlier, the KSA-150 operates at its peak with a dedicated 20-amp line and the KSA-250 requires a dedicated 20- amp line. Consult a licensed electrician for installation of a dedicated line.

Amplifiers dissipate in heat much of the power they consume. The KSA-150 or KSA-250 must be installed in a location that provides unobstructed ventilation. If the units will be installed on shelving or in a cabinet, extra ventilation is necessary. This can be accomplished with the use of ‘whisper’-type fans in a variety of ways. Consult your dealer for assistance. Generally, with the front and rear of the installation shelving or cabinetry open, 8 inches of clearance on the sides and top of the amplifies should provide adequate ventilation.

The dimensions of the KSA-150 are: 19” wide X 16.75” deep x 8.5” high. Add 2.5” of depth for front and rear handles. The unit weighs 90 pounds. Shipping weight is 105 pounds. The dimensions of the KSA-250 are: 19” wide x 21.5” deep x 8.5” high. Add 2.5” of depth for front and rear handles. The unit weighs 140 pounds. Shipping weight is 144 pounds.

3. CONNECTION OF INPUTS AND SPEAKERS

Note: The KSA-250’s AC power cord may be connected to the amplifier at this time, but do not yet connect the power cord to the AC mains.

The KSA-150 and KSA-250 have both balanced and single -ended inputs. The balanced inputs use 3-pin XLR connectors and single -ended inputs use RCA connectors. The pin assignments for the XLRS are: pin 1 = signal ground: pin 2 = non-inverting input: pin 3 = inverting input. The RCA connector is wired in parallel with pin 2, the non-inverted input. Only one of these inputs should be connected to the preamplifier.

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Contents Table of Contents IntroductionGeneral Information Power Considerations UnpackingUnit Location Guidelines InstallationConnection of Inputs and Speakers Operation Protection Circuitry Warranty and Service Information Important Notes Regarding Protection Circuitry

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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